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Old 7th September 2013, 02:19 AM   #1
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Join Date: Jun 2010
Default driver subs

hi all
Can i used BD140 and BD139 in place of A1220 and C2690?
This is in a hifonics class D amp to drive the output FETs IRF640n

Also can i used them to drive the PS FETs when A1275 is being used as drivers?
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Old 7th September 2013, 05:06 AM   #2
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Join Date: Nov 2003
Location: Louisiana
They can be used in the supply. In an amp that uses 640s and 9640s, they may work but I think the voltage would be too high for the high-side drive to use the BD transistors.

Did the drivers for the outputs fail?
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Old 8th September 2013, 01:56 AM   #3
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The drivers did not fail but i wanted to change them.
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Old 8th September 2013, 06:48 AM   #4
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Join Date: Nov 2003
Location: Louisiana
Order them with your next parts order so you can have them if you need them. The A suffix parts are rated for higher voltage than the non-A suffix versions.

As a side note, I've never seen those driver transistors fail in any of the amps that use them with the small audio driver board.
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