Heat Sink Calculator

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Inputs

Max Junction Temperature (°C)

From component datasheet

Ambient Temperature (°C)

Power Dissipation (W)

θ Junction-to-Case (°C/W)

From datasheet (Rθjc)

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.

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Heat Sink Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.