Question

Why npn transistor is preferred over pnp?

Answer 1

The majority charge carriers in an NPN transistor are electrons and for a PNP transistor, holes. Electrons have greater mobility than holes, thus making the circuit response faster when an NPN transistor is used.

Also, generally while designing a circuit we go for negative grounding. If a PNP transistor is used, then the positive terminal has to be grounded. This leads to a lot of confusion.

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