Question 3-5A3

MOSFET gates are incredibly sensitive to static electricity and excessive voltages due to their very high input impedance and thin insulating oxide layer. Even a small static charge can generate enough voltage to puncture and permanently damage this delicate gate oxide. **Zener diodes** are specifically designed to break down and conduct current at a precise reverse voltage (the Zener voltage). By integrating a Zener diode (or a pair of back-to-back Zeners) directly into the MOSFET gate input, any voltage exceeding the Zener voltage is safely shunted away from the gate to ground, protecting the device. **Schottky diodes** are known for their fast switching and low forward voltage drop, used in rectification and switching, but not for precise voltage clamping in this protective manner. **Metal oxide varistors (MOVs)** are discrete components used for larger surge protection in power circuits, not integrated into sensitive gates. **Tunnel diodes** exhibit negative resistance and are used in high-frequency oscillators, unrelated to overvoltage protection.