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PNP power transistor

TIP42C Working Principle

Learn how TIP42C works with an illustrated explanation and practical readings.

TIP42C at a glance

Follow the labeled connections and functional stages

TIP42C working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Establish base current

Pull base below emitter through the resistor.

Step 2 / 3

Control the load path

Conventional current flows from emitter to collector.

Step 3 / 3

Release the base charge

The base-emitter return defines off; switching speed depends on drive and stored charge.

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