PNP Bipolar Junction Transistor (BJT)

PNP Bipolar Junction Transistors (BJTs) behave like NPN BJTs, but with opposite polarities. NPN BJTs are usually studied before PNP so I will be assuming that you already understand the basic BJT principles. The PNP collector is almost always wired more negative than the emitter. There will be no PNP collector current flow unless the base voltage is at least 0.6 volt below emitter voltage.

Basics

2N3906 PNP bipolar junction transistor BJT schematic symbol and pin layout diagram by electronzap electronzapdotcom
2N3906 PNP bipolar junction transistor BJT schematic symbol and pin layout diagram by electronzap electronzapdotcom
  • Emitter more positive than collector. So emitter side of schematic symbol is usually higher up than collector.
  • 2N3906 in TO-92 package is a very common PNP BJT.

PNP transistor switch circuit

Clicking the diagram below brings you to a page that explains the diagram in more detail.

Basic electronics circuit fragments and simple circuits 7 PNP Bipolar Junction Transistor BJT Switch and capacitor fade off diagram by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 7 PNP Bipolar Junction Transistor BJT Switch and capacitor fade off diagram by electronzap electronzapdotcom

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