![]() (ii) Base: It is lightly doped terminal through which electrons pass from the emitter to collector. As shown in the figure above, the emitter of PNP transistor (right side figure) is forward biased and supplies hole charges to its junction with the base while the emitter of NPN transistor (left side figure) supplies electron charges to its junction. base so that it can supply a large number of majority carriers. (i) Emitter: It is a heavily doped terminal through which electrons enter. The 3 terminals of the transistor are explained briefly: The Middle portion is known as the base which forms two junctions between the emitter and the collector as shown in the figure. The portion on one side is the emitter and the portion on the opposite side is the collector. Transistors comprise of three sections of doped semiconductors. A transistor is a combination of two p-n junction, that’s why it is considered as a combination of two diodes connected back to back.ĭarlington Transistor Transistor Terminals:.Most important factor in the function of a transistor is the middle section which is present as a very thin layer.In each type of the transistor, the following points may be noted: Sponsored Links Block diagram of NPN transistor Look for the image below for its basic block diagram. The basic block diagram of PNP transistor is shown in the image below: Block diagram of PNP transistor (ii) NPN Transistor:Īs the Name suggests, in this type of transistor, p-type semiconductor piece is sandwiched between two pieces of n-type semiconductor layers. In this type of transistor, n-type semiconductor piece is sandwiched between two pieces of p-type semiconductor layers. Sponsored Linksĭepending on the way of construction of transistor, it is of two types: (i) PNP Transistor: The process of sandwiching is called fabrication of transistor. Sponsored Links Different types of Transistors: Pictorial form Transistor construction:Ī Transistor is a three layer semiconductor device in which one type of semiconductor (Either P-type or N-type) is sandwiched between two similar other types of semiconductor. In short, “Transistors are the fundamental building block of modern electronic devices basically used for controlling, amplifying and generating electrical signals.” Before going on the working and operation part, let me first tell you about its construction. Earlier we have covered its basics in the previous post of transistors where I have explained about what it is and its types. PNP transistor and NPN Transistor are one of the most asked queries by students In this post, we are going to explain transistor working and its operation.
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