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From: Robbie Hatley on 15 Jul 2010 13:49

Greetings, group. I'm trying to identify a surface mount device on some
boards I'm repairing, but not having much luck.

The device is a small black plastic rectangular surface-mount device,
about 1.5mm x 2.5mm in size.

The pins are in a 5-pin DIP arrangement (basically a 6-pin DIP with pin 5
missing, leaving just pins 1,2,3,4,6).

The markings on the device include "T1|3", where I'm assuming the third
character is a vertical bar, though it's possible it might be an upper-case
letter "i", or a lower-case letter "L". There's a band on the pins 1/6 end,
and 3 small square marks near pins 2,3,5.

I'm assuming this is some sort of IC rather than a discrete component,
because the board manufacturer has designated it "U22" (rather than,
say, "Q22" or "D22").

Functionally, it seems to be processing a signal and feeding it into
the input side of an optoisolator, which then gets fed to a microprocessor.

Any clues on what this is, or how to go about finding out? Searching
Google, Arrow, Mouser, Digikey have proven unfruitful. I'm stumped.

(Nope, I can't ask the board manufacturer about it; they consider that
"proprietary information". Basically I'm trying to "reverse engineer"
the board and make a partial schematic of it.)

--
Cheers,
Robbie Hatley
lonewolf [[at]] well [[dot]] com



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