2N2222 Transistor: Difference between revisions
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=== General Information === | === General Information === | ||
* | * '''Type:''' NPN Bipolar Junction Transistor | ||
* | * '''Application:''' General-purpose, switching, and amplification | ||
* | * '''Packaging:''' TO-18 (metal can) and TO-92 (plastic) | ||
=== Key Features === | === Key Features === | ||
| Line 35: | Line 35: | ||
=== Pin Configuration === | === Pin Configuration === | ||
The 2N2222 transistor has three pins, which are arranged as follows: | The 2N2222 transistor has three pins, which are arranged as follows: | ||
* | * '''Pin 1:''' Emitter | ||
* | * '''Pin 2:''' Base | ||
* | * '''Pin 3:''' Collector | ||
=== Applications === | === Applications === | ||
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=== Additional Resources === | === Additional Resources === | ||
* [https://en.wikipedia.org/wiki/Bipolar_junction_transistor Bipolar Junction Transistor - Wikipedia] | * [https://en.wikipedia.org/wiki/Bipolar_junction_transistor Bipolar Junction Transistor - Wikipedia] | ||
* [https:// | * [https://www.datasheetarchive.com/?q=2N2222 2N2222 on Datasheet Archive] | ||
Revision as of 06:51, 27 December 2024
2N2222 Transistor
The 2N2222 is a widely used NPN bipolar junction transistor (BJT). It is designed for low-power to medium-power applications, making it suitable for a variety of switching and amplification tasks. It is especially known for its robust performance and versatility in electronic circuits.
General Information
- Type: NPN Bipolar Junction Transistor
- Application: General-purpose, switching, and amplification
- Packaging: TO-18 (metal can) and TO-92 (plastic)
Key Features
- Medium power-handling capacity
- High-speed switching
- Versatile and robust design
- Widely used in analog and digital circuits
Specifications
| Parameter | Symbol | Value |
|---|---|---|
| Maximum Collector-Emitter Voltage | VCEO | 40 V |
| Maximum Collector-Base Voltage | VCBO | 75 V |
| Maximum Emitter-Base Voltage | VEBO | 6 V |
| Maximum Collector Current | IC | 800 mA |
| Power Dissipation | Ptot | 500 mW (TO-92), 800 mW (TO-18) |
| Transition Frequency | fT | 250 MHz |
| DC Current Gain (hFE) | hFE | 100–300 |
Pin Configuration
The 2N2222 transistor has three pins, which are arranged as follows:
- Pin 1: Emitter
- Pin 2: Base
- Pin 3: Collector
Applications
The 2N2222 transistor is used in a wide range of circuits, including:
- Signal amplification
- Medium-power switching
- Oscillator circuits
- Motor drivers
- Relay drivers
- RF circuits
Circuit Example
Simple Relay Driver Circuit A 2N2222 can be used to drive a relay:
- Connect the emitter to the ground.
- Connect the collector to one terminal of the relay coil.
- The other terminal of the relay coil is connected to a DC power supply.
- Add a flyback diode across the relay coil for protection.
- Apply a base current through a resistor to switch the relay on.
Advantages
- Medium-power capability
- High switching speed
- Versatile and widely available
- Rugged and reliable
Limitations
- Limited to medium-power applications
- Not suitable for very high-current or very high-voltage circuits
Common Alternatives
Other similar transistors include:
- 2N2907 (PNP counterpart)
- 2N3904
- BC547
