Power dissipation calculator

Calculates the power dissipation of a component package in free air and without any heat sinking material. The result is an estimation based on typical thermal values of components.

Example 1: Must calculate the junction temperature of the semiconductor packaged in PDIP40 case dissipating 800mW of power in 25 degrees ambient temperatureView example
Example 2: Must calculate the maximum ambient temperature of the semiconductor packaged in TO-220 case having a maximum junction temperature of 150 degrees celsius and is dissipating 1.6 watts of powerView example
Example 3: Must calculate the maximum power dissipation of the semiconductor packaged in SOT-23 case having a maximum junction temperature of 150 degrees celsius and is required to operate in 60 degrees ambient temperatureView example
Package 
Ambient temperaturedegrees celsius
Junction temperaturedegrees celsius
Powerwatts
You may use one of the following SI prefix after a value: p=pico, n=nano, u=micro, m=milli, k=kilo, M=mega, G=giga
Results
J-A thermal resistance45 °C/W
Junction temperature61 degrees