Substitute for BUK437 MOSFET

sjdemark · 22nd November 2011, 03:04 AM

Hi,
I am repairing an old NAD 208 mosfet amplifier. It originally had BUK437-400B mosfets for its switching supply on the amp boards. It looks like it was repaired at some point and IRFP350 were substituted. Is that a suitable sub or is there a better substitute? Thanks!

ingenieus · 10:37 AM

I can't find a datasheet for the BUK437-400B. The one for the IRFP350 suggests that it is a very capable device.

homemodder · 22nd November 2011, 11:02 AM

The BUK437-400B is a 400 Volt, 11 amp max ID 180 watt mosfet intended for switching supplies. Its probably discontinued. The irfp350 looks to me like a ideal replacement and is better as its capable of more power.

sjdemark · 23rd November 2011, 12:27 AM

Thanks guys!

22nd November 2011, 03:04 AM	#1
sjdemark diyAudio Member Join Date: May 2008	Substitute for BUK437 MOSFET Hi, I am repairing an old NAD 208 mosfet amplifier. It originally had BUK437-400B mosfets for its switching supply on the amp boards. It looks like it was repaired at some point and IRFP350 were substituted. Is that a suitable sub or is there a better substitute? Thanks!

22nd November 2011, 10:34 AM	#2
ingenieus diyAudio Member Join Date: Apr 2011	I can't find a datasheet for the BUK437-400B. The one for the IRFP350 suggests that it is a very capable device. Last edited by ingenieus; 22nd November 2011 at 10:37 AM.

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22nd November 2011, 11:02 AM	#3
homemodder diyAudio Member Join Date: May 2006	The BUK437-400B is a 400 Volt, 11 amp max ID 180 watt mosfet intended for switching supplies. Its probably discontinued. The irfp350 looks to me like a ideal replacement and is better as its capable of more power.

23rd November 2011, 12:27 AM	#4
sjdemark diyAudio Member Join Date: May 2008	Thanks guys!

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