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In NPN transistors, a thin layer of P type is sandwiched between two N type layers.

In PNP transistors, a thin layer of N type is sandwiched between two P type layers. Transistors are also used in circuits together with integrated circuits, since it is often more practical to use discrete transistors where higher power output is needed, which is higher than the integrated circuit output.įigures show the symbol and structure of PNP and NPN transistors, respectively. Catalog Datasheet MFG & Type PDF Document Tags 2003 - pb4350. These transistors are amongst the most widely used devices for amplification of all types of electrical signals and intermediate devices in discrete circuits, i.e., circuits made from individual components rather than integrated circuits.

Most transistors used today are NPN because this is the easiest type to make from silicon. The letters refer to the layers of semiconductor material used to make the transistor. Transistor Types: BJT, JFET, and MOSFET Bipolar Junction Transistor (BJT) NPN and PNP Junction Field Effect Transistor (JFET) N-channel and P-channel Metal Oxide Semiconductor FET (MOSFET) Depletion type (n-and p-channel) and enhancement type (n-and p-channel) BJT JFET MOSFET BJT Types NPN and PNP. It is nothing but an ordinary transistor. There are two types of standard (bipolar junction) transistors, NPN and PNP, with different circuit symbols. Bipolar Junction Transistor – Study Materialsįor All Subject Study Materials – Click Here A transistor is made of semiconductor and there are various types of transistors depending on their characteristics and has their advantages and disadvantages.