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How do you remember PNP and NPN?


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NPN and PNP varieties of bipolar junction transistors are both available. This article aims to clarify the distinctions between these two categories and demonstrate how to apply them to a circuit. Additionally, comprehending 3 wire sensor connections will be made easier thanks to this automation engineer and instrumentation engineers.

N-type and p-type semiconductors are combined to create transistors. Electron acceptor atoms are carried by the p-type semiconductors, while electron donor atoms are carried by the n-type semiconductors (holes).

Negative Positive Negative, or NPN, transistors. consists of a p-type semiconductor in the center and two n-type semiconductor areas on either side.

To remember PNP and NPN, one should generally follow the code:

  1. PNP – Pointed In
  2. NPN – Not Pointed In

or in another way to remember the direction is by the following:

  1. PNP – Points in Permanently
  2. NPN – Never Points in

For understanding, learn the way connected to the figure shown below


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