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What does the saturation current of a junction field effect transistor mean?

  • A.The current at which the gate junction begins to conduct
  • B.The drain current at zero gate voltage beyond pinch-off
  • C.The largest current the device may carry continuously
  • D.The current at which the channel resistance is lowest

Answer: B

The saturation current is the drain current with the gate at the source potential, operating beyond pinch-off - the top of the transfer characteristic. It is a characteristic value rather than a rating, and the device's continuous rating is a separate and usually larger figure. Distinguishing a point on a characteristic from a limit the manufacturer imposes matters, because the two are quoted in the same units and often confused.

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