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. Recall that a BJT is a current-controlled device that is, the base current controls the amount of collector current. A very small current flowing between the base and emitter can control a larger flow of current between the collector and emitter terminal. Bipolar Junction Transistor (BJT) The three terminals of BJT are the base, emitter and collector. Now we will discuss the second major type of transistor, the FET (field-effect transistor). There are mainly two types of transistors, based on how they are used in a circuit. 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. BJTs (bipolar junction transistors) were covered in previous chapters. There are two types of field-effect transistors, theJunction Field-Effect Transistor (JFET) and the Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET), or Insulated-Gate Field-Effect Transistor (IGFET). It is nothing but an ordinary transistor.
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