diyAudio (
-   Pass Labs (
-   -   SFH9240 instead IRFP240-aleph-x (

freakyone 29th June 2006 09:12 AM

SFH9240 instead IRFP240-aleph-x
Hello all

Just having some problems with Mouser and the fets i ordered, they no-longer make them,well fairchild dosent make them anymore IRFP244B-

has Anyone used the SFH9240 with there aleph-x?

Not a expert in this field so any info is good info


Luke 29th June 2006 09:17 AM has them and their freight to NZ isnt bad, I bought 100 from them a couple of years ago for some aleph 2s.
Let us know what deals you find, I may be interested in some for my aleph X sometime.

seeya arthur

richie00boy 29th June 2006 09:24 AM

Bear in mind that IRFP244B and IRF240 are n-channel devices and SFP9240 is p-channel.

freakyone 29th June 2006 09:26 AM

Hello Arthur

Ive already paid and had been waiting some..time, it would just be easier to stay with Mouser instead of getting a refund and jumping ship to Digi.:)

freakyone 29th June 2006 09:33 AM

OK SFP9240 is outta the question:(

Luke 29th June 2006 09:38 AM

this is perfect, and a good price I think.

seeya arthur

BobEllis 29th June 2006 11:18 AM

The item Luke linked to is in an isolated case - note the thermal resistance junction to case is quite high, but you don't have the isolator resistance to deal with.

On Fairchild's website they list FQA9P25 as a cross reference for the obsolete IRFP240 and IRFP240B. It has similar characteristics, and lower input capacitance.

What you have found is the RoHS compliance eliminating part numbers. Mouser part number 512-IRFP244B_Q is the compliant version of the IRFP244. I'm a little surprised Mouser couldn't help you with that.

gl 29th June 2006 03:31 PM

Hi freakyone,

Do a search for SFH9240. Four threads will come up - all with good info on this part. You'll notice I started two of them.

I have used the SFH9240 with success although never in an Aleph-X. As someone else mentioned, they are P channel parts and all of the Aleph-X implementations I've seen use the N channel 240's. I would not hesitate to use them as complementary followers with IRFP240's.

I have found that the SFH9240 has a smaller spread of Vgs values than the IR parts. This makes it easier to create matched sets. As a caveat I have to admit that my samples were only 100 to 150 parts.

I hope this all helps.


Tarasque 29th June 2006 05:48 PM

I still have some IRF's that were injtended for bulding my own X1000. (both the 240 as well as the 9240)
They arte selected in groups of 40 :cool:

elviukai 29th June 2006 06:01 PM

x1000? :) I hope you dont blow whole channel :D :devily: :devilr:

All times are GMT. The time now is 10:05 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 18.75%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio