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Bookings grew sequentially and resulted in a book-to-bill above 1. Turns bookings accounted for approximately 41% of shipments during the quarter. As expected Q2 GAAP gross margin was flat sequentially at 61.9%. Q2 fiscal '20 GAAP tax rate was 63.4%, and reflects a discrete $6.5 million tax provision impact resulting from finalized treasury regulations, related to the 2017 US transition tax. We expect our GAAP tax rate for the rest of fiscal year 2020 to be in the range of 13% to 17%.

Moving on to the non-GAAP results, which exclude the impact of share-based compensation, amortization of acquired intangibles, acquisition related and other non-recurring charges. Q2 non- GAAP gross margin was flat, sequentially at 62.2% as expected. And we expect our Q3 non-GAAP gross margin to decline 20 basis points to 80 basis points due to lower absorption of manufacturing overhead as we want to bring inventory down to target levels. In fiscal year 2021, we expect the non-GAAP gross margin to return to normal levels as overall demand strength is driven by our higher margin growth engines. Q2 non-GAAP operating expense was $53.8 million, slightly higher than Q1 and in line with expectations.

In Q3, we expect the non-GAAP operating expense to be flat to down 3% sequentially. Our higher new product expense is offset by lower supplemental compensation expense. While maintaining our investment in our key growth drivers, we expect our non-GAAP operating expense for fiscal year 2020 to be approximately flat or only modestly higher compared to the prior year. We expect our fiscal 2020 non-GAAP tax rates to remain in the 14% to 18% range. In Q2, cash flow from operations increased and returned to more normalized levels, at 24% of net sales, compared to 5% of net sales in Q1.

As a reminder, Q1 includes our annual disbursements for supplemental compensation. We repurchased approximately 446,000 shares or approximately $20 million during the quarter. And our stock repurchase authorization now stands at approximately $161 million. We expect to continue to use our cash to opportunistically repurchase our shares, make strategic investments and pay down our debt.

In Q2, accounts receivable decreased to 12% sequentially, due to improved shipments linearity and represented 42 days of sales, which is within our target range of 40 to 45 days. Net inventory in absolute dollars increased 2% sequentially and days of inventory increased to 129 days, which is above our target range of 90 to 100 days.

In Q3, we expect net inventory to decline in both absolute dollars and days, as we work to get inventories back in line with the target range. In summary, we were very pleased with our execution, in Q2 despite this difficult macro environment. Our growth model was stable, operating expenses were under control and cash flow generation was strong. While the recent geopolitical challenges, continues to contribute to near-term customer uncertainty, we believe our diversified customer base and end markets, along with the secular nature of our growth engine has positioned us well for the future growth.

I'll now hand the call over to Mohan.

Mohan Maheswaran -- President and Chief Executive Officer

Thank you, Emeka. Good afternoon, everyone. I will discuss our Q2 fiscal year '20 performance by end market and by product group, and then provide our outlook for Q3 of fiscal year '20. In Q2 of fiscal year '20, net revenues increased 4% over the prior quarter to $137.1 million. We posted non-GAAP gross margin of 62.2% and non-GAAP earnings per diluted share of $0.38.

In Q2 of fiscal year '20, net revenues from the industrial end market increased 24% sequentially, led by very strong growth from our LoRa business and represented 36% of revenues. Net revenues from the enterprise computing end market increased 4%, and represented 27% of revenues. Net revenues from the communications end market increased 10% over the prior quarter and represented 10% of total net revenues. Net revenues from the high end consumer market decreased 15% sequentially, driven by lower smartphone demand, and represented 27% of total net revenues. Approximately, 16% of high end consumer net revenue was attributable to mobile devices and approximately 11% was attributable to other consumer systems.

I will now discuss the performance of each of our product groups. In Q2 of fiscal year '20, net revenues from our Signal Integrity Product Group increased 10% over the prior quarter, and represented 40% of total net revenues. As expected, demand increased sequentially across the data center and the wireless space station markets, while the PON market remained soft.

In Q2 of fiscal year '20, data center demand rebounded as customer inventory levels have reduced over the last two quarters, and demand from cloud and hyperscale data center providers appears to have stabilized. In Q2, we saw strong bookings for our ClearEdge CDRs, used in 100 gigabit per second NRZ optical modules. We expect demand for our ClearEdge CDRs to continue to increase, driven by global cloud and mega data center deployments. In Q2, we are pleased with the progress of our Tri-Edge PAM4 CDR platforms, that we are now sampling to data center customers. We expect our first Tri-Edge revenues in Q4 of this fiscal year, with growth accelerating in the second half of next year. As Tri-Edge platform delivers low cost, no power and low latency performance ideal for PAM4 based optical modules.

In September, Semtech will be part of the Open Eye MSA Interop demonstration for 10 km 50 gigabit per second PAM4 links. The Open Eye MSA, which consists of 19 companies, builds on key performance advancements of PAM4 CDRs and optics to enable lower cost and lower power PAM4 optical modules. Our FiberEdge PMD platform, which complements our Tri-Edge and ClearEdge CDR platforms, also continues to gain momentum with key data center PAM4 module customers, where we have collaborated with DSP partners, targeting PAM4 optical modules. We expect to see our FiberEdge PAM4 revenues also ramp in FY '21.

In Q2 of fiscal year '20, demand from the wireless space station market increased. Semtech's market opportunity from 5G deployments is expected to triple compared to 4G due to the higher 5G volumes and additional CDR content. For the rest of FY '20, we expect 4G and 5G deployments to increase modestly with much stronger growth from 5G platforms expected in FY '21.

