There are numerous differences between NPN and PNP transistors, even though both are bipolar junction transistors. There are applications which make use of transistors as a device-switch and amplifier. In a PNP transistor, the majority charge carriers are holes while in NPN, the majority charge carriers are electrons.
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NPN and PNP Transistor
What is the Difference Between NPN and PNP Transistors?
PNP switches ON by a low signal whereas NPN switches ON by a high signal. In PNP transistors, the P represents the polarity of the emitter terminal and N represents the polarity of the base terminal.
In NPN, N represents the negatively charged coating of the material whereas P represents the positively charged layer.
Difference Between NPN and PNP Transistor
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| The current flows from collector terminal to emitter terminal. | The current flows from emitter to collector terminal. |
| One P-type semiconductor is sandwiched between the two N-type semiconductors. | It is made of up two P-type material layers with N-type sandwiched between them. |
| The current flow from the collector is generated by keeping a +ve voltage there. | The current flow from the emitter to collector is generated at emitter terminal by keeping a +ve voltage there. |
| The transistor switches ON with the increase in current in the base terminal | The transistors switch ON when there is no current flow at the base terminal |
| When the current is reduced in the base, the transistor doesn’t function across the collector terminal and switches OFF | When a current is present at the base of a PNP transistor, then the transistor switches OFF. |
These are some of the NPN and PNP transistor differences. If you wish to find out more, download BYJU’S – The Learning App.
Frequently Asked Questions – FAQs
What is bipolar junction transistor?
What are the types of bipolar junction transistor?
Types of bipolar junction transistors are:
- PNP bipolar junction transistor
- NPN bipolar junction transistor
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