Heat Sink Temperature Calculator

Input Parameters

Typical values of Thermal Resistance for Various Electronics Packages

Package	Junction to Case (°C/Watt)	Junction to Air (°C/Watt)
TO-3	5	60
TO-39	12	140
TO-220	3	62.5
TO-220FB	3	50
TO-223	30.6	53
TO-252	5	92
TO-263	23.5	50
D2PAK	4	35

Thermal Resistance for PCB Copper

Heat Sink	Thermal resistance (°C/Watt)
1 sq inch of 1 ounce PCB copper	43
.5 sq inch of 1 ounce PCB copper	50
.3 sq inch of 1 ounce PCB copper	56
Aavid Thermalloy, SMT heat sink: PN:573400D00010	14

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