In Q2 of FY '20, our PON business, which is largely driven by China, remained soft due to lower China government investment in PON, and the impact of the Huawei ban. We expect this weakness to continue through the second half due mostly to the Huawei ban. Over the next few years, we do expect the PON market demand to increase driven by 10 gig PON deployments. Semtech remains the PON market leader providing highly integrated solutions for 1 gig, 2.5 gig and 10 gig PON platforms. The greater demand for higher optical data rates at the lowest power and cost is driving greater demand for Semtech's ClearEdge, Tri-Edge and FiberEdge platforms.

We expect this trend to continue, driven by the global expansion of cloud and hyperscale data centers, the global transition to 5G base stations and the acceleration of 10 gig PON. And we expect our SIP product group to benefit from these global trends over the next few years. Our broadcast video business has been very stable for the last few years. And with the acquisition of AptoVision, we are finally starting to see an opportunity to drive significant growth in this business.

As a reminder, we are focused on transitioning the Pro audio/video industry from expensive proprietary equipment to standard IP based solutions through the adoption of Software Defined Video over Ethernet. The primary market focus has been healthcare, enterprise, industrial and entertainment. Recently, we received first silicon of our SDVoE platform, which appears to be functional and we now expect to have production of silicon by the end of this year. We believe this will be a significant catalyst in the adoption of SDVoE for all Pro AV applications, as customers realize the benefits of delivering uncompressed ultra high definition 4K TV content over a standard 10 gig Ethernet network. We will update you on the progress of our AptoVision platform on future earnings calls.

For Q3 of FY '20, we expect net revenues from our Signal Integrity Product Group to be flat to up modestly. As global demand increases, we'll be offset by the Huawei ban. Moving on to our Protection Product Group. In Q2 of fiscal year '20, net revenues from our Protection Product Group grew 4% over the prior quarter, and represented 29% of total net revenues. Our Protection business growth was driven by increases in broad based demand from the industrial, automotive and consumer markets. In particular, we saw nice increases from our North American smartphone business and from our automotive business. These were somewhat offset by lower Korean and Chinese smartphone demand. Several of our newly released parts, such as the RClamp 3324P deliver higher performance protection for the most advanced HDMI, Ethernet and USB interfaces. The increasing proliferation of these high speed interfaces across multiple market sectors is driving our growth in demand.

In particular, the rapid adoption of these high speed interfaces in automotive systems such as infotainment in vehicle communication and advanced driver assistance systems is contributing to the growing demand for Semtech's high performance protection products. In Q3 of fiscal year '20, we expect our protection business to increase due to continued strength from the automotive and industrial segments and stronger smartphone demand from North America and from Korea.

Turning to our Wireless and Sensing Product Groups. In Q2 of fiscal year '20, net revenues from our Wireless and Sensing Product Groups were approximately flat from the prior quarter and represented 30% of total net revenues. Very strong sequential growth from our LoRa business was offset by very weak demand for our proximity sensing products due to the Huawei ban. In Q2, our LoRa enabled business grew nicely. The momentum and interest in LoRa is very strong, and we are seeing more and more IoT used cases emerge every day. LoRa is rapidly becoming acknowledged as a critical technology, low power IoT sensor networks, and we expect to see LoRa emerge as the de facto standard for low power wide area networks over the next few years.

Some of the more recent noteworthy used cases include Comcast announced its -- it has partnered with Universal Parks & Resorts to deploy LoRaWAN networks in its parks to increase operational efficiency in the park. LoRa sensors will be used to monitor temperature, monitor energy consumption and track assets across the parks. Seluxit, a leading European IoT provider has developed a LoRa smart meter and cloud platform to enable their customers to closely monitor energy usage real time. Customers using Seluxit get insight into their energy usage and consumption patterns, enabling a reduction in energy waste and reduction in energy cost that enables a more sustainable energy grid worldwide.

Axino, an European IT solutions integrator added LoRa into its smart refrigeration solutions used to track food temperature, helping customers reduce food wastage and ensuring food safety. Skysens, Turkish provider of IoT Solutions, is deploying 10,000 LoRa based sensors in its smart asset tracking solutions at Istanbul Airport. Conserv, a leading IoT solutions provider for art and museum applications has developed a smart conservation solution based on LoRa that utilizes low power sensors to provide museums with accurate, efficient and simple art health metrics in real time. Oizom, an IoT solution provider for environmental applications is leveraging LoRa using Tata Communications LoRaWAN infrastructure in India to deploy its smart agriculture solutions, enabling farmers to optimize their water usage and create smarter and more efficient farms.

And Lacuna Space in Europe announced that it has completed its first phase of testing in its mission to provide complete satellite IoT global coverage for LoRa sensors anywhere in the world, however remote. Lacuna's demonstration of LoRa constellation will be completed by the end of this year. Lacuna also demonstrated a connectivity range of over 300 miles. These are just a handful of examples of new used cases emerging in the LoRa ecosystem.

Interest in our recently announced cloud based LoRa services, which includes our LoRa based Geolocation services has been very high, as we start to demonstrate the unique value of a LoRaWAN based geolocation service offerings. We believe that customers will begin transitioning from testing our geolocation services to qualification and commercialization early next year. Based on our anticipated growth in LoRa sensors and the assured attach rates of sensor geolocation, asset tracking and other services, we expect our LoRa Cloud services to grow to $100 million in recurring revenues within the next five years.

Our LoRa momentum continues to build nicely and we are seeing very exciting momentum across the globe underscored by the key LoRa metrics we track. Our key metrics update includes the number of public or private LoRa network operators increased in Q2 to approximately 120 from 100 at the end of FY '19. We expect 130 LoRa network operators by the end of fiscal year '20.

The number of countries with LoRa networks grew to more than 82 countries. By the end of FY '20, we expect over 90 countries to have LoRa networks. The estimated number of LoRa gateways deployed increased to more than 350,000. These gateways will support approximately 1.5 billion connected end nodes. We expect the number of LoRa gateways deployed to exceed 500,000 by the end of FY '20, supporting LoRa end node capacity of over 2 billion end nodes.

