Tag npn
A popular topic!
What is an NPN Transistor?
An NPN transistor is a type of bipolar junction transistor (BJT) that consists of three layers: a negative base, a positive p-type collector, and an n-type emitter. The "NPN" acronym stands for "Negative-Positive-Negative".
How does an NPN Transistor work?
Here's a simplified explanation:
- Base: The base is the control terminal of the transistor. When a small current flows into the base, it allows the transistor to conduct.
- Collector: The collector is the output terminal of the transistor. When the base is biased, it allows current to flow from the emitter to the collector.
- Emitter: The emitter is the input terminal of the transistor. When the base is biased, it allows current to flow from the emitter to the collector.
How to use an NPN Transistor:
- Common Emitter Configuration: This is the most common configuration. The base is connected to a voltage source, and the collector is connected to a load (e.g., a light bulb). When the base is biased, the transistor conducts, and current flows from the emitter to the collector.
- Common Collector Configuration: In this configuration, the collector is connected to a voltage source, and the emitter is connected to a load. The base is still connected to a voltage source. This configuration is often used as an amplifier.
Common Applications of NPN Transistors:
- Switching: NPN transistors are often used as switches to control the flow of current in electronic circuits.
- Amplification: NPN transistors can be used as amplifiers to increase the voltage or current of a signal.
- Power Control: NPN transistors are used in power supplies, motor control circuits, and other applications where high current is required.
Some popular NPN Transistors:
- 2N3904
- 2N3906
- BC547
- BC557