Difficulty identifying SMD semis via markings

D

DaveC

Guest
I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

Thanks.
 
On Thu, 27 May 2010 12:24:36 -0700, DaveC wrote:

I've never had to look up a SMD semi before now. Unlike JEDEC codes,
these less-than-brief alphanumeric codes have no standard that I can
find.

And if there's no manufacturer mark (or it has become illegible),
there's no hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available
for it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

Thanks.
Click to expand...
http://www.marsport.org.uk/smd/
 
On Thu, 27 May 2010 12:24:36 -0700, DaveC <invalid@invalid.net> put
finger to keyboard and composed:

I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

Thanks.
Click to expand...
FWIW, a "HF" marking code identifies a Toshiba 2SC3124 NPN transistor,
15V, 50mA, for TV Tuner, VHF Oscillator Applications:

http://www.datasheetcatalog.org/datasheet/toshiba/1264.pdf

The lowercase "j" may be unrelated to the part number.

For example, a Philips BCW89 transistor has a marking code of H3*,
where *=p for "Made in Hong Kong", or *=t for "Made in Malaysia".

http://www.nxp.com/documents/data_sheet/BCW89.pdf

You may be able to discern the manufacturer, or country of origin,
from the surrounding components. The function of the device may be
deduced from the circuit itself. For example, is the board part of a
tuner?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
DaveC <invalid@invalid.net> wrote in message
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's
no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for
it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

Thanks.
Click to expand...
some more sources
http://www.satcure-focus.com/design/page2.htm
http://www.schematicsforfree.com/archive/file/COMPONENTS/SMD%20Codebook.pdf
http://clivetec.superihost.com/SMD_CodesT.htm

"part marking", "top code", "topcode" ,"top mark", "topmark" ,"marking" as
synonym adjunct keywords for SMD device coding via Google
along with "datasheet" or "data" if many irrelevant returns eg searching for
SMD topmark D132 data , then
("D132" AND "datasheet" "top code" OR "topcode" OR "top mark" OR "topmark"
OR "marking" OR "part marking" )
entered into the searchbox. Or ("D132" AND "filetype:pdf" "top code" OR
"topcode" OR "top mark" OR "topmark"
OR "marking" OR "part marking" ) limiting to trade pdf sources only.
Any more synonyms gratefully received.
Or best search engine for picking up letter pairs / triplets, google not too
good for this
Or anyone know of a replacement for this , in its time very useful NEAR
function for Google searches?
http://www.staggernation.com/cgi-bin/gaps.cgi
ie in this case "marking" NEAR "D132" within 1 , 2 or 3 words that order or
each way , selectable


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm
 
On Thu, 27 May 2010 20:35:25 -0700, DaveC wrote:

http://www.marsport.org.uk/smd/

No "HFJ" listings.

Thanks,
Dave
Click to expand...
Sorry, was the only URL I had.
 
"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's
no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for
it.


Is there a device code data base? Maybe I just missed it in my Yahooing?
Click to expand...
There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm


and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm



--
Uffe Bćrentsen
 
On Fri, 28 May 2010 20:46:00 +0200, "Uffe Bćrentsen"
<leiti_NOSPAM_@hotmail.com> wrote:

"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's
no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for
it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm


and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm
Click to expand...
Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).

--
Rich Webb Norfolk, VA
 
Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).
Click to expand...
Yeah, I saw that. Pretty intense pop-ups. Still, the data is worth the trip.

Dave
 
There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm


and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm
Click to expand...
Thanks, Uffe!

Dave
 
some more sources
http://www.satcure-focus.com/design/page2.htm
http://www.schematicsforfree.com/archive/file/COMPONENTS/SMD%20Codebook.pdf
http://clivetec.superihost.com/SMD_CodesT.htm
Click to expand...
Good resources. Thanks.

"part marking", "top code", "topcode" ,"top mark", "topmark" ,"marking" as
synonym adjunct keywords for SMD device coding via Google
Click to expand...
[...]

