FQA28N15 & 36P15 Subs?

Therum · 14th October 2010, 12:06 AM

Hello Guys,

I have a Rockford amp that I am repairing. It uses a pair of FQA28N15 and FQA36P15 on the outputs (Shorted). I cant seem to find these anywhere. Futureelectronics, Mouser, Digikey, quest, octoparts. Nowhere. Not even ebay!

Does anyone have any suggestions on a good substitute for the transistors.

Therum · 28th October 2010, 12:09 PM

just wanted to let everyone know that I found some FQA44N08's in place of the FQA28n15 and they worked great. Just a FYI.

Perry Babin · 28th October 2010, 06:36 PM

For others considering this sub, it would only work on amps that have less than ±40v of rail voltage.

Therum · 29th October 2010, 01:33 AM

So half of the drain-source breakdown voltage indicates max rail voltage?

Perry Babin · 29th October 2010, 02:45 AM

The rail to rail voltage is seen by all of the output transistors. You have to have transistors that can withstand the full rail to rail voltage.

Therum · 29th October 2010, 06:56 PM

ah yes.. now i see. You're the man Perry. ; )

Dannie717 · 8th December 2010, 05:05 PM

Therum, just wanted to know what did you sub for the P3615's

mbates14 · 8th December 2010, 11:16 PM

I need subs for these as well. I got 2 rockfords down with the SAME issue.

newark had the 28N15 but i cannot find the 36N15s and the lead time is outrageous.

the IRFP9140 and IRFP140 might sub in, but the voltage is much less and the current is also less on the P-channel fet.

Perry Babin · 9th December 2010, 03:18 AM

mbates14 · 9th December 2010, 03:36 AM

wonder why they are so unobtainium right now.

14th October 2010, 12:06 AM	#1
Therum diyAudio Member Join Date: Oct 2009 Location: Douglasville Ga	FQA28N15 & 36P15 Subs? Hello Guys, I have a Rockford amp that I am repairing. It uses a pair of FQA28N15 and FQA36P15 on the outputs (Shorted). I cant seem to find these anywhere. Futureelectronics, Mouser, Digikey, quest, octoparts. Nowhere. Not even ebay! Does anyone have any suggestions on a good substitute for the transistors.

28th October 2010, 06:36 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	For others considering this sub, it would only work on amps that have less than ±40v of rail voltage. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th October 2010, 02:45 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The rail to rail voltage is seen by all of the output transistors. You have to have transistors that can withstand the full rail to rail voltage. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th December 2010, 03:18 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Onlinecomponents.com is supposed to have them by the end of this month. FAIRCHILD FQA28N15 \| Buy FQA28N15 \| FQA28N15 \| Onlinecomponents.com FAIRCHILD FQA36P15 \| Buy FQA36P15 \| FQA36P15 \| Onlinecomponents.com __________________ 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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28th October 2010, 12:09 PM	#2
Therum diyAudio Member Join Date: Oct 2009 Location: Douglasville Ga	just wanted to let everyone know that I found some FQA44N08's in place of the FQA28n15 and they worked great. Just a FYI.

29th October 2010, 01:33 AM	#4
Therum diyAudio Member Join Date: Oct 2009 Location: Douglasville Ga	So half of the drain-source breakdown voltage indicates max rail voltage?

29th October 2010, 06:56 PM	#6
Therum diyAudio Member Join Date: Oct 2009 Location: Douglasville Ga	ah yes.. now i see. You're the man Perry. ; )

8th December 2010, 05:05 PM	#7
Dannie717 diyAudio Member Join Date: Feb 2010	Therum, just wanted to know what did you sub for the P3615's

8th December 2010, 11:16 PM	#8
mbates14 diyAudio Member Join Date: Jun 2002 Location: non	I need subs for these as well. I got 2 rockfords down with the SAME issue. newark had the 28N15 but i cannot find the 36N15s and the lead time is outrageous. the IRFP9140 and IRFP140 might sub in, but the voltage is much less and the current is also less on the P-channel fet.

9th December 2010, 03:36 AM	#10
mbates14 diyAudio Member Join Date: Jun 2002 Location: non	wonder why they are so unobtainium right now.

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