How do I identify this IC?

M

melissasue5184

New Member

• Mar 30, 2016

• #1

I have tried everything to identify this chip and I've had no luck..... This PCB came out of an electronic controlled skylight blind. I am trying to identify the IC in the middle of the board. It is a 20 pin PLCC package.

 

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T

tronitech

Active Member

• Mar 30, 2016

• #2

I suspect due to the lack of responses and my inability to track down this chip that it may be a custom made chip?

 

B

bountyhunter

Well-Known Member

• Mar 30, 2016

• #3

Not a vendor I ever heard of.

"97 48" is the date code. Maybe you could contact the maker of the blinds?

 

MikeMl

Well-Known Member

Most Helpful Member

• Mar 30, 2016

• #4

tronitech said:

I suspect due to the lack of responses and my inability to track down this chip that it may be a custom made chip?

Click to expand...

It may also be a "house numbered" part. Some companies play that stupid game, primarily to make it hard to reverse engineer their stuff.

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Mar 31, 2016

• #5

I think the two DI 9952's are Dual fets one N and one P... So the chip is more likley to be a bridge driver.. The only people I know do 20 pin full bridge drivers are Allegro.... BUT!!! not in this package..

 

fezder

Well-Known Member

• Mar 31, 2016

• #6

It's annoying, first you either find IC that has markings severed off, OR then these jungle ic's -_-

 

K

kubeek

Well-Known Member

Most Helpful Member

• Mar 31, 2016

• #7

It could be some programmable logic device like GAL or PAL, in which case you can´t replace it without having the code even if you find out which exact device it is.

 

V

vtech

Active Member

• Mar 31, 2016

• #8

Looks to be a rather old/obsolete series of the discrete-to digital sensor/ selector manufactured by HOLT Integrated Circuits.
A Custom made manufacturer known for various robust semiconductor devices.
They publishes some of their data and use the exact numbering nomenclature stamping.
As far as any info, short of it's original schematic, it can be filed under Unobtainium category.