Good substitutes for IRF640N & IRF9640

Deadly Sones · 11th March 2011, 10:42 PM

I have a Harman kardon 051-B00012A-E with bad IRF640N & IRF9640. Are there any good substitutes? They appear to be hard to find, and was hoping to avoid buying over seas.

Thanks.

Deadly Sones · 11th March 2011, 10:45 PM

This would be the class d driver board.

richie00boy · 11th March 2011, 10:46 PM

They should be easy enough to find from major stockists as they are still being made, all the UK big suppliers carry them and not expensive either. You would be better off fitting the IRF640 note not N suffix, as the N suffix is a newer smaller die type that IR strongly recommend against using for linear/audio applications.

Deadly Sones · 11th March 2011, 10:54 PM

hmmm... interesting... I'll look into that... the original was a irf640N but if the irf640 is better than I'll go that route.

Would you happen to know of a reputable UK supplier that has these parts?

Thanks.

richie00boy · 11th March 2011, 11:22 PM

If it's a class-d amp you can ignore the comment about the N suffix version. RS and Farnell both carry them, Farnell bought Newark and I can't remember offhand who RS links up with in the US.

Deadly Sones · 11th March 2011, 11:55 PM

Oh, o.k. thanks... it's definitely a class D design.

11th March 2011, 10:42 PM	#1
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	Good substitutes for IRF640N & IRF9640 I have a Harman kardon 051-B00012A-E with bad IRF640N & IRF9640. Are there any good substitutes? They appear to be hard to find, and was hoping to avoid buying over seas. Thanks.

11th March 2011, 10:46 PM	#3
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	They should be easy enough to find from major stockists as they are still being made, all the UK big suppliers carry them and not expensive either. You would be better off fitting the IRF640 note not N suffix, as the N suffix is a newer smaller die type that IR strongly recommend against using for linear/audio applications. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

11th March 2011, 11:22 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	If it's a class-d amp you can ignore the comment about the N suffix version. RS and Farnell both carry them, Farnell bought Newark and I can't remember offhand who RS links up with in the US. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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11th March 2011, 10:45 PM	#2
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	This would be the class d driver board.

11th March 2011, 10:54 PM	#4
Deadly Sones diyAudio Member Join Date: Feb 2011 Location: Windsor, Ontario	hmmm... interesting... I'll look into that... the original was a irf640N but if the irf640 is better than I'll go that route. Would you happen to know of a reputable UK supplier that has these parts? Thanks.

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