Heatsink calculator
This calculator will indicate if a heatsink is required and the maximum thermal resistance required. When choosing the heatsink you must select one which has a better (lower) thermal resistance than the value given.
T
amb
°C
Maximum ambient temperature
Pd
Watts
The maximum power to be dissipated by the device
T
j
max
°C
Maximum junction temperature of the device
R
th
(ja)
°C/Watt
Thermal resistance between the junction of the device and Ambient
R
th
(jc)
°C/Watt
Thermal resistance between the junction and case of the device
R
th
(ch)
°C/Watt
Thermal resistance between the case of the device and the Heatsink
R
th
(ha)