> Vgs set at 4.5V, Ids rated to 4  but if you trigger at 2.5V, you can
> only pass 3.4A, due to the change in Rds ?
>
> So it would appear that I'm better off driving with a full 5V device
> rather than a 3.3V PIC.

That's not really much difference. Usually the device dissipation is the
big factor anyway, so if you need 4 amps you would get a device rated for
10.

Cheers,

Bob

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