Rockford amp replacement output fets

seankane · 23rd November 2011, 09:27 AM

The 540 and 540A are still readily available but I was wondering........

Looking on fairchilds web site when typing a search for the 540A they say obsolete or discontinued. The replacement they now manufacture for it is FQP33N10. The data sheets are almost identical.

Question is has anyone tried these in a Rockford amp to see if they work or have had any problems?

CBS240 · 23rd November 2011, 10:59 AM

Compare the datasheets....

IRF540

FQP33N10

As far as a few general differences, IRF540 is a hexfet, or plural well, cellular structure. FQP33N10 uses planer stripe architecture. There is a bit of difference in Cgd but they have similar Gm. Planer stripe seems to be more rugged, one of the reasons I like to use them.

brandes.cm · 23rd November 2011, 12:14 PM

I will usually use a fairchild cross in a rockford (non-d class) amp.

23rd November 2011, 09:27 AM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Rockford amp replacement output fets The 540 and 540A are still readily available but I was wondering........ Looking on fairchilds web site when typing a search for the 540A they say obsolete or discontinued. The replacement they now manufacture for it is FQP33N10. The data sheets are almost identical. Question is has anyone tried these in a Rockford amp to see if they work or have had any problems? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

23rd November 2011, 10:59 AM	#2
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Compare the datasheets.... IRF540 FQP33N10 As far as a few general differences, IRF540 is a hexfet, or plural well, cellular structure. FQP33N10 uses planer stripe architecture. There is a bit of difference in Cgd but they have similar Gm. Planer stripe seems to be more rugged, one of the reasons I like to use them. __________________ All the trouble I've ever been in started out as fun......

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23rd November 2011, 12:14 PM	#3
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	I will usually use a fairchild cross in a rockford (non-d class) amp.

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