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How can I calculate the channel-to-ambient thermal resistance, Rth(ch-a), of a small-signal MOSFET?

The channel-to-ambient thermal resistance, Rth(ch-a), of a small-signal MOSFET can be calculated from its drain power dissipation as follows:

 

Equation: Rth(ch-a) = (Tch Max - Ta) / PD Max

 

  • Rth(ch-a): Channel-to-ambient thermal resistance
  • Tch Max: Maximum channel temperature
  • Ta: Ambient temperature (temperature condition of PD Max)
  • PD Max: Maximum drain power dissipation
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