Chapter 4

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Bipolar Junction Transistor

Base, Emitter, Collector

NPN: Not Pointing iN
PNP: Pointing iN Please
The arrow is for the emitter current. For an NPN the current flows into the collector. For a PNP the current flows out of the collector.

NPN Active Region

Base-emitter junction is forward biased
Base-collector junction is reverse biased

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