Difficulty identifying SMD semis via markings

[DaveC]

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.

 

[Meat Plow]

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.

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

 

[DaveC]

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

No "HFJ" listings.

Thanks,
Dave

 

[Franc Zabkar]

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.

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

 

[N_Cook]

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.

some more sources
http://www.satcure-focus.com/design/page2.htm
http://www.schematicsforfree.com/archive/file/COMPONENTS/SMD Codebook.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 "filetypedf" "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

 

[Meat Plow]

No "HFJ" listings.

Thanks,
Dave

Sorry, was the only URL I had.

 

[Uffe Bærentsen]

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

 

[Rich Webb]

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).

 

[Meat Plow]

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).

Chromium for Linux seemed to handle the pop-up crap well. Clivetech needs
to find a better free host.

 

[DaveC]

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.

Dave

 

[DaveC]

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

Thanks, Uffe!

Dave

 

[DaveC]

some more sources

http://www.satcure-focus.com/design/page2.htm
http://www.schematicsforfree.com/archive/file/COMPONENTS/SMD Codebook.pdf
http://clivetec.superihost.com/SMD_CodesT.htm

Good resources. Thanks.

"part marking", "top code", "topcode" ,"top mark", "topmark" ,"marking" as
synonym adjunct keywords for SMD device coding via Google

[...]

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

Dave

 

[DaveC]

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
Thanks.

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

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?

Acquisition PCB, Tek TDS420 scope. No schematics in the public domain.

Thanks again,
Dave

 

[Uffe Bærentsen]

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.

 

[Rich Webb]

Sorry for that.
My TrendMicro took care of all that for me.

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! ;-)

 

[JosephKK]

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).

No-script in Firefox seems to have stopped the hosting driven crap cold.