FKV550n replacement

candyman122 · 29th October 2009, 04:16 AM

I accidently shorted one of the fets (FKV550n) while looking at the waveforms on the o-scope. The fuse in the B+ line blew quickly, but apparently was too big. Now the amp draws excessive current. And these fets are shorted 2-3. I can't find a replacement, any suggestions on a suitable replacement or where can I find this fet? Thanks.

Perry Babin · 29th October 2009, 11:52 AM

If you need fully encapsulated FETs, there aren't many options. I use the IRFIZ44 (note that there are two 'I's).

Digi-Key - IRFIZ44NPBF-ND (Manufacturer - IRFIZ44NPBF)

jol50 · 1st November 2009, 02:37 AM

The IRFIZ worked fine in a couple I did with those in the PS. Sanken mosfet are hard to find or $15 each from sony or someone. The output transistors I've had much better luck getting.

29th October 2009, 04:16 AM	#1
candyman122 diyAudio Member Join Date: Aug 2009	FKV550n replacement I accidently shorted one of the fets (FKV550n) while looking at the waveforms on the o-scope. The fuse in the B+ line blew quickly, but apparently was too big. Now the amp draws excessive current. And these fets are shorted 2-3. I can't find a replacement, any suggestions on a suitable replacement or where can I find this fet? Thanks.

29th October 2009, 11:52 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you need fully encapsulated FETs, there aren't many options. I use the IRFIZ44 (note that there are two 'I's). Digi-Key - IRFIZ44NPBF-ND (Manufacturer - IRFIZ44NPBF) __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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1st November 2009, 02:37 AM	#3
jol50 diyAudio Member Join Date: Nov 2007	The IRFIZ worked fine in a couple I did with those in the PS. Sanken mosfet are hard to find or $15 each from sony or someone. The output transistors I've had much better luck getting.

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