The cumulative number of LoRa end nodes deployed increased to $105 million. We now expect this number to reach $130 million by the end of FY '20. The LoRa opportunity pipeline is now over $475 million, with an additional $200 million of leads feeding the opportunity pipeline.

We anticipate that on average, 40% to 50% of this pipeline will convert to full deployment over a 24 month timeline. Our pipeline of opportunities is geographically well balanced and also includes a growing number of consumer used cases where the volumes could be significantly higher. We will continue to provide LoRa metric updates on future earnings calls. In FY '20, given the slower than expected start to the year, driven by extremely soft demand from China, we are now expecting our LoRa enabled revenues to come in between $18 million and $100 million. We expect to exit the year at a quarterly run rate closer to the high end of this updated range.

We still anticipate a 40% CAGR over the next five years and we continue to expect LoRa to become the de facto standard for LPWAN used cases over the next few years, in what we expect to be a multi-billion unit industry. In Q2 of fiscal year '20, demand for our proximity sensing platforms decreased as expected, driven by lower China smartphone demand, due to the Huawei ban. While our Huawei smartphone business will continue to be a challenge, we believe our proximity sensing business will benefit from increasingly stringent global SAR regulations as governments recognize the health risks associated with increasingly powerful 5G radios.

Over the next few years, we expect the majority of smartphones and wearable devices to have soft sensors included in their system designs. For Q3 of fiscal year '20, we expect net revenues from our wireless and sensing product group to increase due to stronger LoRa enabled demand. Moving onto new products and design wins. In Q2 of fiscal year '20, we released 12 new products and achieved a record 2,460 new design wins.

Now, let me discuss our outlook for the third quarter of fiscal year '20. We are currently estimating Q3 net revenues to be between $135 million and $145 million. To attain the midpoint of our guidance range, or approximately $140 million, we needed net term orders of approximately 36% at the beginning of Q3. We expect our Q3 non-GAAP earnings to be between $0.38 and $0.42 per diluted share. Our Q3 guidance assumes no further direct shipments to Huawei in this fiscal quarter.

I will now hand the call back to the operator. And Sandy and Emeka and I will be happy to answer any questions. Operator?

Questions and Answers:

Operator

Thank you. At this time, we'll be conducting a question-and-answer session. [Operator Instructions] Cody, your line is live.

Cody Acree -- Loop Capital -- Analyst

Thank you very much for taking the question. Just a clarification on that last point. You're not shipping to Huawei this quarter, any further this quarter. Are you wearing out your Huawei expectations going forward? And are you shipping as many other companies are, any portion of your prior revenue?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah. Cody, we are shipping as Huawei requests us to ship. And of course, if we're allowed to ship. The comment is that we don't plan in our guidance to ship anything more, even though we have backlog to Huawei and that's really related to them. You know, there's an indirect impact, as they've mentioned on previous calls, where we may be able to ship a product, but if they can't get the component from another -- key component from another manufacturer, then they can't ship their system anyway. And so part of that is, our kind of approach is assuming that they're going to have difficulty in assembling all the components they need to build their systems.

Cody Acree -- Loop Capital -- Analyst

And then just the Chinese versus the Huawei implications. How have you seen the ban or the trade conflicts impact your broader Chinese activity, particularly in the smartphone market? Not necessarily PON, but just broadly, are you seeing any hesitation or are you seeing any share shifts that might give you encouragement that you could see China grow even if Huawei is not?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah. I don't think the tariff situation is so much an impact for us. I think the China demand softness is obviously an issue for everybody and that is more, you know, has been -- it was going on before the tariff situation. The tariff situation has compounded I think the uncertainty and there's some elements of that. But I don't think those really are the major impact for us. I think the Huawei ban is clearly a direct impact, and that's really the major impact. Outside that, I think we still have pretty high expectations of growth in China.

Cody Acree -- Loop Capital -- Analyst

Great. Thank you, guys.

Operator

Our next question comes from the line of Tore Sandberg with Stifel. Please proceed with your question.

Tore Sandberg -- Stifel -- Analyst

Yes, thank you. First of all, so just to close the loop on Huawei. So it's about 5% of your revenues last quarter, right? So roughly $7 million and that's going to go away in the October quarter, is that the math?

Mohan Maheswaran -- President and Chief Executive Officer

We've estimated about $10 million impact this quarter, Tore, from a direct standpoint. There may be additional indirect impact again, and we're not aware of but the direct impact for us is about $10 million.

Tore Sandberg -- Stifel -- Analyst

Very good. That's helpful. And then as we sort of look at outside of China and Huawei, I know last quarter you talked about backlog kind of firming. You know, inventories were pretty low, as you mentioned in the data center market. As we now are here 90 days later, would you say that, outside of China, the environment is still relatively healthy?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, I think that's fair. I mean, I think the smartphone market is a little bit skewed because of Huawei and Huawei's inability to ship. So we don't really know if someone else is going to pick that up or they're picking that up when we see a pick up there. So outside that, though, I do think that that rest of the market, data center for sure, IoT for sure are doing reasonably OK. So it's very segment specific and yeah I don't see any other regional issues.

Tore Sandberg -- Stifel -- Analyst

Very good. Just last question on LoRa, as cloud services start contributing to revenues perhaps early next year, is this going to be a separate line item? Or are you kind of going to talk a lot about, you know, perhaps, you know, where you're seeing the geographic implementation there?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, we'll start to get more color as we start to get the revenues from the geolocation services and as it becomes a material number, of course, we'll break it out.

Tore Sandberg -- Stifel -- Analyst

Great. Thank you very much.

Operator

Our next question comes from the line of Rich Schafer with Oppenheimer. Please proceed with your question.

