What is your choice of power supply/output FET's

valterdaw · 18th July 2006, 03:58 PM

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

jackinnj · 18th July 2006, 04:01 PM

some like the IRFP240 + IRFP9610 combination

Perry Babin · 18th July 2006, 05:43 PM

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.

RetroAudio · 18th July 2006, 08:58 PM

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.

N-Channel · 19th July 2006, 04:38 AM

Power Supply = MTP75N06 Rds(on) = 9mW
Outputs = IRFP240/9240

ifrythings · 19th July 2006, 06:54 AM

Power supply: IRF3205 55V 75A Rsd(on) 6.5m Ohm

And for output, same as N-Channel.

djQUAN · 22nd July 2006, 02:55 PM

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.

nine76chris · 23rd July 2006, 10:10 PM

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.

18th July 2006, 03:58 PM	#1
valterdaw diyAudio Member Join Date: Jun 2006	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

18th July 2006, 05:43 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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18th July 2006, 04:01 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	some like the IRFP240 + IRFP9610 combination

18th July 2006, 08:58 PM	#4
RetroAudio diyAudio Member Join Date: Mar 2004 Location: Everett, WA	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.

19th July 2006, 04:38 AM	#5
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	Power Supply = MTP75N06 Rds(on) = 9mW Outputs = IRFP240/9240

19th July 2006, 06:54 AM	#6
ifrythings diyAudio Member Join Date: Oct 2005	Power supply: IRF3205 55V 75A Rsd(on) 6.5m Ohm And for output, same as N-Channel.

22nd July 2006, 02:55 PM	#7
djQUAN diyAudio Member Join Date: May 2004 Location: manila	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.

23rd July 2006, 10:10 PM	#8
nine76chris diyAudio Member Join Date: Jan 2004 Location: Ontario, Ca	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.