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What is the meaning of the term infinite heat sink on power MOS FET?

Latest Updated:03/01/2006


What is the meaning of the term "infinite heat sink" that appears on the total power dissipation vs. ambient temperature graph in power transistor and power MOS FET documentation?


This is assumed to mean "infinite heat sink ≈ Tc = 25°C". In other words, the case temperature must be kept to 25°C by attaching an extremely large heat radiator and externally dissipating the heat at the junction.
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