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sam9 22nd September 2003 07:08 PM

MOSFET Output Pair Suggestions ??
I've made a couple of small BJT amps in the low power range (15V-30V) and I thinking about doing something similar using MOSFETs in a SF configuration. Physical size is a factor so I'm looking for a TO-220 package. Scanning the usual catalogs (DMgikey, Mouser, etc) it is hard to figure out what would constitute a complimentary pair.

Any suggestions in this regard? Naturally it would be nice if they were readily available.

PMA 22nd September 2003 07:17 PM


DrG 22nd September 2003 07:53 PM

In your specified voltage range IRF510 / IRF9510 would probably suffice.

millwood 22nd September 2003 09:08 PM

I would 2nd PMA's suggestion.

My experience with those mosfets tho. is that they are not very stable in anything other than an EF-equivalent set-up.

Other than that, those are great output devices, impossible to blow-up, :).

BTW, those aren't complimentory pairs. The Hitachi pair is but they are expensive.

blmn 23rd September 2003 12:17 AM

As millwood said, they are not complimentary. For example, different gate capacitances must be considered during the design.


sam9 23rd September 2003 01:07 AM

Thanks for the input. I found SPICE models at the DuncanAmp website, so I will be working with those for a while. At least then I will have some idea what the likelyhood of getting ssomething satisfactory will be.

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