Who knows the part number and the vendor of this BJT? - RF Cafe Forums

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yfish
Post subject: Who knows the part number and the vendor of this BJT?
Unread postPosted: Tue Jan 18, 2005 6:58 pm

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can anybody know the part number and the vendor of the following 2 BJTs?

1. SOT23 package, NPN type, with the characters "ADQ57" on the back;

2. SOT23 package, PNP, with the characters "HB" on the back;

Thanks.

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Kirt Blattenberger
Post subject:
Unread postPosted: Wed Jan 19, 2005 12:06 am
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Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
I can't be certain without doing more research, but here is a good start for you.

2. Likely Siemens (noe Infineon) since marking is similar to this (see HB):
http://www.tkb-4u.com/code/smdcode/smdcodeH.php

1. The AD listing here has a BCY-58 SOT23 package by Philips:
http://www.tkb-4u.com/code/smdcode/smdcodeA.php

You might be able to do a Google Search on "ic package markings" or a similar string to find your part. Good luck.

- Kirt Blattenberger :smt024

Posted 11/12/2012