Or, in other words, a Google is only as good as the terms used. Didn't know
about "top" term. Thanks.

Dave
 
FWIW, a "HF" marking code identifies a Toshiba 2SC3124 NPN transistor,
15V, 50mA, for TV Tuner, VHF Oscillator Applications:

http://www.datasheetcatalog.org/datasheet/toshiba/1264.pdf
Click to expand...
Thanks.

The lowercase "j" may be unrelated to the part number.
Click to expand...
Not lowercase. Uppercase, just smaller type than "HF"

For example, a Philips BCW89 transistor has a marking code of H3*,
where *=p for "Made in Hong Kong", or *=t for "Made in Malaysia".

http://www.nxp.com/documents/data_sheet/BCW89.pdf

You may be able to discern the manufacturer, or country of origin,
from the surrounding components. The function of the device may be
deduced from the circuit itself. For example, is the board part of a
tuner?
Click to expand...
Acquisition PCB, Tek TDS420 scope. No schematics in the public domain.

Thanks again,
Dave
 
On Fri, 28 May 2010 15:01:51 -0400, Rich Webb wrote:

On Fri, 28 May 2010 20:46:00 +0200, "Uffe BĂŚrentsen"
leiti_NOSPAM_@hotmail.com> wrote:


"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
I've never had to look up a SMD semi before now. Unlike JEDEC codes,
these less-than-brief alphanumeric codes have no standard that I can
find.

And if there's no manufacturer mark (or it has become illegible),
there's no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available
for it.


Is there a device code data base? Maybe I just missed it in my
Yahooing?

There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm


and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm

Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).
Click to expand...
Chromium for Linux seemed to handle the pop-up crap well. Clivetech needs
to find a better free host.
 
"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C82568ED02C8482DB01AD9AF@news.eternal-september.org...
Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).

Yeah, I saw that. Pretty intense pop-ups. Still, the data is worth the
trip.
Click to expand...
Sorry for that.
My TrendMicro took care of all that for me.



--
Uffe Bćrentsen
 
On Sat, 29 May 2010 13:44:54 +0200, "Uffe Bćrentsen"
<leiti_NOSPAM_@hotmail.com> wrote:

"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C82568ED02C8482DB01AD9AF@news.eternal-september.org...
Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).

Yeah, I saw that. Pretty intense pop-ups. Still, the data is worth the
trip.

Sorry for that.
My TrendMicro took care of all that for me.
Click to expand...
Can't blame them for trying to raise revenue, I guess. One would think,
though, that they'd turn it down a notch or two so as not to chase
people away. Or at least have dancing bears and cute puppies! ;-)

--
Rich Webb Norfolk, VA
 
On Fri, 28 May 2010 15:01:51 -0400, Rich Webb
<bbew.ar@mapson.nozirev.ten> wrote:

On Fri, 28 May 2010 20:46:00 +0200, "Uffe Bćrentsen"
leiti_NOSPAM_@hotmail.com> wrote:


"DaveC" <invalid@invalid.net> skrev i en meddelelse
news:0001HW.C824150402789DE5B01AD9AF@news.eternal-september.org...
I've never had to look up a SMD semi before now. Unlike JEDEC codes, these
less-than-brief alphanumeric codes have no standard that I can find.

And if there's no manufacturer mark (or it has become illegible), there's
no
hope of finding a replacement.

In my case:
HFJ (the "J" is smaller than the others), 3 terminal, SOT-23 size.

I'm speaking, of course, of a circuit that has no schematic available for
it.


Is there a device code data base? Maybe I just missed it in my Yahooing?

There is a database here:
http://www.clivetec.0catch.com/SMD_Codes.htm


and here you can find HF:
http://www.clivetec.0catch.com/SMD_CodesH.htm

Warning ... Do not visit the above site with javascript enabled and/or
an industrial strength pop-up blocker if you value your sanity (and
possibly your PC).
Click to expand...
No-script in Firefox seems to have stopped the hosting driven crap cold.
 
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