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Old 23rd July 2009, 11:58 AM   #1
diyAudio Member
Join Date: Dec 2007
Default Cross for the FB21N30D ?

I've got this Orion 2500D apart and I need to replace some mosfets. I can't find any data on the FB21N30D.

There are also IRF9640's on the dead channel, I'm assuming that this is the complement of the FB's ? I'm wondering about using IRF640's ?
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Old 23rd July 2009, 01:48 PM   #2
Dimon74 is offline Dimon74  United States
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Join Date: Feb 2008
Orion amp uses IRFB31N20D not FB21n30.You can use there FQP34N20C or FQP32N20C
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Old 23rd July 2009, 01:55 PM   #3
Dimon74 is offline Dimon74  United States
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Replacement for IRF9640 is FQP12P20.You can replace IRFB31N20 with IRF640,but they have almost twice lower current,and higher Rds on resistance.I did that trick in JBL BPX2200.1 which uses same schematic as ORION 2500D but that will decrease capability to drive low ohm loads
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Old 23rd July 2009, 05:15 PM   #4
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Location: Louisiana
Someone sent me an amp with IRF640s in place of the IRFB31N20Ds and the IRF640s would overheat. Replacing them with the (original) IRFB31N20Ds solved that problem. Use the IRFB31N20D. The 9640 and the 31N20 are not complementary but they are the parts the amp was designed to use so that's what you should use when you replace them. Class D amps are a bit finicky when it comes to the outputs. If you ever want to experiment with different outputs, get the amp working properly with the original parts then try the subs.
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Old 23rd July 2009, 06:38 PM   #5
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Thanks guys, I will use the originals and I see they ARE available.

Sorry about that, I inverted the 2 and 3 when I wrote it down.
My apologies.
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