What is a JFET?

JFET, or a Junction Field Effect Transistor, refers to a four terminal electrical voltage-control device. The four terminals are called gate, drain, source, and body respectively. A JFET, often known as JUGFET, possesses high input impedance and isolates the input and output voltages to a higher degree. 

Types of JFETs

JFETs can be categorised into two major types. These are:

• N-channel JFET: In these types of JFETs, electrons are majorly responsible for carrying electrical charges. They are made with an N type semiconductor as the base and a P type semiconductor as dopes at both ends. 
• P-channel JFET: In these types of JFETs, the electron holes are the charge carriers. They are made with a P type semiconductor as the base and an N type semiconductor as dopes at both ends.

Applications

Junction Field Effect Transistors (JFETs) have extensive applications across electronic and telecommunications industries. They are intrinsic parts of the electronic and communication products. More commonly, they are used as electronically controlled switches capable of controlling electronic power loads. JFETs are also used as amplifiers.