The PNP transistor has one N region between two P regions (Fig. The semiconductor physics of BJTs will not be discussed here, but it is worth mentioning that a BJT is fabricated with three separately doped regions with two junctions. The Base is responsible for controlling the transistor while the Collector is the positive lead, and Emitter is the negative lead. A transistor is an active device with three terminals, and these three terminals are known as the Emitter (E), the Base (B), and the Collector (C) (Fig. BJTs are made of doped materials and can be configured as NPN and PNP. There are two main types of transistor: bipolar junction transistors (BJTs) and field effect transistors (FETs). Let’s take a closer look at how NPN and PNP transistors work. It’s easy to remember that NPN stands for Negative-Positive-Negative and PNP stands for Positive-Negative-Positive. This simple device can be used to create complex electronic circuits, and although there are other types of transistors, bipolar junction transistors are still widely used in digital circuits.īoth are used in various amplification and modulating circuits the most frequent among its applications is being fully ON and OFF, which is referred to as switch mode. The transistor is a three-terminal electronic device that can be used to control the flow of electric current, and was the first electronic device that could amplify or switch an electric current. The transistor is probably the most important invention in electronic engineering and the basis for nearly all integrated circuits (ICs).
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