Inputs
Max Junction Temperature (°C)
From component datasheet
Ambient Temperature (°C)
Power Dissipation (W)
θ Junction-to-Case (°C/W)
From datasheet (Rθjc)
Calculate
Required Heat Sink
Max θ Heat Sink-to-Ambient
—
Formula:
θ_sa = (Tj − Ta)/Pd − θ_jc
Choose a heat sink with thermal resistance ≤ this value.