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Riddles 16th February 2013 09:23 AM

Mos-Fets replacement

I'm currently repairing a Yamaha YST-SW800 subwoofer and have found some of the Mos-Fets to be dead but am unable to locate the ones that i require.
This is what the service manual says and the parts that i need-

Q16- V5877200- FET- 2SK2378
Q18- V5877200- FET- 2SK2378
Q19- V5877000- FET- 2SJ406

Are there alternatives to these?

pergo 16th February 2013 10:25 AM

2SK2378 ---> IRF640
2SJ406 --> IRF9640

for the IRF640, choose the non-N version or the -A version (IRF640 or IRF640A, not the IRF640N)

Riddles 16th February 2013 10:40 AM


Brillaint thank you, have found the IRF9640 but all the IRF640 seem to be N-Channel although have found a IRF640A so think might be in luck.


pergo 16th February 2013 10:43 AM

you can also use FQP19N20 & FQP12P20

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