What is JFET?

By Mandeep Kumar|Updated : July 8th, 2022

JFET stands for the junction-gate field-effect transistor. It is a semiconductor and one of the simplest types of field-effect transistor. They can be used as resistors, electronically-controlled switches, or to build amplifiers. 

Answer: JFET is a voltage-controlled device.

It doesn’t need a biasing current as the electric charge flows between the source and drain terminals. The current between the drain and the source can be controlled by gate-source voltage. It depends on the principle of a depletion region, hence sometimes it is also referred to as a depletion-mode device. In 1945, Heinrich Welker got the first patent of the JFET. It is doped to accommodate positive charges (holes) or negative charges (electrons). When both source-gate and drain-source potentials are zero, the JFET is in cut-off mode and hence does not conduct current.

Summary:

What is JFET?

JFET is voltage controlled device. It is a semiconductor device that has three terminals source, drain, and gate. JFET and Bipolar transistors are similar in appearance.

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