emitter

A bipolar junction transistor (BJT) is commonly used as an amplifier or switch in electronic circuits. As a three-terminal device, it has an input stage and an output stage. At the input stage, the VI characteristics of a transistor are similar to the forward-bias characteristics of a signal diode. The transistor turns on (i.e., begins…

In A guide to bipolar junction transistors, the definition and types of transistors and their applications are covered. In What to look for in a BJT transistor datasheet, transistor specifications are discussed, including what’s required before using or choosing a transistor in a circuit. In this article, we’ll explain what transistor configurations are and why…

The term transistor is derived from the words “transfer and “resistor.” The first semiconductor transistor was invented to replace the triode as an amplifier device, a vacuum tube with three electrodes. The transistor was smaller, lighter, and cheaper than a vacuum tube triode. It also proved easy to construct and had no heat losses like…