What was the revenue growth rate of the base station business in the June quarter 
s Group
This is Eric. At least I can speak for the mobile business. We sell very few discrete power amplifiers or HPT solutions. The vast majority of what we are selling is combined modules that include filter and advanced switching capabilities.
So at least I haven't seen a competitive element there with the GaAs HPT supply.
Raji Gill -- Needham and Company -- Analyst
OK. And on the 5G side, there has been one competitor who basically indicated that there would be a little bit of a pause with regards to China, the build out in 5G, after a lot of deployment or a lot of orders of massive MIMO deployments. But that seems to differ from what you're saying in terms of China's ramp. Just wanted to get a sense, has there been an overbuild perhaps or is there other factors?
Bob Bruggeworth -- President and Chief Executive Officer
This is Bob, I'll go and take that. From our conversations with carriers there and what all you can see, I don't think there's been a slowdown in base stations. In fact, there's another round coming out for an even larger RFQ for additional base stations late this year, I think it's November. So we're not seeing any slowdown in the rollout on the infrastructure side.
Operator
Thank you. We will take our next question from Carl Curtis of Barclays.
Carl Curtis -- Barclays -- Analyst
Hey, guys. Maybe just on the Huawei impact of $172 million, is there any way to kind of gauge how much of that impact is IDP? I'm just trying to understand these moving pieces. I know you said the base stations had a good quarter. So I assume that in June even though you stopped shipping to Huawei partially in the quarter, that business was still up.
I'm just trying to understand. Thanks.
Bob Bruggeworth -- President and Chief Executive Officer
You can go ahead...
Eric Creviston -- President, Mobile Products Group
Yeah. In the June quarter, base stations still had nice growth year over year, well into the double-digit range. And so the other end of the question, as far as amount of revenue by business units split out, we don't split it out.
Mark Murphy -- Chief Financial Officer
We don't provide that.
Eric Creviston -- President, Mobile Products Group
Details down that level by business unit.
Carl Curtis -- Barclays -- Analyst
Got you. And then maybe I could ask you the other way, you're looking for some slight growth at mobile into September. You talked about seasonal ramps. Can you maybe give us a little more color as to where you're getting that growth? And obviously, a part of Huawei, you're offsetting there, so I'm just kind of curious if you can talk geography -- by geography or whatever color you can provide will be helpful.
Thanks.
Eric Creviston -- President, Mobile Products Group
Sure. Sure. This is Eric. The growth in mobile in September quarter is driven by normal seasonality of flagship ramps going into the second half across multiple top-tier customers.
And again, it's muted significantly then by the Huawei sequential effect.
Carl Curtis -- Barclays -- Analyst
Thanks.
Operator
Thank you. We'll take our next question from Toshiya Hari from Goldman Sachs.
Toshiya Hari -- Goldman Sachs -- Analyst
Hi, guys. Thanks for taking the question. I was hoping to better understand your September-quarter revenue guide on a year-over-year basis a little bit better. I think if we take the midpoint of your guide, your revenue is expected to be down about $130 million.
How much of that is Huawei? How much of that is your biggest customer in the U.S.? Active-Semi obviously is up. I'm assuming non-Huawei IDP is up. If you kind of walk through some of the pluses and minuses on a year-over-year basis, that will be helpful. Then I have a follow-up.
Bob Bruggeworth -- President and Chief Executive Officer
This is Bob. I'll take it on a high-level. I mean, primarily in our largest customer, we are roughly flat year over year. Huawei is the largest part and we are down a little bit in China.
If you remember last year at this time, we talked about the China market was doing extremely well and we were taking a conservative view on it, whic
s Group
This is Eric. At least I can speak for the mobile business. We sell very few discrete power amplifiers or HPT solutions. The vast majority of what we are selling is combined modules that include filter and advanced switching capabilities.
So at least I haven't seen a competitive element there with the GaAs HPT supply.
Raji Gill -- Needham and Company -- Analyst
OK. And on the 5G side, there has been one competitor who basically indicated that there would be a little bit of a pause with regards to China, the build out in 5G, after a lot of deployment or a lot of orders of massive MIMO deployments. But that seems to differ from what you're saying in terms of China's ramp. Just wanted to get a sense, has there been an overbuild perhaps or is there other factors?
Bob Bruggeworth -- President and Chief Executive Officer
This is Bob, I'll go and take that. From our conversations with carriers there and what all you can see, I don't think there's been a slowdown in base stations. In fact, there's another round coming out for an even larger RFQ for additional base stations late this year, I think it's November. So we're not seeing any slowdown in the rollout on the infrastructure side.
Operator
Thank you. We will take our next question from Carl Curtis of Barclays.
Carl Curtis -- Barclays -- Analyst
Hey, guys. Maybe just on the Huawei impact of $172 million, is there any way to kind of gauge how much of that impact is IDP? I'm just trying to understand these moving pieces. I know you said the base stations had a good quarter. So I assume that in June even though you stopped shipping to Huawei partially in the quarter, that business was still up.
I'm just trying to understand. Thanks.
Bob Bruggeworth -- President and Chief Executive Officer
You can go ahead...
Eric Creviston -- President, Mobile Products Group
Yeah. In the June quarter, base stations still had nice growth year over year, well into the double-digit range. And so the other end of the question, as far as amount of revenue by business units split out, we don't split it out.
Mark Murphy -- Chief Financial Officer
We don't provide that.
Eric Creviston -- President, Mobile Products Group
Details down that level by business unit.
Carl Curtis -- Barclays -- Analyst
 Got you. And then maybe I could ask you the other way, you're looking for some slight growth at mobile into September. You talked about seasonal ramps. Can you maybe give us a little more color as to where you're getting that growth? And obviously, a part of Huawei, you're offsetting there, so I'm just kind of curious if you can talk geography -- by geography or whatever color you can provide will be helpful.
Thanks.
Eric Creviston -- President, Mobile Products Group
Sure. Sure. This is Eric. The growth in mobile in September quarter is driven by normal seasonality of flagship ramps going into the second half across multiple top-tier customers.
And again, it's muted significantly then by the Huawei sequential effect.
Carl Curtis -- Barclays -- Analyst
Thanks.
Operator
Thank you. We'll take our next question from Toshiya Hari from Goldman Sachs.
Toshiya Hari -- Goldman Sachs -- Analyst
Hi, guys. Thanks for taking the question. I was hoping to better understand your September-quarter revenue guide on a year-over-year basis a little bit better. I think if we take the midpoint of your guide, your revenue is expected to be down about $130 million.
How much of that is Huawei? How much of that is your biggest customer in the U.S.? Active-Semi obviously is up. I'm assuming non-Huawei IDP is up. If you kind of walk through some of the pluses and minuses on a year-over-year basis, that will be helpful. Then I have a follow-up.
Bob Bruggeworth -- President and Chief Executive Officer
This is Bob. I'll take it on a high-level. I mean, primarily in our largest customer, we are roughly flat year over year. Huawei is the largest part and we are down a little bit in China.
If you remember last year at this time, we talked about the China market was doing extremely well and we were taking a conservative view on it, whic