Benefits of NPN transistor

The transistor is a semiconductor unit that can amplify the

electronic indications like television and radio signal. It is

important material of every electronic circuit. Today vacuum

tubes are replaced through transistor and there are lot of

benefits are gained by the transistors. The advantages are

higher efficiency, low functioning voltage; it does not need

any filament power and small size and ruggedness. It is a

three terminal unit like emitter, base and collector. It can be

functioning by three configurations like the common emitter,

common base and common collector.

Based up on the configuration mode, it can be availed for

voltage and current amplification. The principle of transfer of

resistance has offered by the name of transfer resistor. The

two kinds of transistors like unipolar junction transistor and

bipolar junction transistor. In the first one, the current

conduction is due to one kind of carriers like majority

carriers. In the second type the current conduction is due to

both the kinds of charge carriers are electrons and holes.

Therefore this is known as bipolar junction transistor. It

contains two types like NPN type and PNP type. To run the

transistor effectively like an amplifier, it is important to bias

properly the two p-n junctions with outside voltages. Based

up on the outside bias voltage usage of polarity and the

transistor operates in one three areas like cut off region,

active region and saturation region.

The transistor can be made by using five primary methods

and basically they are classified as alloy type, grown type,

diffusion type and electro chemically etched type. Grown

type technique is availed to make the pn junctions. A single

crystal is taken from a melt of germanium or silicon whose

impurity content is change at the time of crystal extracting

procedure. Alloy type construction is also called as fused

construction. In this the centre part is a thin wafer of

material is from n- type. The collector is produced bigger

than the emitter to cope up the power dissipation and heavy

current at the base junction. In the electronically etched

type, the depression is done on the opposite end of the

semiconductor wafer to lessen the thickness of the base

part. The devices are also called as surface barrier transistor.

But these devices are not having business importance.

Diffusion is the procedure, by which a great amount of

concentration of particles will diffuse in to the close region of

reduced concentration. The basic variation between the alloy

and diffusion process is that liquefaction is not reach in the

process. Heat is offered to the process to rise the activity of

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