Basic Electronics Types of Transistors - Learn Basic Electronics in simple and easy steps starting from basic to advanced concepts with examples including. Bipolar Junction transistors, different FET transistors, are current-controlled devices. A small current entering in the base region of the transistor causes a much larger current flow from the emitter to the collector region. Bipolar junction transistors come in two major types, NPN and PNP. Bipolar Junction transistors, unlike FET transistors, are current-controlled devices. A small current entering in the base region of the transistor causes a much larger current flow from the emitter to the collector region. Bipolar junction transistors come in two main types, NPN and PNP.


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These are specially designed transistors operating in avalanche breakdown region where the operating voltage will be greater than types of transistors break-down voltage and possess very high switching speeds.

These are the transistors where two individual transistors are cascaded in such a way that the resulting device possesses a very high current gain. This kind of transistor is specially designed to realize the NAND logical operation.

Transistor - Wikipedia

It is used to amplify very-low types of transistors signals present types of transistors noisy environments by adding the signal constructively, but the random noise stochastically.

These are formed by diffusing the semiconductor material with the necessary dopants. Field Effect Transistor FET These are the voltage-controlled transistors which are tri-terminal wherein the Gate terminal controls the flow of current between the Source and the Drain terminals.

These are also called unipolar devices as their conduction current is only due to the majority charge carriers according to which they can be either n-channel the majority charge carriers are electrons FETs or p-channel the majority charge carriers are holes FETs.

These devices have an insulating layer beneath their Gate terminal which results in very high input impedance. These can be types of transistors of depletion- or enhancement-mode in nature depending on whether they have a pre-existing channel or not which inturn influence their behaviour in the presence and absence of gate voltage.


These are particularly useful in RF applications and have two serial gate controls. These are characterized types of transistors the presence of a hetero-junction which comprises of different materials on either side of the junction and are used types of transistors very high microwave frequency applications.

These are double gate transistors whose effective channel width is decided upon by the thin silicon 'fin' forming the body of the device.

Types of Transistors

types of transistors The image represents a typical bipolar transistor in a circuit. Charge will flow between emitter and collector terminals depending on the current in the base.

Because internally the base and emitter connections types of transistors like a semiconductor diode, a voltage drop develops between base and emitter while the base current exists.

The amount of this voltage depends on the material the transistor is made from, and is referred to as Types of transistors. Transistor as a switch[ edit ] BJT used as an electronic switch, in grounded-emitter configuration.

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Transistors are commonly used in digital circuits as electronic switches which can be either in an "on" or "off" state, both for high-power applications such as switched-mode power supplies and for low-power applications such as logic gates.

Important parameters for this application include the current switched, the voltage handled, and the switching speed, characterised by the rise and types of transistors times.

In a grounded-emitter transistor circuit, such as the light-switch circuit shown, as the base voltage rises, the types of transistors and collector currents rise exponentially.

The collector voltage drops because of reduced resistance from collector to emitter. If the voltage types of transistors between the collector and emitter were zero or near zerothe collector current would be limited only by the load resistance light bulb and the supply voltage.

Different Types of Transistors and Their Working

This is called saturation because current is flowing from collector to emitter freely. When saturated, the switch is said to be on.


The transistor provides current gain, allowing a relatively large current in the collector to be switched by a much smaller current into the base terminal. The ratio of these currents varies depending on the type types of transistors transistor, and even for a particular type, varies depending on the collector current.


In the example light-switch circuit shown, the resistor is chosen to provide enough base current to ensure the types of transistors will be saturated. In a switching circuit, the idea is to simulate, as near as possible, the ideal switch having the properties of open circuit when off, short circuit when on, and an instantaneous transition between the two states.

The PNP transistor is made by placing an ntype material between two p-type materials. BJT is a current controlled device.

Basic Electronics Types of Transistors

A normal transistor which we had discussed in the previous chapters come under this category. The functionality, configurations and types of transistors are all the same.

It is a voltage controlled device unlike a bipolar junction transistor.