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Gate source leakage current of MOSFET...at high temperature?


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Depends upon whether the gate has Zener protection of the gate or not (and the data sheet doesn't state that).
If it does, as a rough guess you could assume the current doubles for every 10C rise in temperature, which gives about 6.4uA @ 85C.
If not, then the leakage should not change much with temperature.

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