Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

Mos-Fets replacement
Mos-Fets replacement
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th February 2013, 09:23 AM   #1
Riddles is offline Riddles
diyAudio Member
 
Join Date: May 2011
Default Mos-Fets replacement

Hi,

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?
  Reply With Quote
Old 16th February 2013, 10:25 AM   #2
pergo is offline pergo  Italy
diyAudio Member
 
pergo's Avatar
 
Join Date: Dec 2008
2SK2378 ---> IRF640
2SJ406 --> IRF9640

for the IRF640, choose the non-N version or the -A version (IRF640 or IRF640A, not the IRF640N)
__________________
Nessuno puņ farvi sentire inferiori senza il vostro consenso
Mr.P Electronics
  Reply With Quote
Old 16th February 2013, 10:40 AM   #3
Riddles is offline Riddles
diyAudio Member
 
Join Date: May 2011
HI,

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.

Thanks
Jake
  Reply With Quote
Old 16th February 2013, 10:43 AM   #4
pergo is offline pergo  Italy
diyAudio Member
 
pergo's Avatar
 
Join Date: Dec 2008
you can also use FQP19N20 & FQP12P20
__________________
Nessuno puņ farvi sentire inferiori senza il vostro consenso
Mr.P Electronics
  Reply With Quote
Old 1st October 2017, 07:13 PM   #5
jlithen is offline jlithen  Finland
diyAudio Member
 
Join Date: Nov 2009
Location: Vaasa
Are you guys sure IRF 640/9640 work in these amps?
I just soldered in a parallel pair of IRF9640 in the same subwoofer and the amp now seems to operate fully in class-B I think.
Not switching. Of course something else may still be blown in it.
From the datasheets it can be seen that IRF has much higher VGS than 2SJ/2SK at least...

And yes all IRF640 are N-channel, but an IRF640N is a bit different from IRF640. That is what was meant earlier in the thread
  Reply With Quote
Old 2nd November 2017, 09:59 PM   #6
jlithen is offline jlithen  Finland
diyAudio Member
 
Join Date: Nov 2009
Location: Vaasa
For the record I bought some from aliexpress for 0.60€ each, fake, could be noticed from VGSth being high.
Bought some from UK for 10.20€ each, fake, RDSon was skyhigh at VGS= -4V
Sooo, back to trying with IRF.
  Reply With Quote

Reply


Mos-Fets replacementHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
24 x IRFP244 Mos-Fets KatieandDad Swap Meet 1 1st December 2011 06:53 PM
Matching IRFP244 MOS-FETs Andy5112405 Pass Labs 32 6th June 2011 12:22 PM
MOS-FETS exclusively, input to output, why Nelson? Jazzo Pass Labs 10 29th November 2007 04:53 AM
MOS FETs, BJTs or both? DarkOne Solid State 4 5th October 2001 02:14 AM


New To Site? Need Help?

All times are GMT. The time now is 12:47 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki