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Old 27th February 2008, 06:31 PM   #1
KyferEz is offline KyferEz  United States
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Default HUF75343G Replacement?

I've got a couple of Kicker ZR1000 amps with blown supply FETs. They are HUF75343G. I can get them, but they not from my preferred vendors except in a TO220 package, and these are in TO247s.

I can however get HUF75344G FETs which are very similar, but with slightly lower RDSon (8mohm vs 9mohm) and higher Ciss (3200pF vs 3000pF) and slightly higher Qg (210nC vs 205nC).

They look like they will work Ok, and run cooler, except I could see that input capacitance being an issue... Anyone tried them or have opinions?

Thanks!
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Old 27th February 2008, 06:37 PM   #2
sdoom is offline sdoom  Germany
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What´s the value from the gate resistors ?
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Old 27th February 2008, 07:08 PM   #3
KyferEz is offline KyferEz  United States
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470ohm
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Old 27th February 2008, 07:52 PM   #4
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The gate resistors are 47 ohms. I'd use an IRFP064 if the originals are not available.
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Old 27th February 2008, 08:19 PM   #5
KyferEz is offline KyferEz  United States
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DOH! Stupid mistake on the resistance

Why the IRFP064? They have similar characteristics, but are MUCH more expensive than the HUF75344G parts. The only real difference I see -offhand- is that the IRFP064 has a higher continuous current rating if you go with the IRFP064NPBF. If I used the IRFP064VPBF it's even better at 130A and a 5.5mohm RDSon, but it has a real high Ciss and Qg...

Thanks!
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Old 27th February 2008, 09:35 PM   #6
Eva is offline Eva  Spain
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I think that HUF75344 is a new improved device that replaces HUF75343, but the difference is minimal so don't fear using the newer one. I know because when I ran out of HUF75343 and I went to buy more, I only found HUF75344 too.

On the other hand, IRFP064 is an ancient device with ancient performance and it's overpriced for quite obvious reasons. IR has developed much better automotive MOSFET since then, my two preferred ones are IRFZ48V and IRF2907Z.
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Old 27th February 2008, 09:57 PM   #7
KyferEz is offline KyferEz  United States
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Ok, thanks; that's what I thought may be the case. I guess I'll stick to the HUF75344G3 as they are only $1.816 at quantities of 10 and are available in the TO247 package I need...
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Old 27th February 2008, 10:26 PM   #8
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Even though the 064 has been around for quite a while, I've found nothing better (more rugged) for use in the power supply.

In the power supply of the Kicker ZR1000, there will be no difference in performance of the 75344 or the 064. If the 75344 is cheaper, use it.
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Old 27th February 2008, 10:31 PM   #9
KyferEz is offline KyferEz  United States
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Thanks Perry! I'm ordering them now.
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