Looking for a replacement for NXP/Philips TDA7052A/AT NXP 1W audio amp going obsolete...

Oct 27, 2016 12 Replies
B

This part, an 8 pin bridgable 1W audio amplifier with volume control input is going obsolete and last order date is end of this year.



When I designed it in around 10 years ago they were old then but plenty available. We will eventually need to design in a replacement.



We are running these at around 9V VCC and they work great into a small speaker. 8 Ohms I believe.



We also use the volume control input... +40 dB gain down to -60 or 80 dB gain. Doesn't require that much gain necessarily.



There is the old National/TI LM386-4 that I just now heard is going obsolete ! Dang. It looked like it was going to work.



Could go discreet with op-amp and SOT-23s but still wouldn't have the volume/gain control pin without adding a Jfet or something and would take up valuable space on one of the existing products.



Any suggestions ?



Thanks, boB K7IQ


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1 W BTL mono audio amplifier with DC volume control TDA7052A/AT
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T

I had the same problem.... switched to the SOIC8 version . You can just about solder across the dil pads as an interim solution. I guess I'll be looking for a solution too. Maybe I'll have to bulk buy. :(

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B

Thanks TT... We are going to have to do a bulk buy as well. End of 2016 is it. There are quite a few at distrubuters and I think we have almost

10,000 now but will need to substitute something. They were the perfect parts and cheap... 32 cents each. I was ready to design in the LM386-4 which has a gain control but NOW they're life is going to be short lived as well.

There's gotta be some asian part I would think ? TV sets and all that. Might all be Class D. Actually I found a Class D chip but no volume/gain control. Would have to add at least that J-FET to the circuit which isn't the end of the world BUT it takes up space.

Will stay tuned. boB

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K

How about something like:

They're expensive but something like this shouldn't be too difficult to make.

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B

I did something similar in the 1980s to replace a Valley People VCA with a THAT Corp. VCA when the VP became obsolete.

Something like this did cross my mind for a second though. Too large and not the best for production. I will tack on another part to test though. It ~may~ actually be (hopefully) that the LM386-4 (the 1 watt part) isn't going away... That is what I had heard though through the grapevine and the internet which is always true of course. Nothing official actually so there is a ray of hope, maybe. boB

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R

One would think that components like the LM386 would never go away... The are the basic building blocks of simple electronic devices, like the 555.

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G

Well a life time buy is what we would do. $0.32 is pretty cheap. There is the TCA0372 it's a dual opamp.. if that would work... you've probably already thought about it.

George H.

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T

TI do a part that's good to go class D, but Vcc is 5.2V max :( I'd have to put in another 5V reg as our TDA runs off a 2 cell lipo

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J

I think it's all class-d audio amp chips now.

They win because they are smaller.

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T

+1, they are used so widely, they're the go-to rock bottom audio amp chip. I don't see it making business sense to stop production. Only use it if you want crappy sound.

NT

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B

Luckily this 1W amplifier is only used for voice and a small speaker. A couple percent THD won't harm anything. Might even help to sound "louder" ?

boB

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