2N2955

The 2N2955 is a silicon NPN power transistor manufactured by Texas Instruments and others. It is designed for general-purpose power amplification and switching applications. The device features a complementary pair with the 2N2222, making it suitable for push-pull configurations. Its specifications include a maximum collector current of 600 mA and a maximum collector-emitter voltage of 60 V. The transistor has a DC current gain (hFE) typically ranging from 100 to 300. It is packaged in a TO-5 metal can, which allows for efficient heat dissipation. The 2N2955 was a popular choice for audio amplifiers, power supplies, and relay drivers in the past due to its robustness and availability. While newer, more efficient transistors exist, the 2N2955 can still be found in some legacy equipment and educational kits. Its relatively low cost and straightforward characteristics made it a workhorse in early semiconductor electronics. The transistor's operating junction temperature is rated up to 150 °C.