Thanks.
So, if I understand correctly, a TVS diode would go on each board from the "pic output to gate" to ground.
And additional TVS on the power rail. See pic.
The regulator maximum is 12 volts so in that case the TVS clamping rating should be 6volts?
The normal input voltage is from a 4 or 5 cell MIMH or 2cell LiPo so ~8.4 is the maximum voltage.
If the TVS is 6volts and the input voltage is 8.4 would the TVS always be clamping the voltage? Would that be a good idea?
I'd probably omit the pull-down. The failure mode for this should be the on state. Without radio power it becomes exponentially more difficult to control the plane.
Thanks for the help.
davidk
:edit: Doing some reading, I think the two TVS on the positive rail could be reduced to one. Positive doesn't contact any components on the FET board. And, actually, the one could probably be omitted all together. The clamping ramps up from the working voltage of say 12volts to cutoff of 20volts. With 8.4volts max input and 12volts max on the regulator would the TVS really be doing anything?