Rich Schafer -- Oppenheimer -- Analyst

Yes. Thanks. I believe my first question, Mohan, is on LoRA, just kind of going back to that. You know, obviously that business continues to show really solid growth, but I think probably slower than maybe you expected or we expected sort of starting last year. So I don't know if you can spend a second, just kind of what's been the biggest surprise there versus your expectation even two or three years ago? And maybe it's as simple as just like you said, maybe it's just China slowing down kind of surprisingly here.

And then the second part of that question is, I'm just curious what we should watch for? You know, what kind of milestones on LoRa revs as we track toward, I know you guys have talked about $500 million to $1 billion in the next three to five years, that certainly implies a pretty good hockey stick at some point in the future to hit that kind of run rate. So, sort of any color there, maybe next year -- will that be hockey stick year, or just if you could frame some of that be helpful? Thank you.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah. So I think some key points is -- we've been growing at 60% a year now from a revenue standpoint and this year, our expectation was no different. Obviously, we started the year very soft with China. China is still 60% of our revenue for all of LoRa's generated out of China. But one of the key things to really look at is the opportunity pipeline. The opportunity pipeline is more balanced. I think it's going to be more geographically balanced. There's a lot more different types of used cases. So I think that's one thing to look out for. As I said in my remarks, that we're still anticipating 40% CAGR going forward for the next five years. You layer on top of that cloud services would probably generate something like a 50% CAGR. And so I think the key things to look out for still the opportunity pipeline, the conversion rate, the number of [indecipherable] deployed, which indicates, really what type of end node capacity we can support.

The end node deployments themselves. And then just general momentum, you know. And as you said, we are expecting in this pipeline of opportunity, we have some very, very good, very potentially high, more consumer-ish, more smart building, smart home kind of used cases that we think could be a real catalyst. And once we see that momentum go, I think it's going to be clearly obvious to everybody that LoRa will become the de facto standard for LPWAN. Obviously, we're still working hard at those used cases and still a ways to go. But, we're fairly optimistic about them.

Rich Schafer -- Oppenheimer -- Analyst

Thanks. And then just a quick follow up on the -- shifting gears to base station. I think it's around sort of a mid single digit kind of contributor to revenues. I know you talked about that business growing modestly in the back half. And I assume that's without Huawei. So is that really -- is it just a function of the higher content, as you mentioned in your prepared remarks? Is that -- is that share gain for you guys at sort of the non-Chinese wireless OEMs, you know, like the Nokia's, Ericsson's, Samsung's? Any color there would be great. You guys obviously have a great relationship with Samsung, for instance, on the handset side. So I don't know if that was a better opportunity for you guys.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, it's a bit of everything you mentioned, Rick. I think we are generally seeing a pickup in demand because of 5G deployments. I wouldn't say it's huge. I would say it's very modest, but it is a pickup. Obviously, Huawei is a, you know, a bit of a headwind for us on that. But I think as with smartphones, we do expect over time someone else to pick up the demand that Huawei can't ship. So, we'll see how that plays out but that's our expectation.

Rich Schafer -- Oppenheimer -- Analyst

Thanks.

Operator

Our next question comes from the line of Craig Ellis with B. Riley FBR. Proceed with your question.

Craig Ellis -- B Riley -- Analyst

Yeah, thanks for taking the question. And just to make sure I'm clear on the Huawei effect, are you saying that there was $10 million of Huawei revenue in the fiscal second quarter, but you don't expect there to be any so that's the $10 million sequential headwind?

Mohan Maheswaran -- President and Chief Executive Officer

Yes, we've shipped some already, Craig, but we're not expecting to ship any more. And so the total impact is about $10 million for us.

Craig Ellis -- B Riley -- Analyst

Got it. And then following up on some of the LoRa questions to Mohan. So it seems as I look at the performance of the business versus target, you're actually tracking in network operators and countries potentially to exceed the targets that you had set at the beginning of the year. And yet we did reduce that end node target from $140 million to $130 million, I believe. And then you updated the revenue target. But if I look at that data, it would seem to suggest that the business is getting good traction outside of China, but maybe not getting the end node deployments as fast as we had thought perhaps three and six months ago. Is that a fair depiction or is there really something else going on?

Mohan Maheswaran -- President and Chief Executive Officer

No, I think that's a fair depiction. Craig. I think the only thing to remember is that, predicting end node deployments is really predicting how fast the opportunities turn into -- and the proof of concepts turn into revenue, I mean, the actual deployments. And so it really is a estimate right now. As we look at it, at the moment, LoRa is still a small business and it's still a sub-$100 million business. And so, a small change like China, softness in smart metering, for example, can impact that. But I think as the business starts to scale and gets larger and as I mentioned, and the opportunity pipeline being more balanced then those small changes, I think won't have such a significant impact. And that's when we look at the opportunity pipeline being so large, if we can convert those, we're going to see the 40% or more CAGR that we're projecting.

Craig Ellis -- B Riley -- Analyst

Okay, that's helpful. And then switching over to Signal Integrity. So it seems like the company is pleased with the momentum it has with the ClearEdge parts and the Tri-Edge PAM4 parts, I think were specific that we'd start to see revenues for some of these PAM4 parts in the fourth quarter. But then really more again in the second half of calendar '20, is the point there that seasonally we would expect the business to be stopped there in the first half of the year, just given enterprise and data center spending or is there something else going on? And should we expect a similar revenue and demand profile for your ClearEdge parts?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, I think it's more related to when the market is ready for PAM4. I think we see customers interested. We see design and activity, but revenue, I think is still toward the back end of next year. And, we are working very closely with them, obviously, as we bring out our products and we see momentum that may change maybe a first half phenomenon. But I think at this point in time, we project more second half next year revenue.

