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Old 3rd November 2008, 02:21 PM   #1
richto is offline richto  United Kingdom
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Default IRF31N20D Equivalent or Upgrade?

Hi,

What would be a suitable drop in IRF31N20D equivalent or upgrade?

For Car Audio Class D amplifier repairs would I be able to for instance replace all the IRF31N20D Hexfets with say the IRFB4227 with out major adverse effects?

IRF31N20D Is rated N / 200V / 31A / 200W / 0.082 Ohms
IRFB4227 is rated N / 200V / 65A / 330W / 0.024 Ohms

What are any other major considerations / limitations / recommendations?


Thanks.
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Old 3rd November 2008, 08:20 PM   #2
Eva is offline Eva  Spain
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IRFB4227 has different capacitances and a much faster body diode, but in general it's a good switching MOSFET and it could be a good replacement.
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Old 3rd November 2008, 08:50 PM   #3
richto is offline richto  United Kingdom
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Thanks for the reply -

What would be the likely impact of the differing capcitances and faster diode if I dropped this into an existing amp design?

Obviously I would replace all of the transistors - not just faulty ones.
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Old 3rd November 2008, 08:50 PM   #4
richto is offline richto  United Kingdom
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Here is a schematic of a sample amp in question if that helps:

http://www.bossaudio.com/servicemanu...le=GT2500D.pdf
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Old 4th November 2008, 02:09 PM   #5
richto is offline richto  United Kingdom
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And another very common MOSFET I am frequently replacing in Car audio Amps is the IRFZ44N

IRFZ44N is rated N / 55V / 41A / 83W / 0.024 Ohms

Any thoughts on upgrading that too? thanks.
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