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Analog ElectronicsPower Amplifiers

For a transistor dissipating 3 W with total junction-to-ambient thermal resistance of 20 degrees C/W at an ambient temperature of 30 degrees C, the estimated junction temperature is?

  • A50 degrees C
  • B60 degrees C
  • C90 degrees C
  • D110 degrees C
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Correct Answer: C. 90 degrees C
Explanation: The temperature rise is P×theta=3×20=60 degrees C. Adding 30 degrees C ambient gives an estimated junction temperature of 90 degrees C.
Reference: Standard analog electronics: thermal calculation
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