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Difference between BJT and FET

Difference between BJT and FET

Both bipolar junction transistors (BJTs) and field-effect transistors (FETs) are common transistor types found in many electronic devices. While BJTs and FETs share some similarities, there are also several key differences between the two transistor types. In this blog post, we will explore the differences between BJTs and FETs, and discuss which transistor type is better suited for specific applications.

What is BJT?

BJT stands for bipolar junction transistor. It is a type of semiconductor that uses both electrons and holes as charge carriers. BJTs are made of three sections: the emitter, the base, and the collector. The emitter is where the electrons come from, and the collector is where they go. The base is in between the emitter and the collector, and its main purpose is to control the flow of electrons. BJTs can be used as amplifiers or switches, and they are found in a wide range of electronic devices.

What is FET?

A FET transistor is a semiconductor device that uses an electric field to control the flow of electrons. FETs are used in digital circuits as switches or amplifiers. FETs can be used to build logic gates and other digital circuits. FETs are also used in RF amplifiers and oscillators. FETs are made from materials like silicon, germanium, and gallium arsenide. FETs can be either n-channel or p-channel. FETs are classified into two types: MOSFET and JFET. MOSFETs are used in digital circuits while JFETs are used in analog circuits. FET transistors can be either enhancement-type or depletion-type. Enhancement-type FET transistors have a higher current carrying capacity than depletion-type FET transistors. FET transistors can be used as either switching devices or amplifying devices. FET amplifiers are used in audio systems and RF systems. FET switching devices are used in power supplies and motor controllers.

Difference between BJT and FET

BJT and FET are two types of transistors. BJT uses bipolar junction while FET uses field effect. The biggest difference between the two is that BJT conducts current in two directions while FET only conducts current in one direction. This means that BJT is better suited for amplifying AC signals while FET is better suited for amplifying DC signals. BJT is also more likely to suffer from problems like self-heating and noise. However, BJT is more widely used because it is simpler and cheaper to manufacture.


BJTs and FETs are two of the most common transistor types. While they share some similarities, there are also some key differences between them. In this post, we’ve looked at those differences and explored how they impact circuit design. We hope you found this information helpful!

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