Hi All!
Why is the BJT rarely used?

 

Hi All!
Why is the BJT rarely used?

The selection of the transistor (BJT or FET) depends upon the application. Why do you think BJT's are rarely used?

 

Two answers to that, IC's have replaced everything in general. In specific BJTs are pretty common, you look at the shelves of electronic outlets and they represent over half the discreete amplifier devices.

There are just more devices to pick from, and some of them do better jobs than others. Like those outlets, my parts bin has tons of BJTs. They are good general purpose devices.

Hang around here and you will see plenty being used in various designs.

 

I think it is wrong to say BJTs are rarely used; it would be more accurate to say FETs are increasingly used. As Bill suggests, the increasing use of the IC has implicitly brought about an increase in the use of FET because in terms of IC fabrication FETs offer massive advantages in terms of ease of manufacture and scalability for high-density applications.

Dave