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Transistor ID Help please

Hello,
I am trying to repair a computer power supply, and of course the part
that burnt up is the only one I cannot identify. It is (I think) a
voltage regulator. It is a 3 pin package attached (screwed) to a
largish heat sink. It has the code k1821 on the face, and there is a
logo that looks like an 'F' over either a 'E' or a 'C' like so F
E
I have looked on NTE and chipdocs with no luck. Thanks!
 
D

Dave Platt

Jan 1, 1970
0
Hello,
I am trying to repair a computer power supply, and of course the part
that burnt up is the only one I cannot identify. It is (I think) a
voltage regulator. It is a 3 pin package attached (screwed) to a
largish heat sink. It has the code k1821 on the face, and there is a
logo that looks like an 'F' over either a 'E' or a 'C' like so F
E
I have looked on NTE and chipdocs with no luck. Thanks!

Transistors whose part number is an A, B, C, D, J, or K followed by a
three- or four-digit numbers are likely to be ones which use the
Japanese part ID conventions. An initial "2" is assumed.

I'd guess that you have a 2SK1821 (an N-channel power MOSFET),
probably made by Fuji. Try the following URL:

http://www.fujisemiconductor.com/pdf/mosfet_discrete/2sk1821_01mr.pdf

The basic specs don't look like anything terribly unusual - 600V, 2A
continuous / 6A pulsed, 30W, 6.5 ohms on-resistance. You might want
to go to a heftier part when rebuilding the supply. I'd guess that
there are a bunch of IR MOSFETs which would be acceptable substitutes
or upgrades.
 
W

Watson A.Name - Watt Sun, Dark Remover

Jan 1, 1970
0
Hello,
I am trying to repair a computer power supply, and of course the part
that burnt up is the only one I cannot identify. It is (I think) a
voltage regulator. It is a 3 pin package attached (screwed) to a
largish heat sink. It has the code k1821 on the face, and there is a
logo that looks like an 'F' over either a 'E' or a 'C' like so F
E
I have looked on NTE and chipdocs with no luck. Thanks!

It may be a 2SK1821 FET, which looks like an N-Channel according to
this data sheet. http://www.platan.ru/cgi-
bin/qwery.pl/id=34650&group=204&pg=0&ec=2SK1821.html

It says that 'structura' is N-Kanal' and I believe 600V and 2 Amps?

Why is it that when we do a search for these parts in Google, we get a
ton of Russian websites? Is it because they don't have so many money
grubbing companies over there that won't let anyone see the data
sheets?


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