Heat Sink Calculator

Calculate required thermal resistance for heat sinks. Includes junction, case, and heat sink temperature calculations.

Calculate required thermal resistance for heat sinks

Power Dissipation (W)

Max Junction Temp (°C)

Ambient Temp (°C)

Rjc - Junction to Case (°C/W)

Rcs - Case to Sink (°C/W)

Heat Sink Resistance (°C/W) - Optional

Thermal Interface Materials

Thermal paste: ~0.2-0.5 °C/W

Thermal pad: ~0.5-2 °C/W

Mica + grease: ~0.4-0.9 °C/W

Formula

Tj = Ta + P × (Rjc + Rcs + Rsa)