HEXFET Complementary pairs. Recommendations please.

Mooly · 30th June 2008, 05:18 PM

Hi,
Probably should have loged in under an alias asking this one

HEXFET Complementary pairs !! Are any more "complementary" than others. I feel like dipping my toe in the water, and would appreciate any recommended combinations. I was thinking along the line of IRFP240 and IRFP9240 in the TO247AC insulated package.
I have a few ideas kicking around for a new amp build and want to see where it leads me.
Regards Karl

AndrewT · 30th June 2008, 07:24 PM

irfp240/9140

Mooly · 1st July 2008, 06:42 AM

Hi Andrew,
The 9140 ? that's a 100 volt device isn't it. Any reason why you paired this with the IRFP240 ? That could be a bit on the low side for what I had in mind. I should have said the rails would be in the -/+ 40 to 50 volt region.
What I was trying to get at is that with Bjt's I know some complementary pairs are much more - well complementary than others. I wondered if the same applied to HEXFET's and whether any particular pair stood out. And why ?
Thanks Karl

AndrewT · 1st July 2008, 08:39 AM

240/9140 deliberately chosen by a few designers due to better matching of the more important parameters.
And, yes, limited to +-50Vdc supply.

Mooly · 1st July 2008, 10:03 AM

Interesting --- Thanks. Just doing CPC and Rapid order now.

30th June 2008, 05:18 PM	#1
Mooly diyAudio Member Join Date: Sep 2007	HEXFET Complementary pairs. Recommendations please. Hi, Probably should have loged in under an alias asking this one HEXFET Complementary pairs !! Are any more "complementary" than others. I feel like dipping my toe in the water, and would appreciate any recommended combinations. I was thinking along the line of IRFP240 and IRFP9240 in the TO247AC insulated package. I have a few ideas kicking around for a new amp build and want to see where it leads me. Regards Karl

30th June 2008, 07:24 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	irfp240/9140 __________________ regards Andrew T.

1st July 2008, 08:39 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	240/9140 deliberately chosen by a few designers due to better matching of the more important parameters. And, yes, limited to +-50Vdc supply. __________________ regards Andrew T.

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1st July 2008, 06:42 AM	#3
Mooly diyAudio Member Join Date: Sep 2007	Hi Andrew, The 9140 ? that's a 100 volt device isn't it. Any reason why you paired this with the IRFP240 ? That could be a bit on the low side for what I had in mind. I should have said the rails would be in the -/+ 40 to 50 volt region. What I was trying to get at is that with Bjt's I know some complementary pairs are much more - well complementary than others. I wondered if the same applied to HEXFET's and whether any particular pair stood out. And why ? Thanks Karl

1st July 2008, 10:03 AM	#5
Mooly diyAudio Member Join Date: Sep 2007	Interesting --- Thanks. Just doing CPC and Rapid order now.

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