What Are The Two Main Types Of Transistors?

What is transistor with diagram?

Diagram ‘A’ shows an NPN transistor which is often used as a type of switch.

A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter).

The circuit shown in diagram B is based on an NPN transistor..

Which is better PNP or NPN transistor?

A NPN transistor has electrons as majority charge carriers whereas the PNP transistor has holes as majority charge carrier. The mobility of electrons is better than mobility of holes. … mobility of electrons is more than hole,so as a result npn transistor are faster than pnp that’s why they are preferred..

What is P-type transistor?

Works in exactly the opposite fashion from the N-type transistor. When gate is supplied with 0 volts, we have closed circuit like a wire between the source and the drain. When the gate is supplied 2.9 volts, P-type transistor acts like an open circuit with broken connection.

What is transistor and uses?

Transistors are a three terminal semiconductor device used to regulate current, or to amplify an input signal into a greater output signal. Transistors are also used to switch electronic signals.

Which of the transistor current is always the largest?

emitter currentThe emitter current IE is always the largest one. The base current IB is always the smallest. The collector current IC and emitter current IE are relatively close in magnitude.

What is the difference between bipolar and unipolar transistors?

A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor, uses only one kind of charge carrier. … Hundreds of bipolar junction transistors can be made in one circuit at very low cost.

How do you identify a transistor?

Bipolar Junction Transistor (BJT) In plastic casing, one side of the transistor is Flat which is the front side and the pins are arranged serially. To identify the pins, keep the front flat side facing you and count the pins as one, two etc. In most NPN transistors it will be 1 (Collector), 2 (Base) and 3 ( Emitter ).

Can I use NPN instead of PNP?

Generally, the PNP transistor can replace NPN transistors in most electronic circuits, the only difference is the polarities of the voltages, and the directions of the current flow. PNP transistors can also be used as switching devices and an example of a PNP transistor switch is shown below.

How are transistors rated?

Power dissipation Just like resistors, transistors are rated for how many watts each can safely dissipate without sustaining damage. High temperature is the mortal enemy of all semiconductor devices, and bipolar transistors tend to be more susceptible to thermal damage than most.

What is the principle of transistor?

A transistor consists of two PN diodes connected back to back. It has three terminals namely emitter, base and collector. The basic idea behind a transistor is that it lets you control the flow of current through one channel by varying the intensity of a much smaller current that’s flowing through a second channel.

What is the unit of transistor?

Standard Electrical Units of MeasureElectrical ParameterMeasuring UnitSymbolCurrentAmpereI or iResistanceOhmR or ΩConductanceSiemenG or ℧CapacitanceFaradC6 more rows

What are the 2 types of transistors?

Basic Electronics – Types of TransistorsThe primary transistor is the BJT and FET is the modern version of transistor. Let us have a look at the BJTs. … The types of BJT are NPN and PNP transistors. … The FET is a unipolar device, which means that it is made using either p-type or n-type material as main substrate. … Source.

What is the difference between NPN and PNP transistor?

PNP switches On by a low signal whereas NPN switches ON by a high signal. As we are aware that in PNP transistor, the P represents the polarity of the emitter terminal and N represents the polarity of the base terminal.

Where are transistors used?

By far the most common application of transistors today is for computer memory chips—including solid-state multimedia storage devices for electronic games, cameras, and MP3 players—and microprocessors, where millions of components are embedded in a single integrated circuit.

What is difference between FET and transistor?

The major difference between BJT and FET is that in a field-effect transistor only majority charge carries flows, whereas in BJT both majority and minority charge carriers flow….Difference between BJT and FET.BJTFETBJT gain is moreFET gain is lessIts output impedance is high due to high gainIts output impedance is low due to low gain21 more rows

What are the different types of transistors?

Some types of transistors are listed below:Bipolar Junction Transistor.Diffusion Transistor.Avalanche Transistor.Schottky Transistor.Darlington Transistor.Heterojunction Bipolar Transistor.Field Effect Transistor.Junction FET Transistor.More items…

How are transistors named?

Its format for a transistor is a digit, two letters and a serial number. The first digit is the number of leads minus one, so it will be 2 for a bipolar transistor. … The second letter refers to transistor type, such as A for a high-frequency PNP transistor and C for an NPN high-frequency transistor.

What is a transistor symbol?

Transistor Symbols The symbol of NPN and PNP is shown in the figure below. The arrow in the symbol indicates the direction of flow of conventional current in the emitter with forward biasing applied to the emitter-base junction. The only difference between the NPN and PNP transistor is in the direction of the current.

What is PNP and NPN?

In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector.

Which type of transistor is most commonly used?

MOSFETThe MOSFET is by far the most widely used transistor for both digital circuits as well as analog circuits, accounting for 99.9% of all transistors in the world. The bipolar junction transistor (BJT) was previously the most commonly used transistor during the 1950s to 1960s.

What is the major difference between bipolar and unipolar device?

As their name implies, Bipolar Transistors are “Bipolar” devices because they operate with both types of charge carriers, Holes and Electrons. The Field Effect Transistor on the other hand is a “Unipolar” device that depends only on the conduction of electrons (N-channel) or holes (P-channel).