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Old 18th July 2006, 04:58 PM   #1
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Question What is your choice of power supply/output FET's

To be on a safe side, it's always great to put a new part, with same label as old one, but it's not always possible and there are better parts on market these days. What is your choice of FET's: power supply and outputs? Especially TO-220AB ones.
I am using IRF540, IRF9540 as outputs, and HUF75339P3 for power supply. Seems to be working everywhere. Got an idea from MTX
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Old 18th July 2006, 05:01 PM   #2
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some like the IRFP240 + IRFP9610 combination
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Old 18th July 2006, 06:43 PM   #3
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Power supply:
For amps using IRFZ34 and IRFZ46 I use IRFZ44N. The Z46 is rated for slightly more current but has a significantly higher Rdson so the Z44s are likely to run cooler. I've never had a failure of the Z44s when used in place of the Z46s.

For amps using higher current FETs and low value gate resistors (less than ~50 ohms), I use IRF3205s.

For fully encapsulated FETs (like those used in Japanese amps), I use IRFIZ44.

For outputs in relatively new amplifiers, it is generally difficult to improve on the original. The manufacturers often use the highest rated (current rating) for the rail voltage used in the amplifier. For older amplifiers, you may be able to find a better substitute because the technology has advanced from the time that the amp was manufactured.
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Old 18th July 2006, 09:58 PM   #4
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working on older gear is a great way to bone up on components and their characteristics, what to look for and such. A great learning tool and it's surprising what pops out at you and what you learn.
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Old 19th July 2006, 05:38 AM   #5
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Power Supply = MTP75N06 Rds(on) = 9mW
Outputs = IRFP240/9240
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Old 19th July 2006, 07:54 AM   #6
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Power supply: IRF3205 55V 75A Rsd(on) 6.5m Ohm

And for output, same as N-Channel.
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Old 22nd July 2006, 03:55 PM   #7
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seems like the IRF3205 is the crowd favorite. same here. the car amps I make always use that.

I haven't changed output devices in amps yet.
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Old 23rd July 2006, 11:10 PM   #8
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IRF2804S-7P Rds=1.6mOhm. Makes the fullbridge a viable topology for 12V powered supplies.

http://www.irf.com/product-info/data...rf2804s-7p.pdf


Here's a new P-CH I found.

http://www.ixys.com/98769.pdf

I have not tried it yet, but with twice the current rating of an IRFP9240, it's worth a look.
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