Brief PNP BJT switch circuit – Bipolar Junction Transistor

Table of Contents

PNP Bipolar Junction Transistor (BJT) lets you switch from the high side of the circuit.

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 



A lot of the components that I use are in this diode and transistor semiconductor kit.

Diagram

Simple PNP bipolar junction transistor BJT switch circuit schematic diagram by electronzap electronzapdotcom
Simple PNP bipolar junction transistor BJT switch circuit schematic diagram by electronzap electronzapdotcom 

Base resistor must provide enough signal current to saturate (fully turn on) the PNP transistor when the switch is closed. A 10kΩ resistor typically works well. The transistor must be able to handle the current demands of the load.

The 2N3906 maximum collector current rating is 200mA. As always, consult the component datasheet of the particular component you are using for the most accurate specifications.

Video

Quick PNP BJT switch circuit using 2N3908 bipolar junction transistor schematic to breadboard build

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