Discussion
What precaution protects a MOSFET input in service?
Answer: A
Integrated clamp diodes to the rails divert any excess charge before the oxide is stressed, and most MOSFETs are supplied with them built in. A series resistor limits the current after breakdown has begun rather than preventing it, and neither a capacitor nor a bead limits the voltage. Protecting against an overvoltage means providing a path at a safe voltage, which is what a clamp does and what the alternatives do not.
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