Alternative MOSFETS

>jacko< · 21st March 2007, 02:14 AM

Can anyone help me out, im trying to find some IRFZ44N VDSS = 55V, RDS(on) = 17.5mW, ID = 49A, MOSFET, N Channel transistors for my car amp, only everywhere i find theyre discontinued, what alternatives do i have to choose from ?

Magura · 21st March 2007, 02:23 AM

Off the top of my head, IRFP044 is about the same, just a TO-247 package. If you got room for the bigger package it's an easy solytion, as it's readily available and cheap.

Magura

>jacko< · 22nd March 2007, 12:41 AM

Thanx for that Magura, i will check RS online for a price

GordonW · 22nd March 2007, 04:54 PM

BUZ11 variants may also work. I've seen them interchanged in some car amps. Check the data sheets; there are small differences...

Regards,
Gordon.'

>jacko< · 25th March 2007, 07:57 AM

Am I correct in believing that as long as the replacement MOSFET is of larger values it should work ?

Oh a couple more questions I forgot to ask first time round,
1, what electrical equipment besides audio equipment are they used ?
2, I have some Photoelectric Proximity Switches & want to put them to use somewhere, the thing is they only kick out 150mA once triggered, is there some relay that can be switched with such a small current ? or maybe I could amplify the voltage from 150mA to a more useable voltage ?

Boris_The_Blade · 25th March 2007, 09:02 AM

Fairchild makes an equivalent HRFZ44N, available at digikey for $1.20 apiece. There are better ones you could get for increased efficiency though, like the HUF75339P3 (10mohms ON resistance), though it has a slightly higher gate charge, so there is a very very slim chance that it might not be compatible with the driver, depending on frequency and power dissipation in that driver. I would go with the latter, but then I am an experimenter...

good luck

21st March 2007, 02:14 AM	#1
>jacko< diyAudio Member Join Date: Apr 2005 Location: Manchester, UK	Alternative MOSFETS Can anyone help me out, im trying to find some IRFZ44N VDSS = 55V, RDS(on) = 17.5mW, ID = 49A, MOSFET, N Channel transistors for my car amp, only everywhere i find theyre discontinued, what alternatives do i have to choose from ? __________________ Jå¢kº - ²K5

21st March 2007, 02:23 AM	#2
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	Off the top of my head, IRFP044 is about the same, just a TO-247 package. If you got room for the bigger package it's an easy solytion, as it's readily available and cheap. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

22nd March 2007, 12:41 AM	#3
>jacko< diyAudio Member Join Date: Apr 2005 Location: Manchester, UK	Thanx for that Magura, i will check RS online for a price __________________ Jå¢kº - ²K5

22nd March 2007, 04:54 PM	#4
GordonW diyAudio Member Join Date: Mar 2005 Location: Marietta/Moultrie GA	BUZ11 variants may also work. I've seen them interchanged in some car amps. Check the data sheets; there are small differences... Regards, Gordon.' __________________ Speaker Design, Restoration and Repair- since 1985.

25th March 2007, 07:57 AM	#5
>jacko< diyAudio Member Join Date: Apr 2005 Location: Manchester, UK	Am I correct in believing that as long as the replacement MOSFET is of larger values it should work ? Oh a couple more questions I forgot to ask first time round, 1, what electrical equipment besides audio equipment are they used ? 2, I have some Photoelectric Proximity Switches & want to put them to use somewhere, the thing is they only kick out 150mA once triggered, is there some relay that can be switched with such a small current ? or maybe I could amplify the voltage from 150mA to a more useable voltage ? __________________ Jå¢kº - ²K5


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25th March 2007, 09:02 AM	#6
Boris_The_Blade diyAudio Member Join Date: Mar 2007	replacement FET Fairchild makes an equivalent HRFZ44N, available at digikey for $1.20 apiece. There are better ones you could get for increased efficiency though, like the HUF75339P3 (10mohms ON resistance), though it has a slightly higher gate charge, so there is a very very slim chance that it might not be compatible with the driver, depending on frequency and power dissipation in that driver. I would go with the latter, but then I am an experimenter... good luck

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