Bipolar transistors

How does the current gain hFE of a silicon bipolar transistor generally change as temperature rises?

  1. AIt increases
  2. BIt decreases
  3. CIt does not change
Show answer and explanation

Answer: A. It increases

The hFE of silicon transistors generally increases with temperature. This is one reason the operating point shifts with temperature, so bias circuits are designed to stabilize it. The decrease in base-emitter voltage with rising temperature also increases the collector current.

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More Bipolar transistors questions

  1. Which condition increases the small-signal input resistance (hie) of a common-emitter amplifier?
  2. What is the advantage of an active load, which uses a transistor acting as a current source instead of a load resistor in an amplifier?
  3. When a switching transistor is turned off from deep saturation, what is the main reason it takes time to turn off?
  4. Which is a typical family of logic ICs built with bipolar transistors?
  5. Which pairing of a technology that integrates bipolar transistors and CMOS on the same chip with its purpose is correct?