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Old 4th June 2004, 07:15 AM   #1
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Thumbs up new irfp mosfets

hello guys, what is the best choise for aleph 3/30?
here is no 244. but are theese:



IRFP064N (MOS-N-FET 55 V 110 A 200 W 0,008 Om TO-247)

IRFP140 (MOS-N-FET 100 V 27 A 140 W 0,052 Om TO-247)

IRFP150 (MOS-N-FET 100 V 40 A 230 W 0,06 Om TO-247)

IRFP260 (MOS-N-FET 200 V 46 A 280 W 0,055 Om TO-247)


or 240???

I am thinkingo of 064 model at a price?

any help is welcome..
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Old 4th June 2004, 12:43 PM   #2
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anybody?
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Old 4th June 2004, 12:55 PM   #3
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The 064 might not suit due to the total rail voltage of the Aleph30, all the others can be used.

My Aleph30 uses IRFP150, my Aleph-X the 140.

The IRFP240 is quite popular but I'd say go for the cheapest

Cheers

Andrea
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Old 4th June 2004, 12:56 PM   #4
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Default irf244 replacement

Most popular replacement is IRFP240.

I have used and prefer IRFP150.

Regards
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Old 4th June 2004, 02:28 PM   #5
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The IRFP240 is a good general purpose choice
and I seem to remember it being also one of
the cheaper ones. You can buy a bunch and be
building different Alephs and Zens for quite a
while.

That said, my A30 uses IRFP044's since I
happen to have them on hand and they
worked fine. I wouldn't use them with
higher voltage rails though.

Cheers,
Dennis
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Old 4th June 2004, 05:13 PM   #6
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Default Re: irf244 replacement

Quote:
Originally posted by rtirion
Most popular replacement is IRFP240.

I have used and prefer IRFP150.

Regards

Could you please tell us why you prefer the 150?

Jan
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Old 4th June 2004, 07:49 PM   #7
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Odd, I posted a reply and later couldn't find it.

In any case, I have pointed out before that the IRF250 is
a bit like two IRF240's in parallel, and the same is true of the
150 / 140. It has more transconductance and capacitance
and dissipation capability.

If you want to use it instead of a 140 / 240, then consider
using fewer in parallel, otherwise there is a bit of spectral
shift toward the bottom end. If you want better bass, that's
a fine way to get it.
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Old 4th June 2004, 10:21 PM   #8
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Jan,

Mr. Pass summed it up perfectly. And before I started building
the Aleph I "auditioned" a few different FETS in a pair of ZEN's.
To me IRFP150 was the winner, closely followed by IRFZ044N.
The later is in TO220 package.

I have also used them (the 150's) in two Aleph-X's.

Regards
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Old 5th June 2004, 08:01 AM   #9
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Quote:
Originally posted by Nelson Pass

In any case, I have pointed out before that the IRF250 is
a bit like two IRF240's in parallel, and the same is true of the
150 / 140. It has more transconductance and capacitance
and dissipation capability.

A 150 has more dissipation capability. This means that it get's less hot if used instead of a IRF240? Or described in another way: if you use 6 IRF150's in an Aleph 5, you need less heatsinking?

Jan
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Old 7th June 2004, 07:04 PM   #10
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No you need the same amount of heat sink for the same
temperature.
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