"Dave" wrote in message
news:d3fUf.1230$K11.421@clgrps12...


Makes sense. One question: why do you say insulate the tab? If the tab
is
already connected to ground, and you are just adding a diode, wouldn't you
only have the 1V of potential difference between ground and the pin with a
diode?

Because the tab is connected to the ground pin internally. If you ground the
tab then the pin is also grounded, bypassing the diode.

Would I want to use a mica insulator between the tab and heatsink?


Yes. You'd need the whole heatsink 'kit', including the plastic insulating
collar which goes on the bolt, or a plastic bolt.

Dave