What are different types of transistor?
David Craig
Updated on April 04, 2026
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.
What are the 2 basic types of transistors?
Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET).
What are the classification of FET?
FET transistors are classified into Junction Field Effect transistors (JFET) and Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) transistors.
What are types of BJT?
A bipolar transistor (bipolar junction transistor: BJT) consists of three semiconductor regions forming two junctions. There are two types of structure: npn and pnp. Products with npn up to 800 V and pnp up to -600 V are available. In addition, there are also bias resistor built-in transistors (BRTs).
Which type of transistor is most commonly used?
The 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 difference between FET and BJT?
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.
| BJT | FET |
|---|---|
| BJT gain is more | FET gain is less |
| Its output impedance is high due to high gain | Its output impedance is low due to low gain |
What transistors should I buy?
Best Transistors: BJTs
- #1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits.
- #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT.
- #3 Power – TIP120.
- #4 N-Channel (Logic Level) – FQP30N06L.
What are the types of BJT transistors?
The types of BJT are NPN and PNP transistors. The NPN transistor is made by placing a ptype material between two n-type materials. The PNP transistor is made by placing an ntype material between two p-type materials. BJT is a current controlled device.
What are multiple-emitter transistors?
Multiple-emitter transistors are basically special types of bipolar transistors with emitters that receive input signals from integrated circuit transistor-transistor logic NAND logic gates. When logical high voltage drives each emitter, the flow of collector current comes to a halt.
What are the applications of small signal transistors?
Small signal transistors are used in almost all types of electronic equipments and also these transistors are used in several applications, some of them are ON or OFF switches for general use, LED diode driver, Relay driver, Audio mute function, Timer circuits, Infrared diode amplifier, Bias supply circuits etc.
How many types of transistors are there in transistors?
Transistor Tree Diagram. The transistors classification can be understood by observing the above tree diagram. Transistors are basically classified into two types; they are Bipolar Junction Transistors (BJT) and Field Effect Transistors (FET).
