Saturation Region: Transistor acts as a closed switch in this mode of operation and it remains in a fully ‘ON’ state.īJTs are classified into two major categories:.Active Region: In this region, the transistor operates as an amplifier.Here the transistor stays in an ’OFF’ state. Cut-off Region: In this region, no current flows through the transistor and the transistor acts as an open switch.These transistors are basically operated in three regions:
If a little amount of current is applied to the base of a BJT transistor, a large amount of current flows from the emitter terminal to the collector. BJTs are basically current-controlled devices. In this device, ‘Bipolar’ means both electrons and holes which are essentially required for current flow and the term ‘Junction’ means PN junction. Bipolar Junction Transistor (BJT): BJTs are basically composed of three terminals, the base, the collector, and the emitter.The three layers of the transistor are mentioned below: The current through the transistor in a pair of terminals is controlled by the voltage or current applied to the other pair of terminals. These terminals help to make a connection with an external circuit and flow of the electric current. Transistor was developed in the year of 1947 by three American physicists, named Walter Brattain, John Bardeen, and William Shockley.Ī transistor is comprised of three layers of semiconductor materials, typically terminals. Transistor has become the most important element in modern electronics. So, in simple words, it can be said that a transistor is a miniature form of a device that can be used to regulate or restrict the flow of electronic signals. The transistor is an active component and a semiconductor device that is used as an amplifier to amplify the high- and low-level signals and utilized in oscillators, detectors, modulators as well as it can be employed as an electrically controlled switch in digital circuits.
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