When building circuits with MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), heat dissipation is a key concern. MOSFETs often get hot when they handle high currents, and if not managed, this heat can damage the component and affect overall performance. A heat sink is a simple solution to prevent overheating and ensure your MOSFET operates efficiently.

The Problem :

Imagine you’re powering a small motor or a power supply. The MOSFET controlling the motor gets hot quickly because it’s switching large amounts of current. If the heat isn’t removed, the MOSFET could burn out, damaging your circuit and wasting valuable time and money.

The Solution :

A heat sink works by drawing heat away from the MOSFET and dissipating it into the air. The larger the heat sink, the better it can spread out the heat. This helps in maintaining the MOSFET’s performance over time.

Practical Example :

Think of your computer’s CPU. Just as the CPU needs a fan and heat sink to stay cool, your MOSFET does too. If you attach a heat sink to the MOSFET, it can dissipate heat efficiently, preventing overheating and ensuring smooth operation.

Sample Calculation :

If your MOSFET dissipates 10W of power, and the thermal resistance of the heat sink is 5°C/W, the temperature rise will be:

Temperature rise = Power × Thermal resistance
Temperature rise = 10W × 5°C/W = 50°C

So, the MOSFET temperature will rise by 50°C above ambient temperature.

This is manageable with a properly designed heat sink.

Shop Now

Need a MOSFET or heat sink? Check out Made in India options that are perfect for your next project:
Shop now at SmartXProKits.in

Support our work and India’s innovation—buy from our Make in India site!