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What are the two types of bipolar junction transistor?

in Electrical Engineering

What are the two types of bipolar junction transistor?

1 Answer

The two types of Bipolar Junction Transistors (BJTs) are:

1. **NPN Transistor**:
   - In this type, a layer of *P-type* material (the base) is sandwiched between two layers of *N-type* material (the collector and emitter).
   - When a small current flows into the base, it allows a larger current to flow between the collector and emitter.

2. **PNP Transistor**:
   - In this type, a layer of *N-type* material (the base) is sandwiched between two layers of *P-type* material (the collector and emitter).
   - A small current flowing out of the base allows a larger current to flow from the emitter to the collector.

The main difference between the two types is the direction of current flow and the arrangement of N-type and P-type materials.

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