On Fri, 15 Aug 2008 13:12:04 -0400, Sergey Kubushin put
finger to keyboard and composed:

Franc Zabkar wrote:
On Fri, 15 Aug 2008 01:35:50 -0400, Sergey Kubushin put
finger to keyboard and composed:

TO252, 3 lines:

ST CHN
K922
LD33B

What is it?

Just a WAG, but could it be a low dropout 3.3V regulator?

It might be anything at all...

So this part is not out of some equipment that you are repairing?

I _HATE_ that practice of cryptic marking. I
can understand that e.g. SOT-23 doesn't have enough space to put the full
part number but TO252 is big enough to host a small poem.

I believe it could be an LD1117BDT33TR LDO 3.3V regulator:
http://www.datasheetarchive.com/pdf-...DSA-605028.pdf

Maybe 13 characters is a little too much for one stanza. ;-)

Some evidence in regard to the marking ...

http://www.micrel.com/_PDF/other/ana...id_marking.pdf

Analog Marking Information
LD33 MIC5206-3.3BM5 150mA Low-Noise LDO Regulator Fixed output

http://www-user.tu-chemnitz.de/~uwen/audigy/

ST LD33
+3.3V voltage regulator

http://www.diyaudio.com/forums/showthread/t-19911.html

4 regulators labelled something like 'LD33' (3.3v), LF50 (5V) ...

http://www.szljk.com/PART%20No6.htm

LD1117V33(MARKING:LD33V)

http://www.usbid.com/search/AddPartNoLogin_action.cfm

Search for LD33B and you will see ...

ld33b Description Mfr Date Code Qty Country
LD33B -- ST MICRO LOT: K922 300 US

- Franc Zabkar
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