SFH9240 instead IRFP240-aleph-x - diyAudio
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Old 29th June 2006, 09:12 AM   #1
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Default 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

Cheers
Dan
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Old 29th June 2006, 09:17 AM   #2
Luke is offline Luke  New Zealand
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digikey.com 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
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Old 29th June 2006, 09:24 AM   #3
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Bear in mind that IRFP244B and IRF240 are n-channel devices and SFP9240 is p-channel.
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Old 29th June 2006, 09:26 AM   #4
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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.
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Old 29th June 2006, 09:33 AM   #5
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OK SFP9240 is outta the question
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Old 29th June 2006, 09:38 AM   #6
Luke is offline Luke  New Zealand
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http://www.mouser.com/index.cfm?hand..._pcodeid=51229

this is perfect, and a good price I think.

seeya arthur
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Old 29th June 2006, 11:18 AM   #7
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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.
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Old 29th June 2006, 03:31 PM   #8
gl is offline gl  United States
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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.

Cheers,
Graeme
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Old 29th June 2006, 05:48 PM   #9
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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
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Old 29th June 2006, 06:01 PM   #10
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x1000? I hope you dont blow whole channel
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