Finding genuine UPC1237?

[HighTec]

NEC / Renesas UPC1237 are dead as a Dodo. Maybe Renesas parts are still circling around mostly on ebay, Ali and in some God forsaken shops around the globe.
Look for example this ebay seller. He sold 115 pieces. I don't see anyone complaining. UPC1237 on eBay

 

[ultra]

Non original 1237s will usually have a bit higher threshold voltage on pin 4

 

[thimios]

I have seen a Nad service manual where is an alternative discrete parts circuit instead of upc.
I think that is the most suitable solution if you are looking for a upc1237.
Just need someone drown a pcb for this circuit.

 

[Nisbeth]

Do you have a link to the circuit?

 

[thimios]

I will try to find on my p.c this afternoon.
I have posted this somewhere in this forum toohttps://www.diyaudio.com/community/threads/speaker-protection-board.377896/page-9#post-7170857

 

[Nisbeth]

Thanks all for your replies. I've built up a cheap speaker protection kit as a testbed for ICs and have at least one batch of my previous purchases that seem to work OK 🙂

 

[Bill_P]

I will try to find on my p.c this afternoon.
I have posted this somewhere in this forum toohttps://www.diyaudio.com/community/threads/speaker-protection-board.377896/page-9#post-7170857

https://elektrotanya.com/nad_c-372_sm_2.pdf/download.html
see page 21

 

[Vrystaat]

The last 10 that I bought from ali-Express all work fine.

 

[JMFahey]

AliExpress has all kinds of sellers, from best to worst.
Maybe you can suggest Nisbeth the good one you used 😊
Straight via PM so it is not seen as an advertisement in the Forum.

 

[HighTec]

Good point !

 

[jan.didden]

I have some builds in progress that require UPC1237 speaker protection ICs, but how do I find genuine ones (ideally in EU)?

I have a couple of older amplifier boards that don't work and I am pretty sure the ICs I put in (from ebay/aliexpress) are the culprit. Since they are also a PITA to remove once soldered in place I would like to ensure I get genuine ICs, but I am not sure where to go as the "usual suspects" don't seem to carry these?

I have some NOS. How many do you need?
PM me.

Jan

 

[availlyrics]

I have some NOS

Can u share pics please, just to see how the genuine ones looks like

 

[jan.didden]

Data sheet has it.

Jan

 

[Nisbeth]

I have some NOS. How many do you need?
PM me.

Jan

Thanks Jan, but I think I am sorted for now.

 

[Kaibosher]

UPC1237 from Ali work fine, I've tried about 5 that came with kits, no issues.
That said, Rod Elliott's P33 is a very cool DC protection board and AC detector as it uses parts one may have lying around. Just the article itself is great education.

Speaker protection circuits are a funny things. You hope they never get activated and yet you have to trust they are working 100% all the time.

I use the P33 in my main amps. I trust in Rod almighty, all parts were from a proper distributor & it was rigorously tested and run in for hours before normal use.