On Wed, 13 Nov 2013 19:28:02 -0800 John Larkin
wrote in Message id:
:

On Mon, 11 Nov 2013 07:38:52 -0500, Jay wrote:

Hello,

I am having a high failure rate on a 2N7000 FET that drives a relay coil.
Please see the attached jpeg. This gate drive is coming from a 5 volt
PIC18F452 pin 5 (RD7/PSP7) Any thoughts greatly appreciated. Note that it
will run for quite awhile, perhaps 20 to 30 thousand cycles before failing
entirely shorted Drain to Source.

Thanks.

What's the actual gate drive voltage?

About 5 volts or so. You must have missed the scope capture. Anyway I'm
all set, JT's idea of using a 74HC04 worked well.
Thanks.