What is a Ok replacement for FB42N20D ??? - diyAudio
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Old 26th June 2007, 01:36 AM   #1
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Question What is a Ok replacement for FB42N20D ???

They are expensive and disappeared from everywhere
N-Channel, 200 V, 44A...
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Old 26th June 2007, 03:06 AM   #2
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You must be working on a MTX amp. have you tried the IR replacement part finder on the International rectifier site. Or the ST part finder on the St site.

Just a suggestion as I know what you mean about there price I think they are discontinued, so it won't get any better.
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Old 26th June 2007, 01:12 PM   #3
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Thanks, one IR distributor seems to have them in stock . But $5 a piece
After some digging, I think I am going to try 512-SSS45N20B, lets see what will happen
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Old 27th June 2007, 03:20 AM   #4
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The sss parts are fully encapsulated so if you use them you need to remove the original insulator.

They are also rated at only 80% of the current compared to the 42n20d. If the owner destroyed the higher rated ones, the others have very little chance of surviving.

FAI has the 42n20d in stock. If you buy 100 pcs, you can get them for less than $2.50 each. They are relatively common so it's a good part to keep in stock.
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Old 27th June 2007, 12:48 PM   #5
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Quote:
Originally posted by Perry Babin
The sss parts are fully encapsulated so if you use them you need to remove the original insulator.

They are also rated at only 80% of the current compared to the 42n20d. If the owner destroyed the higher rated ones, the others have very little chance of surviving.

FAI has the 42n20d in stock. If you buy 100 pcs, you can get them for less than $2.50 each. They are relatively common so it's a good part to keep in stock.

Yeah, that's true. These sub amps are always over-abused. Thank you so much for the information about FAI. Very good price
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Old 22nd June 2012, 10:57 PM   #6
Formas is offline Formas  Jamaica
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help anyone, Im currently working on an MTX thunder 1501d. some 42n20d is burnt out. what is likely a replacement if im unable to get them back, or what could be used?
I have also noticed an almost similar circuit, designed for coustic but made by MTX...in that design they used IRF250 for the outputs. on the MTX board ive also noticed that there are blank leg spacing for larger FETs, can these large IRF250 used in the output of the MTX 1501D Thunder?
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