ST Part, what is it?

S

Sergey Kubushin

Guest
TO252, 3 lines:

ST CHN
K922
LD33B

What is it?


---
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* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
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** Posted from http://www.teranews.com **
 
Franc Zabkar <fzabkar@iinternode.on.net> wrote:
On Fri, 15 Aug 2008 01:35:50 -0400, Sergey Kubushin <ksi@koi8.net> 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?
Click to expand...
It might be anything at all... 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.

---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
** Posted from http://www.teranews.com **
 
Franc Zabkar <fzabkar@iinternode.on.net> wrote:
On Fri, 15 Aug 2008 13:12:04 -0400, Sergey Kubushin <ksi@koi8.net> put
finger to keyboard and composed:

Franc Zabkar <fzabkar@iinternode.on.net> wrote:
On Fri, 15 Aug 2008 01:35:50 -0400, Sergey Kubushin <ksi@koi8.net> 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?
Click to expand...
No. I simply got several tubes of those as a part of a big lot.

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-datasheets/Datasheets-31/DSA-605028.pdf

Maybe 13 characters is a little too much for one stanza. ;-)
Click to expand...
Yep, it is possible...

Some evidence in regard to the marking ...

http://www.micrel.com/_PDF/other/analog_part_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
Click to expand...
Eh, this is a biggest mystery :) They are selling a part exactly like mine
and there is no part No. either...

Thank you anyways, I'll try to burn one... However it doesn't look exactly
right to me because TO252 LD1117 parts from ST have "D" for package code,
not "B"...

---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************
** Posted from http://www.teranews.com **
 
On Fri, 15 Aug 2008 01:35:50 -0400, Sergey Kubushin <ksi@koi8.net> put
finger to keyboard and composed:

TO252, 3 lines:

ST CHN
K922
LD33B

What is it?
Click to expand...
Just a WAG, but could it be a low dropout 3.3V regulator?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Fri, 15 Aug 2008 13:12:04 -0400, Sergey Kubushin <ksi@koi8.net> put
finger to keyboard and composed:

Franc Zabkar <fzabkar@iinternode.on.net> wrote:
On Fri, 15 Aug 2008 01:35:50 -0400, Sergey Kubushin <ksi@koi8.net> 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...
Click to expand...
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.
Click to expand...
I believe it could be an LD1117BDT33TR LDO 3.3V regulator:
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-31/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/analog_part_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
--
Please remove one 'i' from my address when replying by email.
 
On Fri, 15 Aug 2008 20:14:28 -0400, Sergey Kubushin <ksi@koi8.net> put
finger to keyboard and composed:

Thank you anyways, I'll try to burn one... However it doesn't look exactly
right to me because TO252 LD1117 parts from ST have "D" for package code,
not "B"...
Click to expand...
See page 3 of the datasheet. Then search for LD33A, LD33B, and LD33D
at usbid.com.

The part number pattern seems pretty convincing to me.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Aug 16, 5:55 am, Franc Zabkar <fzab...@iinternode.on.net> wrote:
On Fri, 15 Aug 2008 20:14:28 -0400, Sergey Kubushin <k...@koi8.net> put
finger to keyboard and composed:

Thank you anyways, I'll try to burn one... However it doesn't look exactly
right to me because TO252 LD1117 parts from ST have "D" for package code,
not "B"...

See page 3 of the datasheet. Then search for LD33A, LD33B, and LD33D
at usbid.com.

The part number pattern seems pretty convincing to me.

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

Sorry to thread hijack - we've made some changes to the
DatasheetArchive to allow fulltext searching of all datasheets. It
enables engineers to find a part number from a basic spec and
manufacturer name.

Let me know what you think of this feature. Its new, looking for some
feedback.

Chris
 
On Sat, 16 Aug 2008 02:41:24 -0700 (PDT), admin@datasheetarchive.com
put finger to keyboard and composed:

Sorry to thread hijack - we've made some changes to the
DatasheetArchive to allow fulltext searching of all datasheets. It
enables engineers to find a part number from a basic spec and
manufacturer name.

Let me know what you think of this feature. Its new, looking for some
feedback.

Chris
Click to expand...
First let me thank you for a valuable resource. However, I really miss
your old wildcard search. Nowadays you can only search for "part*"
whereas before you could search for anything containing "part". This
severely hampers searches for ST MOSFETs, for example. These devices
usually drop the ST prefix which now makes them impossible to find in
your database.

One other gripe is that there is no contact information on your web
site which explains why you've come here for feedback. Thirdly, I
would like some way of contributing my own datasheets to your
database, or at least inform you of their existence. And how about a
"most wanted" feature so that users could help each other?

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

The full widcard search was removed only whilst we see how the new
indexing engine copes. part* requires far less processor power than
*part*. We have indexed millions of documents so this slows the server
down significantly.

I've enabled it on the first keyword now so you can dow *part* (only
in the first search search keyword though). This feature will be slow
because of the volume of data it searches.

Anyhow, thanks for the feedback. I'm looking into the other points you
raised. I can easily add a contact us page to start with.

Regards
 
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