Brief PNP BJT switch circuit – Bipolar Junction Transistor

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

Brief circuit schematics with short video – List of pages

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

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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

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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 has a maximum of 200mA of collector current. 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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