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Home › Analog Electronics › A transistor dissipates 2 W. If the total junction-to-ambient thermal resistance is 25 degrees C/W and ambient temperature is 30 degrees C, the estimated junction temperature is?
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Analog ElectronicsPower Amplifiers

A transistor dissipates 2 W. If the total junction-to-ambient thermal resistance is 25 degrees C/W and ambient temperature is 30 degrees C, the estimated junction temperature is?

  • A50 degrees C
  • B55 degrees C
  • C80 degrees C
  • D105 degrees C
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Correct Answer: C. 80 degrees C
Explanation: Temperature rise = P times thermal resistance = 2×25 = 50 degrees C. Junction temperature = 30+50 = 80 degrees C.
Reference: Standard analog electronics: power amplifiers
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