2N2222 NPN Transistor TO-92 2N2222A - General Purpose Switching and Amplification Transistors for Electronics Prototyping

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 current of 600 mA continuously, allowing it to drive a wide variety of low-voltage loads such as indicator LEDs, small DC motors, and electromagnetic relays. The device features a maximum collector-emitter voltage (VCEO) of 40V and a collector-base voltage of 75V, providing a safe operating margin for common low-voltage electronics projects. The DC current gain (hFE) is specified over a wide range of collector currents, reaching up to 300 at 150 mA, which ensures strong signal amplification capabilities. Furthermore, the high transition frequency of 300 MHz makes it exceptionally well-suited for high-frequency switching and RF applications where response time is critical.

• Transistor Type: NPN
• Package Type: TO-92
• Collector-Emitter Voltage (VCEO): 40 V
• Collector-Base Voltage (VCBO): 75 V
• Emitter-Base Voltage (VEBO): 6 V
• Collector Current (IC): 600 mA continuous
• DC Current Gain (hFE): 100 to 300 at IC = 150 mA
• Transition Frequency (fT): 300 MHz minimum
• Operating Junction Temperature:
• 55 to +150 degree Celsius

• General purpose switching and amplification
• Microcontroller GPIO load driving for relays and small motors
• Low-power audio and RF signal amplification
• Pulse and high-speed waveform generation circuits
• Educational electronics kits and breadboard prototyping

Ensure correct pinout identification before inserting the TO-92 package into breadboards or printed circuit boards, noting the emitter, base, and collector terminal arrangement from left to right when viewing the flat face with leads pointing downward. When driving inductive loads such as small DC motors or relays, always include a flyback diode across the load terminals to protect the transistor from voltage spikes caused by inductive kickback. Ensure operating current and voltage limits are strictly observed to prevent thermal runaway or permanent damage.

2N2222 NPN Transistors