2n2222 Transistor NPN

The 2N2222 is one of the most widely used NPN bipolar junction transistors in electronics. Structurally, it consists of a single P-doped layer sandwiched between two N-doped layers, forming the classic NPN configuration. As a current-controlled device, a small current injected into the base terminal controls a significantly larger current flowing between the collector and emitter. This makes it highly effective for both amplification and switching tasks. Its compact size, low cost, and reliable performance have made it a go-to choice for hobbyists, students, and professional engineers alike.

Specifications

• Transistor Type: NPN Bipolar Junction Transistor (BJT)
• Terminals: Emitter, Collector, Base
• Maximum Collector Current (Ic): 800 mA
• Power Dissipation: 500 mW
• Collector-Base Voltage (Vcb): 60 V
• Collector-Emitter Voltage (Vce): 30 V
• Emitter-Base Voltage (Veb): 5 V
• Operating Temperature Range: -65°C to +200°C
• Control Type: Current-controlled

Applications

• Used for current amplification in analog circuits.
• Functions as an electronic switch to automatically turn appliances ON or OFF.
• Employed in Pulse Width Modulation (PWM) circuits due to its fast response time.
• Commonly used in embedded systems and automation projects.
• Suitable for signal amplification in communication and audio circuits.
• Used in driver circuits for relays, LEDs, and small motors.