At 06:52 AM 7/29/2008, you wrote:
>FDN338 is nice and perhaps about as cheap as GOOD P channel
>FETs get.
>YMMV

Indeed. For some values of "good". If you're looking for low gate charge,
it's not a good choice, nor are most of the other new low-Rds(on) MOSFETs.

A BSS84 is around 5 times better, and cheaper.

I've had to use multiple older MOSFETs in parallel to get an appropriately
low gate charge (actually, input capacitance).

Of course for most general purpose low frequency switching applications, the
newer types are wonderful, especially as you get up in current into the
hundreds of mA or A.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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