Hi Drew!

Yeah, the datasheet says the body is internally connected to the case, and
if you look at the schematic that would be pin #4. Pin #1 is the source, #2
is the drain, and #3 is the gate.

Steve


On Fri, Aug 8, 2014 at 10:10 AM, Drew meyer <[log in to unmask]> wrote:

> Steve,
>
> Yes definitely old school.  My memory is that before we really approached
> all parts with ESD safety in mind, early FET transistors were extremely
> sensitive to ESD events.  They had no built in protection on the inputs as
> parts do today.  Thus these metal rings shipped on the parts to prevent a
> differential voltage between leads.  I believe that the gate insulation is
> the area at risk.
>
> If my memory is correct one lead is tied to the can to act as a shield
> when the part is installed in the board.
>
> Drew
>

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