> From: Douglas Butler

>  There used to be FETs from IRF that
> had a fourth
> pin for current measurement, but I haven't seen them advertised for
> years and I don't remember what they were called.  Maybe
> someone on the
> list knows.
>

they exist as five pin devices. IR calls them HEXSense. Motorola (i think)
calls them SenseFET. For an example, check out International Rectifier
IRCZ44 datasheet

-Phil

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