Craig Ellis -- B Riley -- Analyst

Okay, that's helpful. Last one is for Emeka. Emeka, I haven't forgotten about you. The guidance on gross margin was helpful as it relates to the fiscal '21 color, racing back toward more normal levels. The question is, what is 'normal' would that be the 61% to 62% range or is that 62% plus? And I take it that's driven by valuation, but would there be any micro services revenue included in that guidance? Thank you.

Emeka Chukwu -- Chief Financial Officer

I think the normal levels that I'm responding to, if you look at for the last several quarters, we've been about 62% and above. So that's what I sort of consider as normal for us. Now, I would expect that as we go into the next fiscal year, and as we look at where we expect to get our growth from, getting growth from LoRa, getting growth from hyperscale data center, getting growth from Pro AV products, from the industrial protection products. These are all end markets that we know come with much higher gross margin expectations. So that is why I do have to believe that as we get into the next fiscal year and especially also as demand overall strength and size faster come back to normal levels, we can get back to the same levels of manufacturing activity. So those are the reasons why I do believe that we should get back to the normalized levels of 62% and above.

Craig Ellis -- B Riley -- Analyst

Thank you for the color.

Operator

Our next question comes from the line of Tristan Gerra with Baird. Proceed with your question.

Tristan Gerra -- Baird -- Analyst

Hi, good afternoon. When you mentioned 5G content opportunity to triple, could you give us some color on how does that translate in dollars in terms of 5G content per base station and also the pace of increase that you expect for next year?

Mohan Maheswaran -- President and Chief Executive Officer

Yes, Tristan. I think it's difficult to say, everybody's -- it depends on the architecture. How many front or back or middle links are in each system deployment. What we are seeing, obviously, is that there's more demand for CDR and so that increase in content is obviously beneficial to us. Also, 5G architecture in general requires more base stations and so we are just seeing, you know, at least that customers are telling us that's likely to be the case. So there'll be more base stations, different types of base stations and more CDRs and so that drives the content. We're already starting to see a modest pickup, as I mentioned. I think next year, again, we'll see if it plays out in the first half. I think it's more like in the second half, but there is definitely a pull from the market. So I think the need is there. And it's just now a question of whether the technology is ready and whether the customers are ready to -- service providers are ready to put the money in. So I think it's going to happen starting next year.

Tristan Gerra -- Baird -- Analyst

Okay. And then moving on to the impact of 5G, but this time on the consumer side. Does your protection business potentially benefit from the ways of 5G phones? Are there any changes that you expect in the regulatory environment for 5G modem power in phone that would have an impact on on your content per cellphone?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, the main shift would be on, what we expect our proximity sensing, as I mentioned in the call, that 5G radios are pretty powerful. And as you have more 5G radios -- because of the range, you need to have a increase in power to get to more distance as you have a higher bandwidth there. Typically, those radios are going to be more powerful and therefore I think potentially more dangerous. And I think one of the things we expect is most phones, whereas the attach rate today of proximity sensing for SAR functionality is fairly, you know, not so high. I think for 5G phones, it's going to be much higher. And so that's really a good opportunity for us.

In addition, for protection. So that's for proximity sensing and from a protection standpoint, we see the same type of improvements required, high speed interfaces, more advanced processes, different displays requiring protection. And it's just a more challenging environment as everything is faster and more -- has more advanced lithography, so more advanced displays. So, again, protection and proximity sensing, we expect to do quite well going forward due to 5G also.

Tristan Gerra -- Baird -- Analyst

Great. And then last one, in terms of the growth for LoRa that you see for this year. How should we model China? I thought China would have decline as a percentage of total LoRa revenue. Do you actually expect China to be flat to up year-over-year this year? Or is the new target embedding China to be down year-over-year?

Mohan Maheswaran -- President and Chief Executive Officer

I would think that China would be maybe slightly up year-over-year, Tristan but I think we did anticipate it would be a much higher growth this year to be fair, as we planned over the year, a lot of the growth we did expect from China. But I make the comment on the opportunities being more balanced just for that reason. We just don't know where this whole tariff thing is going to lead to and those type of things. And, you know, one of the things we pride ourselves on is having geographical balance and end market balance. And this is one of the reasons, it's that we can't predict what's going to happen regionally. All we know is we have very good momentum also in North America. We have very good momentum in Europe. But yeah, for this year, the projection was that China would be growing faster and I think it's going to be fairly muted growth.

Tristan Gerra -- Baird -- Analyst

Okay, great. Very useful. Thank you.

Operator

Our next question comes from line of Karl Ackerman with Cowen and Company. Proceed with your question.

Karl Ackerman -- Cowen and Company -- Analyst

Hey, good afternoon. Emeka or Mohan, your comments on China PON demand largely echo peers who have reported already. But I think you sound a little bit more optimistic on 100 gig optical components than peers. So what are you seeing here in terms of bookings for 100 gigs for the second half of the year? And, how should we think about the opportunity for your PON business as 5G ramps later this year?

Mohan Maheswaran -- President and Chief Executive Officer

Karl, I think the -- so separate PON from data center. So there's really two markets we're playing. PON is the one that's majority China, mostly China driven, mostly today 2.5 gig and 1 gig PON. We are seeing growth in 10 gig deployments. The challenge for us with PON is that, Huawei has really been one of the key drivers of that business in China and obviously with the Huawei ban that puts some challenges around that business. In addition to that, China has been the main region for PON deployments. There are other regions deploying, but China has been the -- by far the highest volume. And so you combine the slightly modest investments in -- reduction in investments by the China government in PON and then combine that with Huawei ban that puts really a headwind on PON business.

Now, separate that from the data center business. The data center business we've talked about inventory builds in Q4 and Q1. We started to see that free up now in Q2, started to get more balanced and we expect the rest of this year to be a little bit better for data center and most of those 100 gig, 4x25 gig and IC optical module deployments. And so that's where we see the benefit there on our CDRs.

