PackagingMVP
Thermal resistance
Relate temperature rise, power, and thermal resistance with ΔT = P × Rθ. Fill any two; the third is computed.
Inputs
Result
Enter values and calculate to see the result.
Interpretation
Fill any two of ΔT, power, and thermal resistance; leave the third blank.
Formula
ΔT = P × Rθ
ΔT in °C, P in W, Rθ in °C/W.
Variables
| Symbol | Variable | Unit |
|---|---|---|
| ΔT | Temperature rise (junction above reference) | °C (= K) |
| P | Power dissipated | W |
| Rθ | Thermal resistance | °C/W |
Assumptions & validity
This tool assumes:
- Steady state; a single lumped thermal resistance.
- ΔT is a temperature difference, so °C and K are interchangeable here.
- No hotspots or transient behaviour modelled.
Worked example
P = 10 W, Rθ = 5 °C/W.
ΔT = 10 W × 5 °C/W = 50 °C