MOSFET Calculator

MOSFET Heatsink Calculator

Estimate MOSFET junction temperature and required heatsink thermal resistance.

MOSFET Heatsink Calculator Formula

Tj = Ta + P x RthetaJA

Useful for motor drivers, LED drivers, DC/DC converters, power switches and MCU-controlled loads.

Design note

Always check MOSFET datasheet limits, thermal resistance, gate charge, safe operating area and PCB copper area.

Result will appear here.