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Why do many MOSFET devices have built-in gate protective Zener diodes?
The gate-protective Zener diode prevents the gate insulation from being punctured by small static charges or excessive voltages
The gate of a MOSFET is highly insulated and very sensitive to electrostatic discharge (ESD) or overvoltage, which can puncture the thin gate oxide. The Zener diode provides a path to shunt excessive voltage.
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