Difference Between BJT and FET
In following table some of the differences of BJT and FET is mentioned
BJT |
FET |
---|---|
BJT stands for Bipolar Junction Transistor. |
FET stands for Field Effect Transistor. |
It is current controlled device. |
It is voltage controlled device. |
In BJT both minority and majority charge carriers are responsible for flow of current. |
In FET only majority charge carriers are responsible for flow of current. |
It has three terminal Emitter , Base and collector. |
It has Drain , Source , Gate and Body but mostly body terminal is sorted so it is also three terminal device. |
BJT have low input impedance . |
FET have high input impedance. |
BJT is bipolar device. |
FET is unipolar device. |
BJT requires large chip area during fabrication . |
FET requires small chip area during fabrication. |
It is of two types NPN and PNP BJT. |
It is also of two types N channel FET and P channel FET. |
Switching speed is slower in BJT . |
Switching speed is faster in FET. |
BJT generate more noise. |
FET generate less noise. |
BJT is more susceptible to radiation. |
FET is less susceptible to radiation. |
Thermal stability is less is BJT. |
FET is more thermal stable. |
BJT consumes high power. |
FET consumes less power. |
Manufacturing coast is less . |
High manufacturing coast. |
BJT has higher gain bandwidth product. |
FET has lower bandwidth product. |
BJT has higher voltage drop . |
FET has less voltage drop. |
BJT is complex to fabricate. |
FET is less complex to fabricate than BJT. |
BJT is mainly used in low power applications. |
FET is used in high power applications. |
BJT has linear input – output relation. |
FET has non linear input – output relation. |
It has high voltage gain and less current gain. |
It has low voltage gain and high current gain. |
Difference Between BJT and FET
The transistor is a three-terminal semiconductor device, it is an active device that is used in most of the electronics devices. Transistors can be used as insulators and as conductors as needed. we can use a transistor as a switch and as an amplifier. It can be used with other circuit elements and can be able to amplify current and voltage. We can classify transistors into two types that is Bipolar, and Field Effect Transistor.
BJT is a three-terminal device, it has two PN junctions. It is mostly used analog electronic device because of its high current gain. FET is a very important component in today’s electronic devices. FET is a type of device in which electric fields are used to control the flow of charges or current flowing through a channel. Due to its high input impedance, low output impedance, and high gain capacity, they are widely used in electronic devices.
BJT and FET both are used in many different devices and they have many different characteristics that make them different from each other. In this article, we will go through all the things that make them different and we will get the overview of BJT and FET.
Table of Content
- What is BJT
- What is FET
- BJT vs FET operation comparison
- Difference Between BJT and FET
- Applications of BJT
- Applications of FET
- Conclusion
- FAQs