Pinch-off voltage

Pinch-off voltage may refer to one of two different characteristics of a transistor:

in insulated-gate field-effect transistors (IFGET), "pinch-off" refers to the channel pinching that leads to current saturation behaviour under high source–drain bias.
in junction field-effect transistors (JFETs), "pinch-off" refers to the threshold voltage below which the transistor turns off.

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