How to Differentiate Between PNP & NPN Transistors [With Video]
It’s often Electronics and Communication engineering student get’s confused with the PNP and NPN transistors. Both of them are bipolar junction transistors. Also known as BJT transistor in short. PNP and NPN transistors are the basic electronics devices components that are widely used in numerous electronics and electrical project. The major function of these transistors is to amplify the current.
Usually, these BJT transistors are used in amplifiers, oscillators, switches and so on. These transistors are found in integrated circuits or also in discrete components. Electrons are the majority of charge carriers in NPN transistor whereas holes are the major charge carriers in PNP transistors. But note that field transistor has only one type of charge.
The fundamental difference between PNP and NPN transistor is when there is the flow of current through the base of transistor NPN transistor turns on. In NPN transistor there is a flow of current from the collector (C) to the emitter (E). But PNP transistor turns ON without current at the base of the transistor. In PNP, the flow of current is from the emitter (E) to the collector (C). The mechanism is just the opposite. Thus, one can conclude that to turn on the NPN transistor high charge or current is required while for PNP with low current also it can be turned on.
Difference Between PNP and NPN (source: ibiblio)
To know the more difference between the PNP and NPN transistor watch the video below.
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