Thermal engineering · Calculation tool

Thermal Resistance Stack & Heatsink Planner

Add junction-to-case, interface and heatsink-to-ambient thermal resistance to estimate junction temperature and remaining thermal headroom.

Rθ,total = RθJC + Rθinterface + RθSA. Estimated Tj = Ta + P × Rθ,total. Headroom = Tj,max − Tj. Steady-state one-dimensional series-path estimate only.

Common symptom presets

Presets are illustrative starting points. Review all values against your actual hardware.

Inputs

Estimate

Enter values, then calculate.

Results are theoretical calculations and do not guarantee compatibility, stability, electrical safety, or manufacturer compliance.

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Reference notes

RθJCJunction-to-case value from the component data sheet
RθCHInterface/contact path, including TIM and mounting
RθSAHeatsink-to-ambient value under stated airflow and orientation

Technical sources

This page is an educational estimate. Use current manufacturer datasheets and the complete applicable standard for design sign-off.