Recommended Reading: PNP Vs NPN: What Makes These Outputs Different

This is an excerpt from a recent educational article by Banner:

The difference between PNP and NPN is the construction of the semiconducting material found inside the transistor. In a PNP transistor, the semiconducting material is made of three layers: a negative (N) layer between two positive (P) layers: Positive-Negative-Positive, or PNP. Likewise, an NPN transistor has a positive layer sandwiched between two negative layers: Negative-Positive-Negative, or NPN. Despite their different construction, both forms have positive and negative power leads and are connected to a device called the load, such as an attached indicator light, hub or IO-Link master, PLC, etc.

To read the complete article, click on this link:


Julius Frago,
The Automation School

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