Help me identify this transistor

Thread Starter

sp00nix

Joined Apr 10, 2010
4
I'm trying to diagnose a PWM circuit and it has a transistor that i cannot find any info on. I tried to google without luck. Only markings is has are J348 and 4D1.

Thanks!



Edit: Added image
 
Last edited:

bertus

Joined Apr 5, 2008
22,270
Hello,

It is most probably an 2SJ248, a fast switching Mosfet.
(very often the 2S is ommitted).
(see attached datasheet).

Bertus
 

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Thread Starter

sp00nix

Joined Apr 10, 2010
4
Ah thank you my good man. I get no reading between the gate and any other pin on my ohm meter. Would this suggest this is bad?
 

Thread Starter

sp00nix

Joined Apr 10, 2010
4
Heh, i put it all back together and it works now :). I guess there was some bad solder joints.

Thanks for the info, at least i came out knowing a bit more :)
 
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