Karl Ackerman -- Cowen and Company -- Analyst

Understood. My last question, if I may. Could you elaborate on what you expect from the proximity sensing business for the back half of the calendar 2019? I understand that Huawei is an overhang, but I guess I was under the impression that business outside of smartphone should grow at kind of a high teens or, plus or minus clip. So could you may elaborate a bit more on what you're seeing in that market outside of Huawei/smartphone? That would be helpful. Thank you.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, the proximity sensing business is doing quite well outside China. It's also obviously Korea, so it's mostly today, it's mostly smartphones, even though we're getting design wins in wearables and other areas where the radio is touching the human body. But I think today the most, majority of the volume is still smartphones. And obviously, as you know, the big smartphone manufacturers that the major volume drivers are in Korea and handful in North America and then China. And we've done a really actually a phenomenal job of diversifying this business. It used to be all Korea driven. But China this year, obviously, because of Huawei who were the main drivers of our proximity sensor business in China have had challenges.

And so now in the back half, we're expecting Samsung to pick up a little bit. They haven't had a strong year-to-date. I think there's indications that they may do better. And as I mentioned, that I think it's likely that if Huawei can't ship phones outside China, that someone will pick up that demand. Not clear who it will be, but we do expect that demand to benefit us in some shape or form and in the proximity sensing world.

Karl Ackerman -- Cowen and Company -- Analyst

Thank you.

Operator

Our next question comes from line of Harsh Kumar with Piper Jaffray. Proceed with your question.

Harsh Kumar -- Piper Jaffray -- Analyst

Yeah. Hey, guys. Couple of questions. You guys called out Mohan and Emeka, you called out LoRa and data center for growth. LoRa historically has been highly China dependent. But you saw some pretty strong growth in this July quarter you reported. I'm curious if this growth that just came in, in the July quarter. Did it come from China or did it come from other places? And then on data center, I was curious, similar sort of geographic based question. Are you seeing growth from data centers in US and Europe and not from China? And further, maybe you could clarify between cloud enterprise or hyperscale?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah. So let's start with that first question and the last question first, Harsh. So data center is clearly being driven today, mostly out of North America. You know, the shipments might be -- we might be shipping into China because the supply chain is there. But the end demand is to service North America. So that's without question is the answer to that and it's mostly hyperscale data centers today, I'd say a mix of cloud as well, but for mostly hyperscale data centers. And then on the LoRa side, yes it's China, I'd say a large chunk of that growth is China, but it's also rest of the world. You know, as you know, Q1, we had a pretty weak LoRa business and that was driven mostly by China's softness. And I think we saw a little bit of a pickup from that in Q2. But I would say it's more balanced, but still yet a lot of the growth is driven by China.

Harsh Kumar -- Piper Jaffray -- Analyst

Got it. And then would you say that some of the other companies, Mohan that have reported -- actually a lot of them already reported the June numbers and even July. Most of them have said that China had bottomed out, ex-Huawei of course. Would you say that you would share that sentiment for your business?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, I would say that's probably true, Harsh, although Huawei is a fairly significant influencer in the region. And so I think if you exclude them, then you have to look at the whole ecosystem around them. But I think outside that, yeah I do think that China seems to be doing better now. You know, as I mentioned, you know, there are indications that the China demand as a total is now starting to do better outside the tariff uncertainty, which doesn't really impact our demand so much. I think it's just the uncertainty of it kind of creeps up over shadowing nervousness. But I think outside that I think China demand seems to be doing better.

Harsh Kumar -- Piper Jaffray -- Analyst

Great. Thanks. That's all I had.

Operator

Our next question comes from line of Gary Mobley with Wells Fargo. Please proceed with your question.

Gary Mobley -- Wells Fargo Securities, LLC. -- Analyst

Hey, guys. To start with a quick question for Emeka on the opex. So your Q3 opex guide implies a $2 million year-over-year decrease. And just to get to the question of sustainability for that lower level, is there anything more than just lower bonus accruals or putting the cap on any sort of travel expenses, what not?

Emeka Chukwu -- Chief Financial Officer

No, there's not that much more to it, I think as you can imagine coming into the year, we actually had much better expectations for the current year. So our bonus programs were very much aligned to those, but unfortunately we're not seeing those and so we don't expect the programs to pay out as much as we had anticipated. And overall, you know, managing operating expenses is something that we do very well. We probably still have about 20% to 25% of operating expense as a variable, you know. So those are opportunities for us to keep things in control. So there isn't anything, you know, that it's a [indecipherable] that we are doing you know to manage our operating expenses.

Gary Mobley -- Wells Fargo Securities, LLC. -- Analyst

Kind of a add question. So one things this Huawei should be banned in the US-China trade issues has taught China companies is try to accelerate their, and reduce their dependence on Western chip companies. So as you sit here today driving 35% of revenue from China. Have you seen any sort of anti-US sentiment as it relates to design win activity or maybe even adoption of what LoRa which may be viewed as the US based technology?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, actually, it's a really good question. I think we have seen that, but I think that's nothing unusual. I mean, that was going on before tariff situation. The Chinese have been driving a whole kind of vision of having more component suppliers in the region. Fortunately for us, most of the stuff we do is really high end stuff. And I think, they are challenged, I mean, the companies that were challenged to do, kind of achieve their levels of performance we achieve.

Now, that said, you know, because of some of the situations we have, like the Huawei ban, we may drive the customers -- the end customers to actually change their specifications to accommodate a poor performing devices. And so, we have to be faced with that. I think that's just one of the side challenges we have to deal with in addition to being faced with Chinese competition as customers may be changing their specs to accommodate lower performing devices.

That said, I think that for us, we have enough opportunity across both China and the rest of Asia and other regions of the world to still expand our SAM and our opportunity.

