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Usually, the p-n junction is considered a diode. The PNP transistors are mainly used to control current flow through the circuit. In PNP transistors, one n-type semiconductor is sandwiched between the two p-type semiconductors and creates two p-n junctions. In the NPN transistors, the current flow will be usually from the emitter to the collector region. These NPN transistors are widely used in many electronic devices, mainly to amplify weak signals. In NPN transistors, one p-type semiconductor is placed between two n-type semiconductors and it forms the two p-n junctions. Let us understand these types of transistors in detail. They are PNP transistors and NPN transistors.īJTs are classified into two types, PNP transistors and NPN transistors. In BJT, only less current will flow between base and emitter terminals and a larger current will flow between collector and emitter terminals.īased on the doping BJTs are mainly classified into two types. The three terminals are namely, base, emitter and collector. Usually, BJTs will have three terminals and two p-n junctions. They are unipolar junction transistors, bipolar junction transistors and field-effect transistors.

The transistors are mainly classified into three types based on p-n junctions. The main function of transistors is to regulate and control the flow of current in the electronic circuit. Usually, transistors will act either as a switch or as an amplifier. The transistors are semiconductor devices, which will conduct and resist the electric current and voltage. This article explains transistors and types, characteristics and working principles of BJT and types of BJT in detail. Usually, the BJT transistors do not require any external DC sources. Both the electrons and holes will act as the charge carriers in the Bipolar junction transistor. They are mainly used as amplifiers or current controlled devices in electronic circuits. Bipolar junction transistor (BJT) is the type of transistor and three-terminal semiconductor device, which has two p-n junctions.

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