2N2222 NPN Transistor TO-92 2N2222A General Purpose Switching and Amplification Transistors Pack of 50 High Gain Linear and Digital Circuit Components

The 2N2222 NPN Transistor TO-92 2N2222A is an industry-standard silicon planar epitaxial NPN transistor packaged in a compact TO-92 casing. Designed primarily for high-speed switching applications and low-power medium-frequency amplification, this component is a staple in electronic workshops, educational labs, and professional prototyping environments. Whether you are building discrete logic circuits, interfacing microcontrollers with higher-power peripherals, or constructing analog amplifiers, the 2N2222A delivers reliable performance and exceptional versatility. Its robust thermal and electrical characteristics make it an essential addition to any electronics enthusiast or professional engineer inventory.

This transistor is engineered to handle a maximum collector-emitter voltage (VCEO) of 40V and a continuous collector current (IC) of up to 600mA, allowing it to interface directly with numerous digital logic families and peripheral devices. The DC current gain, designated as hFE, is specified across a wide range of collector currents, maintaining high linearity particularly around the 150mA operating point. The device features a fast switching speed with typical turn-on and turn-off times in nanoseconds, which is facilitated by a high gain-bandwidth product (transition frequency fT) of 300 MHz. This ensures minimal signal distortion and rapid response times in pulse-width modulation (PWM) and digital switching topologies. The TO-92 package provides adequate thermal dissipation for standard low-power applications while maintaining a small footprint for high-density circuit board layouts.

Collector-Emitter Voltage (VCEO): 40 V. Collector-Base Voltage (VCBO): 75 V. Emitter-Base Voltage (VEBO): 6 V. Continuous Collector Current (IC): 600 mA. Total Device Dissipation (PD) at Ta = 25°C: 625 mW. Operating and Storage Junction Temperature Range (TJ, Tstg):

• 55°C to +150°C. DC Current Gain (hFE): 35 to 300 depending on operating conditions and bin classification. Transition Frequency (fT): 300 MHz minimum. Package Type: TO-92. Pin Configuration: Emitter (Pin 1), Base (Pin 2), Collector (Pin 3) from left to right with flat side facing the viewer.

The 2N2222A is exceptionally versatile and finds widespread use in various electronic circuits. Common applications include driving small DC motors, stepping motors, and inductive loads when paired with a flyback diode. It is frequently utilized for driving relay coils from microcontroller output pins (such as Arduino or Raspberry Pi GPIOs), controlling indicator LED arrays, and implementing signal modulation. Additionally, it serves in audio preamplifiers, oscillator circuits, multi-vibrators, and voltage regulation feedback loops where reliable switching and linear amplification are required.

When integrating the 2N2222A into your circuit designs, always verify the pinout configuration to prevent reverse-bias damage, noting that standard pinouts typically follow Emitter-Base-Collector when viewing the flat face with leads pointing downward. When driving inductive loads like relays or motors, it is critical to place a freewheeling diode across the load terminals to absorb high-voltage inductive kickback transients. Ensure that base current is properly limited using an appropriate series resistor to prevent excessive base-emitter current draw from your driving source. For thermal management in continuous high-current operations, ensure ambient temperature limits are respected to prevent exceeding the maximum junction temperature rating.

50 x 2N2222A NPN Transistors TO-92