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How Can I Calculate The Junction-to-ambient Thermal Resistance, Rth (j-a), Of A Small-signal Transistor?

Answer»

The junction-to-ambient THERMAL resistance, Rth (j-a), of a small-signal transistor can be calculated from its COLLECTOR power dissipation as follows:

  • Equation: Rth (j-a) ＝ (Tj MAX - TA） / PC MAX
  • Rth (j-a): Junction-to-ambient thermal resistance.
  • Tj Max: Maximum junction temperature.
  • Ta: Ambient temperature (temperature CONDITION of PC Max).
  • PC Max: Maximum collector power dissipation.

The junction-to-ambient thermal resistance, Rth (j-a), of a small-signal transistor can be calculated from its collector power dissipation as follows:


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