I can't identify this fet

spooney · 12th November 2010, 09:31 PM

I just got a crunch powerzone p900.4 amp in and it is in need of some new power supply fets. I am having a little trouble though identifying what they actually are. They are made by ST and the only number that doesn't appear to be a datecode is P1806. Searches for this number haven't uncovered anything useful. Does anyone know what this part might be? They are using 100 ohm gate resistors if that helps. Thanks

Perry Babin · 12th November 2010, 09:46 PM

http://www.jingbei.com/pdf/stp1806.pdf

spooney · 12th November 2010, 11:07 PM

Thanks Perry. I searched that same part number but was unable to get anything on it. Hmm oh well. At least I know its not some crazy off the wall part. Just not resourceful enough I guess. The only fet I have on hand that I have enough of to make this repair are IRF3205's(I need 4 total). Would these work with 100 ohm gate resistors or should I change them out for something else? Or would I be much better off just getting a different fet. Maybe something like a irfz44?

Perry Babin · 12th November 2010, 11:15 PM

You'll likely have to replace the 100 ohm gate resistors with 47 ohm resistors if you use the 3205s. The Z44 should work with the 100 ohm resistors.

jackinnj · 13th November 2010, 02:06 AM

18 S gm -- beaucoup transconductance

12th November 2010, 09:31 PM	#1
spooney diyAudio Member Join Date: Dec 2006	I can't identify this fet I just got a crunch powerzone p900.4 amp in and it is in need of some new power supply fets. I am having a little trouble though identifying what they actually are. They are made by ST and the only number that doesn't appear to be a datecode is P1806. Searches for this number haven't uncovered anything useful. Does anyone know what this part might be? They are using 100 ohm gate resistors if that helps. Thanks

12th November 2010, 09:46 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	http://www.jingbei.com/pdf/stp1806.pdf __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th November 2010, 11:15 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You'll likely have to replace the 100 ohm gate resistors with 47 ohm resistors if you use the 3205s. The Z44 should work with the 100 ohm resistors. __________________ 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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12th November 2010, 11:07 PM	#3
spooney diyAudio Member Join Date: Dec 2006	Thanks Perry. I searched that same part number but was unable to get anything on it. Hmm oh well. At least I know its not some crazy off the wall part. Just not resourceful enough I guess. The only fet I have on hand that I have enough of to make this repair are IRF3205's(I need 4 total). Would these work with 100 ohm gate resistors or should I change them out for something else? Or would I be much better off just getting a different fet. Maybe something like a irfz44?

13th November 2010, 02:06 AM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	18 S gm -- beaucoup transconductance

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