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How can I calculate the junction-to-ambient thermal resistance, Rth(j-a), of a small-signal transistor?
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