Author Topic: Help ID SMD chip from the 80's - DB 139? (Read 535 times)

gmc · « **on:** October 30, 2022, 03:24:28 pm »

I've got a PSU from a IBM 5160 I'm trying to repair. There does not seem to be schematic so I'm reverse engineering it.

The PSU has a daughter board on in which I think checks for overvoltage / excess current etc and then shuts down the PSU.

There is a SMD chip (Yes, this surprised me - the PSU is from the early 80's) with the identifiers:
DB 139
334

14 pin

The chip is manufactured by Thomson CSF

Andy Watson · « **Reply #1 on:** October 30, 2022, 04:01:34 pm »

Could they be quad comparators? AKA LM139

DavidAlfa · « **Reply #2 on:** October 30, 2022, 04:09:11 pm »

This is the most complete electronics logo list I'm aware of.
It will look like crap if using mobile, enable "Computer View".

https://how-to.fandom.com/wiki/How_to_identify_integrated_circuit_(chip)_manufacturers_by_their_logos/A-E

gmc · « **Reply #3 on:** October 30, 2022, 04:16:53 pm »

I think I've tracked it down. It's a TDB0139.
The LM139 / 339 is supposed to be the equiivalent, which is a quad comparitor.


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Author Topic: Help ID SMD chip from the 80's - DB 139? (Read 535 times)

gmc

Help ID SMD chip from the 80's - DB 139?

Andy Watson

Re: Help ID SMD chip from the 80's - DB 139?

DavidAlfa

Re: Help ID SMD chip from the 80's - DB 139?

gmc

Re: Help ID SMD chip from the 80's - DB 139?

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