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Unknown SM 5-pin device.

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Robbie Hatley

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Jul 15, 2010, 1:49:25 PM7/15/10
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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

Plain...@yahoo.com

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Jul 15, 2010, 2:39:30 PM7/15/10
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It's only a little help, but the package sounds like a SOT23-5.

PlainBill

Franc Zabkar

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Jul 16, 2010, 5:46:10 AM7/16/10
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On Thu, 15 Jul 2010 10:49:25 -0700, "Robbie Hatley"
<see.m...@for.my.contact.info> put finger to keyboard and composed:

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

A detailed photo of the board may help, as would a description of its
function.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

Scheini Karl

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Jul 16, 2010, 9:45:52 AM7/16/10
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On 15 Jul., 19:49, "Robbie Hatley" <see.my....@for.my.contact.info>
wrote:

> 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.

Hi Robbie,

T1 marked are at least the following 5-pin SMDs:

BD45475G http://www.datasheetcatalog.org/datasheet/rohm/bd45-46g.pdf
HD74LV1GT00ACM http://documentation.renesas.com/eng/products/logic/rej03d0115_hd74lv1gt00a.pdf
HD74LV1GT00AVS same link as above
R1121N411B http://www.ricoh.com/LSI/product_power/mark/ME-R1121N.pdf

hth Karl


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