12th November 2019

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What is PNP and NPN junction?

NPN and PNP transistors are bipolar junction transistors, and it is a basic electrical and electronic component which is used to build many electrical and electronic projects. The main difference between the NPN and PNP transistor is, an NPN transistor turns on when the current flows through the base of the transistor.

Besides, how does a PNP transistor function?

A PNP works in a same but opposite fashion. The base still controls current flow, but that current flows in the opposite direction – from emitter to collector. Instead of electrons, the emitter emits “holes” (a conceptual absence of electrons) which are collected by the collector.

What is the difference between NPN and PNP?

PNP sensors are sometimes called “sourcing sensors” because they source positive power to the output. NPN sensors are sometime called “sinking sensors” because they sink ground to the output. The term “load” identifies the device the sensor powers. The load could be a lamp, pneumatic valve, relay or PLC input.

What is the difference in PNP and NPN?

The main difference between the two types of transistors is that holes are the more important carriers for PNP transistors, whereas electrons are the important carriers for NPN transistors. Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.
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