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fast drive circuits may produce ringing in the gate circuit and drain circuits. At turn-on, ringing in the gate circuit may produce a voltage transient in excess of the maximum V GS rating, which will puncture the gate oxide and destroy it.
At turn-off, the gate voltage may ring back up to the threshold voltage and turn on the device for a short period. There is also the possibility that the drain-source voltage will exceed its maximum rated voltage due to ringing in the drain circuit.
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