Comparing PNP and NPN

摘要

There are two main types of transistor: bipolar junction transistors (BJTs) and field effect transistors (FETs). BJTs are made of doped materials and can be configured as NPN and PNP. A transistor is an active device with three terminals, and these three terminals are known as the Emitter (E), the Base (B), and the Collector (C) (Fig. 1). The Base is responsible for controlling the transistor while the Collector is the positive lead, and Emitter is the negative lead.