ClarityHow to use this tool
- Enter ambient temperature, heat dissipation, total thermal resistance.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Junction temperature = ambient temperature + dissipated power × total thermal resistance.
Using ambient temperature = 25 °C, heat dissipation = 2 W, total thermal resistance = 30 °C/W, the result is 85 °C. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Steady state with an applicable total thermal resistance. Electrical input power is not always equal to heat dissipation.
What to keep in mind
Steady state with an applicable total thermal resistance. Electrical input power is not always equal to heat dissipation. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.
Common questions
How do I use this junction temperature calculator?
Estimate semiconductor junction temperature using total junction-to-ambient thermal resistance. Enter ambient temperature in °C, heat dissipation in W, total thermal resistance in °C/W. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Steady state with an applicable total thermal resistance. Electrical input power is not always equal to heat dissipation.
Methodology maintained by ClarityKit. How these tools are built and checked.