Gary Mobley -- Wells Fargo Securities, LLC. -- Analyst

Okay, I appreciate that. Thanks, guys.

Operator

Our next question comes the line of Quinn Bolton with Needham and Company. Proceed with your question.

Quinn Bolton -- Needham and Company -- Analyst

Hi, guys. Wanted to ask first on the data center business. With a nice uptick that you saw in the second quarter and the guidance for continued growth into the second half of the calendar year. Do you think you're now sort of through all of the inventory correction or do you think even in the second half you may still be shipping under end consumption of optical modules in the data centers?

Mohan Maheswaran -- President and Chief Executive Officer

Quinn, we think most of the inventory has now gone through. I mean, I think it's been two quarters now where we've seen softness in data centers, difficult to call it. It's not a huge increase we're seeing, but we are seeing modest increase. And so our feeling is, yeah, in the second half there's going to be a little bit stronger. So I think the assumption from that is that inventory mostly is reduced.

Quinn Bolton -- Needham and Company -- Analyst

Okay, great. And then just a question on the smartphone business. I know historically the company set very high share in the OLED display protection market. I think certainly that was the case with the Korean manufacturers. But if you see Chinese manufacturers ramping OLED displays. You have the same market share with some of the newer Chinese OLED manufacturers on the protection side that you did with the Korean OLED manufacturers?

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, I think so. First of all, you know, lot of the Korean -- lot of the China phones are still using, I think, Korean displays and we will do so for quite some time. I think. And so, but yeah, we have a reasonable position. I wouldn't say it's as good as the Korean smartphone area, but you know, obviously our relationship with Samsung has always been very strong and our relationship in China is emerging I would say on the display side, but we still believe that we have a pretty good share across the globe.

Quinn Bolton -- Needham and Company -- Analyst

Got it. And my last question is just on the LoRa business. You've sort of discussed that it was a little bit of a slower start this year and the new revenue target for fiscal '20. It sure implies a low single digit to maybe a mid 20% year-on-year increase, below that 40% kind of CAGR that you expect for the next five years. Should we think that, to an extent we we get into a better economic environment in 2020 that you could rebound above that 40% level for a year? Or would you sort of encourage us to think that the best way to think about that LoRa business is that the growth rate is going to be much closer to that 40% kind of off the fiscal '20 base that you've just given us?

Mohan Maheswaran -- President and Chief Executive Officer

The way I would think about it, Quinn, so, we have been growing at 60%, right. So that was our expectation coming into this year. And so we've kind of reset that to a 40% CAGR. But as I mentioned, one of the things I've mentioned is that -- we are expecting a major catalyst or two over the next 12, 18 months here that I think will drive much faster growth. And obviously, when that happens, then we can talk about what that does for the numbers. But it's still a ways off we still have to execute on it. We still need our customers, you know, to go through the POC process and demonstrate the value and then indicate to us that that's something that they're going to do and that's going to drive a lot of volume. So for now, I think the 40% is a good number to model in.

Quinn Bolton -- Needham and Company -- Analyst

Great. Thank you Mohan.

Operator

Our next question comes from the line of Scott Searle with Roth Capital. Proceed with your question.

Scott Searle -- Roth Capital -- Analyst

Hey, good afternoon, thanks for taking my question. Quick clarification on the guidance. I just want to make sure I was clear. Proximity sensors, you're expecting to be down sequentially, but overall, the Wireless and Sensing group is expected to increase into the third quarter. Is that correct?

Mohan Maheswaran -- President and Chief Executive Officer

That's correct.

Scott Searle -- Roth Capital -- Analyst

Okay. So just to follow up, Samsung has historically been a slightly larger customer for you I think in the last several quarters have been running, $10 million to $14 million, was it little bit softer this quarter. It sounds like proximity sensing was part of the issue there, but is there something else going on? Is there a share loss or something else? We're just clearing some inventory here before you expect that demand to come back to a more normalized level?

Mohan Maheswaran -- President and Chief Executive Officer

You're talking about. You're referring to Samsung cellphone business?

Scott Searle -- Roth Capital -- Analyst

Yes.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah Samsung just hasn't been as strong for us in the first half. I think, you know, I think we're anticipating a little bit stronger Q3 from them. But in the first half, you know, as they told us their demand hasn't been as strong as they had anticipated. And I think that's part of the thing we're looking at, is whether they're going to be able to pick up some of the China smartphone demand from Huawei. But, yeah, I think maybe it's been because, you know, they have business in China and Asia and Huawei set to become more aggressive in those regions. But I don't know really the China smartphone, Korea, sorry, Korea smartphone has been weak for us in the first half. We are expecting that to come back a little bit in Q3.

Scott Searle -- Roth Capital -- Analyst

Got you. And to follow up on a couple of earlier questions around data center. Nice snapback in the second quarter. Sounds like you're continuing to look for a sequential increase into the third quarter. China had been expected to be a component of internal or domestic demand in consumption for new data centers being built out in the Chinese mainland. Is that still part of your outlook going forward to see that kind of growth in that coming back? Or is this recovery and sustained recovery still all being built from North America hyperscale cloud environments?

Mohan Maheswaran -- President and Chief Executive Officer

No, China is included in that and just not Huawei. So I think we include other China customers. Yeah.

Scott Searle -- Roth Capital -- Analyst

Okay. And lastly, just to wrap up on LoRa, as you exit the fourth quarter, more than $100 million type run rate on China has been a big component of that. What is your expectation of what China as a component of that $25 million in the fourth quarter? And then just to follow up on your earlier comment, you're expecting a big catalyst on the lower front to drive growth. I wonder if you could expand upon that a little bit. Give us a little bit of color. Is that tags or is it something else? Thank you.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah. So, you know, as we end the -- exit the year, Scott, you know, I still think China will be about 60% of their revenue. And, you know, it's really the pipeline is a lot more balanced. But I think we have to see evidence of that. You know, the other regions and LoRa in those other locations turning into revenue before we can change, move the shift, change the shift in revenue profile geographically. And it doesn't usually change that quickly. So, you know, China may go from 60% to 58% or 55% or something like that until we see a big catalyst.

