Selecting Heat Sink Transistor Equation and Calculator
Selecting a Heat Sink for a Transistor Equation and Calculator:
1 Steady operating conditions exist.
2 The transistor case is isothermal at 90°C.
3 The contact resistance between the transistor and the heat sink is negligible.
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A commercially available heat sink is to be selected to keep the case temperature of a transistor below design temperature.
Rate of heat transfer
Q = Heat Steady State Transfer (W)
R = Thermal Resistance of Heat Sink (°C/W)
ΔT = Tcase - Tambient (°C)