Thermal Resistance Calculator
Calculate junction temperature through a chain of thermal resistances from junction to ambient.
W
°C/W
°C/W
°C/W
°C
Junction Temperature
85.0 °C
Total Thermal Resistance12.0 °C/W
Case Temperature70.0 °C
Junction Temperature vs Power Dissipated
Thermal Resistance Chain
Formula
T_junction = T_ambient + P x (θjc + θcs + θsa)
Thermal resistances add in series like electrical resistances. Each interface adds temperature rise per watt of dissipation.
Example Calculation
5 W dissipation, theta_jc=3, theta_cs=1, theta_sa=8 C/W, 25C ambient.
- 01Total theta = 3 + 1 + 8 = 12 C/W
- 02T_junction = 25 + 5 x 12 = 85C
- 03T_case = 25 + 5 x 9 = 70C
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