What is a BJT? What are its advantages and disadvantages? - Electronics

What is a BJT? What are its advantages and disadvantages?

BJT refers to Bipolar Junction Transistor. It is a three-terminal electronic device constructed of doped semiconductor material. It is called ‘Bipolar’ because charge is carried by both, electrons and holes. Hence, operation of the device is due to bi poles (or opposite charges). Charge flow in a BJT is due flow of charges flow across a junction between two regions of different charge concentrations.

The following are the advantages of BJT-

-There is high current density.

- It operates in medium to high Voltage range.

- There is low forward voltage drop.

However, the following are some of the disadvantages-

-It has a very complex base control. Hence, it may lead to confusion and hence, requires skilful handling.

-The switching time is is not very fast compared to the high alternating frequency of voltage and current source.