The Problem :

MOSFETs are crucial in electronics for switching and power control, but they’re sensitive to voltage spikes—especially when switching inductive loads like motors, relays, or solenoids. These spikes can exceed the MOSFET’s rated voltage, leading to overheating or permanent damage.

The Solution :

A MOSFET over-voltage clamp protects your component by limiting the voltage to a safe level. This is typically done using a Zener diode and resistor. The Zener diode clamps the voltage, while the resistor limits the current, preventing damage during transient spikes.

Practical Example :

Imagine you’re prototyping a DC motor driver for a home automation project. When the motor stops suddenly, it generates a back EMF (reverse voltage). This spike can destroy your MOSFET. By adding a 15V Zener diode between gate and source, and a current-limiting resistor, you prevent gate overstress.

Sample Calculation :

Let’s say your supply voltage is 24V, and you choose a 15V Zener diode to clamp the voltage.

R = (V_supply – V_zener) / I
R = (24V – 15V) / 0.01A = 900Ω

Choose a standard 1kΩ resistor rated for 0.25W or more.

This keeps your diode safe even during frequent spikes.

Product Recommendation :

Use Made in India components for cost-effective, reliable builds. Start with:

• High-quality MOSFETs (Made in India)

• [Zener Diodes for Clamping (Made in India)]

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