The catalysts are many. I mean, I think there is not one. I think there are a lot of consumer-ish type used cases, tags and things related to devices and also on smart home. But they just have a higher volume than the industrial smart metering, smart city, smart building kind of used cases. And so that's what we're referring to. And what that will do really for LoRa is move it from being kind of a industrial IoT sensor to being a true IoT for many different segments, including consumer and industrial and enterprise. And that's what we're looking for, that type of catalyst.

Scott Searle -- Roth Capital -- Analyst

Great. Thank you.

Operator

Our next question comes from the line of Hamed Khorsand with BWS Financial. Proceed with your question.

Hamed Khorsand -- BWS Financial -- Analyst

Hi, just a couple of questions here on LoRa. Outside of China, are you seeing any pricing pressure that's creating this issue with revenue not growing this fast to offset the weakness in China?

Mohan Maheswaran -- President and Chief Executive Officer

No, Hamed. We don't see any pricing pressure really. I think it's more just a conversion of POCs. We are seeing momentum in other regions. It's just faster revenue in China. China, one of the reasons why China has been more rapid adopter of LoRa and generating revenue faster is they typically have access to more system integrator, software engineers, hardware engineers, sensor developers in the region. And they tend to be very, very fast, solving bottlenecks and providing solution to issues. That takes us -- it's a little bit more challenging in Europe and North America and other regions. But it's starting to -- starting to get there.

Hamed Khorsand -- BWS Financial -- Analyst

And how much of a factor is the slowdown in the automotive industry playing a role in your production business?

Mohan Maheswaran -- President and Chief Executive Officer

Not really impacting our protection business at all, Hamed. I think our protection business is mostly today driven by smartphones, and then the automotive is growing quite nicely for us. It's relatively new segment for our protection business, as I mentioned in my script. We're seeing a lot of infotainment and aid apps, and new applications emerge in the vehicle that all need very high end protection because they have advanced lithographies in them. And so our protection business is growing nicely now in that space. So, yeah, but it's small, it's small for us today.

Hamed Khorsand -- BWS Financial -- Analyst

Okay. Thank you.

Operator

Our final question comes from the line of Craig Ellis with B. Riley FBR. Proceed with your question.

Craig Ellis -- B Riley FBR -- Analyst

Thanks for taking the follow up question. Team, I just wanted to follow up and see if I could ask a question about how you would look at the fiscal fourth quarter seasonality in this environment? Given all of the macro crosscurrents, it's hard to think of any quarter seasonality but to the extent that you have a view there, can you at least share some of the positives and negatives that you would see from this early juncture. I'd appreciate the color. Thank you.

Mohan Maheswaran -- President and Chief Executive Officer

Yeah, it's tough to call, Craig mostly because of Huawei, I would say. I think, we would expect Samsung to be down obviously in Q4. But they haven't had a great year. So normally when they've had a fairly modest year, sometimes their Q4 is not as extreme downward. So that maybe weak, I think data center will continue to be quite strong. Obviously, we expect LoRa and IoT to be quite strong. So it's going to be tough to call it. I think we'll just have to wait and see how China plays out. The Huawei ban is the one thing that obviously does impact us. We'd expect a similar type of impact in Q4, unfortunately. So we'd have to look at that. But my sense is, you know, Q4 could be better than we normally would see it.

Craig Ellis -- B Riley -- Analyst

You mean just at the margin there's a headwind or you mean there could be an incremental $10 million headwind in the fiscal fourth quarter, Mohan?

Mohan Maheswaran -- President and Chief Executive Officer

I think the $10 million we have is -- would be included in the numbers. So if you take Q3 run rate, I would anticipate normal seasonality from that standpoint. And then you look at my comment on Korea. So, Q4 could be stronger than we have seen in the past in terms of the -- typically it's down for us at least 5%. I would say probably it's not going to be down as much, but we'll see.

Craig Ellis -- B Riley -- Analyst

Got it. Thank you for that.

Operator

We have reached the end of our question-and-answer session. And I would like to turn the call back over to Mohan Maheswaran for any closing remarks.

Mohan Maheswaran -- President and Chief Executive Officer

In closing, despite the ongoing uncertainty and geopolitical headwinds that contributed to a slower first half. And despite the ongoing Huawei ban, we are seeing modest signs of recovery in several of our targeted markets. We remain confident in the underlying strength of the secular drivers behind our growth engines, in the IoT, data center, and mobile markets. And we remain confident that our overall end market, geographical and product balance will enable us to outperform the industry.

With that, we appreciate your continued support of Semtech and look forward to updating you all next quarter. Thank you.

Operator

[Operator Closing Remarks]

Duration: 64 minutes

Call participants:

Sandy Harrison -- Director of Investor Relations

Emeka Chukwu -- Chief Financial Officer

Mohan Maheswaran -- President and Chief Executive Officer

Cody Acree -- Loop Capital -- Analyst

Tore Sandberg -- Stifel -- Analyst

Rich Schafer -- Oppenheimer -- Analyst

Craig Ellis -- B Riley -- Analyst

Tristan Gerra -- Baird -- Analyst

Karl Ackerman -- Cowen and Company -- Analyst

Harsh Kumar -- Piper Jaffray -- Analyst

Gary Mobley -- Wells Fargo Securities, LLC. -- Analyst

Quinn Bolton -- Needham and Company -- Analyst

Scott Searle -- Roth Capital -- Analyst

Hamed Khorsand -- BWS Financial -- Analyst

Craig Ellis -- B Riley FBR -- Analyst

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