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

Latest Updated:03/01/2006

Question:

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?

Answer:

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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