Transistor Thermal Calculator

Calculate case temperature TC and the required heatsink resistance SA to prevent device overheating. All temperatures are in C and thermal resistances are in C/W.

Power Dissipation (PD) [W]

Max Junction Temp TJmax [°C]

Ambient Temp TA [°C]

Junction-to-Case JC [°C/W]

Case-to-Ambient CA [°C/W] (No Heatsink)

Case-to-Sink CS [°C/W] (Thermal Pad/Paste)

Calculated Case Temperature TC -- °C

Max Allowable Total Thermal Resistance JAmax -- °C/W

REQUIRED Heatsink Thermal Resistance SA -- °C/W

Decision: Heatsink Status