Forrest W Christian wrote:
> Time for me to actually pick a few 'jellybean' parts.
>
> The main one I am having problems coming up with is a good jellybean
> MOSFET.  N Channel, Probably at least 60V, current isn't all that
> important - enough to drive a LED or two.  Probably in a SOT-23
> package or similar.  Oh and 3.3V logic compatible.

That's a bit unreasonable.  High drain voltage and high gate threshold
voltage go together somewhat due to device physics.  Do you really need it
to withstand 60V most of the time?  That's not what I call a jellybean part=
..
And if you do think you need 60V capability a lot, then maybe a bipolar is =
a
better choice if cheapness is important.

Think of what small FETs with low Rdson are really for, which is low voltag=
e
switching power supplies.  At higher voltages, the few 100mV drop of a
bipolar becomes less of a issue and a variety of other issues come up makin=
g
it unlikely any one part will be a reasonable choice often.  I would get
maybe 100 of IRLML0030.  They are what you are asking for except limited to
30V, which should be good enough for most cases.

If you just want to drive some LEDs, then a fancy FET is overkill.  That's
what the truly jellybean MMBT4401/4403 bipolar transistors are for.


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