Two p-n junction diodes can be sandwiched back to back to form a p-n-p or n-p-n junction transistor. … In a transistor, the middle layer (here n-region) is called the base, the forward biased p-n junction is called the emitter junction and the reverse biased p-n junction is called collector junction.
Is transistor a pn junction diode?
Is a pn junction a transistor?
The Transistor is a three terminal solid state device which is formed by connecting two diodes back to back. Hence it has got two PN junctions. Three terminals are drawn out of the three semiconductor materials present in it. This type of connection offers two types of transistors.
Is a transistor a type of diode?
The main difference between diode and transistor is that transistor is a three terminal device which passes current from high resistance region to low resistance region while the diode is a two-terminal device which current in only one direction from the anode to the cathode.
How the transistor is different from the pn junction diode?
The crucial difference between diode and transistor is that the diode is two terminal device while the transistor is the three terminal device. PN junction diode consists of one depletion region, i.e. between P-type and N-type, but the transistor consists of two depletion layers.
What is pn junction diode example?
A p-n junction diode is two-terminal or two-electrode semiconductor device, which allows the electric current in only one direction while blocks the electric current in opposite or reverse direction. … The p-n junction diode is made from the semiconductor materials such as silicon, germanium, and gallium arsenide.
Which has a pn junction?
p-n junction, in electronics, the interface within diodes, transistors, and other semiconductor devices between two different types of materials called p-type and n-type semiconductors. These materials are formed by the deliberate addition of impurities to pure semiconductor materials, such as silicon.
What are the two pn junction of a transistor?
The bipolar transistor is composed of two closely coupled p-n junctions. The emitter-base p+-n junction is forward-biased and has low resistance. The majority carriers (holes) in the p+-emitter are injected (or emitted) into the base region. The base-collector n-p junction is reverse-biased.
What is meant by a transistor?
Definition of transistor 1 : a solid-state electronic device that is used to control the flow of electricity in electronic equipment and usually consists of a small block of a semiconductor (such as germanium) with at least three electrodes. 2 : a transistorized radio.
What is transistor made of?
Most transistors are made from very pure silicon, and some from germanium, but certain other semiconductor materials are sometimes used. A transistor may have only one kind of charge carrier, in a field-effect transistor, or may have two kinds of charge carriers in bipolar junction transistor devices.