Irfp240/9240 A75

PassFan · 4th July 2008, 01:59 PM

I recently re assembled my old A75 into a new case using half the output devices and Oh WOW... I'd forgotten what a big class A amp sounded like. Anyway, my 240/9240's are running at about .180 millivolts per channel for 6 devices and are about 59 deg. C. Does anyone know what the temp. peak is for these devices and how long I can expect them to last at this temp.? I lost my old datasheets and cant find these at IR's site. Thanks in advance.

MEH · 4th July 2008, 02:08 PM

They are Vishay parts now.

IRFP240
IRFP9240

PassFan · 4th July 2008, 02:46 PM

Many thanks, just what I needed.

space2000 · 6th July 2008, 02:52 PM

Quote:

Originally posted by PassFan
I recently re assembled my old A75 into a new case using half the output devices and Oh WOW... I'd forgotten what a big class A amp sounded like. Anyway, my 240/9240's are running at about .180 millivolts per channel for 6 devices and are about 59 deg. C. Does anyone know what the temp. peak is for these devices and how long I can expect them to last at this temp.? I lost my old datasheets and cant find these at IR's site. Thanks in advance.

hi,

i want to know how did you mswr this 0.180 volts. is this at output mosfets?

thanks

MEGA-amp · 6th July 2008, 02:58 PM

measure across the source resistors of the output mosfets.

4th July 2008, 01:59 PM	#1
PassFan diyAudio Member Join Date: Aug 2001 Location: Central FL	Irfp240/9240 A75 I recently re assembled my old A75 into a new case using half the output devices and Oh WOW... I'd forgotten what a big class A amp sounded like. Anyway, my 240/9240's are running at about .180 millivolts per channel for 6 devices and are about 59 deg. C. Does anyone know what the temp. peak is for these devices and how long I can expect them to last at this temp.? I lost my old datasheets and cant find these at IR's site. Thanks in advance.

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4th July 2008, 02:08 PM	#2
MEH diyAudio Member Join Date: Feb 2007	They are Vishay parts now. IRFP240 IRFP9240

4th July 2008, 02:46 PM	#3
PassFan diyAudio Member Join Date: Aug 2001 Location: Central FL	Many thanks, just what I needed.

6th July 2008, 02:58 PM	#5
MEGA-amp diyAudio Member Join Date: Oct 2003 Location: Newington, CT	measure across the source resistors of the output mosfets.