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MJ2955

MJ2955 Description

The MJ2955 from STMicroelectronics is a high-power PNP bipolar junction transistor (BJT) designed for demanding applications requiring robust performance. Housed in a TO-3 package, it offers a collector-emitter voltage (Vce) rating of 60V and a maximum collector current (Ic) of 15A, making it suitable for high-current switching and amplification tasks. With a power dissipation capability of 115W and an operating junction temperature (TJ) of up to 200°C, this transistor excels in thermally challenging environments. Its low collector cutoff current (700µA max) and DC current gain (hFE) of 20 @ 4A, 4V ensure efficient operation in linear and switching configurations.

MJ2955 Features

• High Power Handling: 115W max power dissipation for heavy-duty applications.
• Robust Construction: TO-3 chassis-mount package ensures mechanical durability and efficient heat dissipation.
• Low Saturation Voltage: Vce(sat) of 3V @ 3.3A, 10A minimizes power loss in switching applications.
• Wide Temperature Range: Operates reliably up to 200°C (TJ).
• Compliance: ROHS3 and REACH unaffected, meeting environmental standards.
• High Current Gain: hFE of 20 @ 4A, 4V ensures stable amplification.

MJ2955 Applications

The MJ2955 is ideal for:

• Power Supplies: Linear regulators and high-current voltage regulation.
• Audio Amplifiers: Complementary output stages in high-fidelity audio systems.
• Motor Control: Driver circuits for DC motors and solenoids.
• Industrial Equipment: Relays, inverters, and other high-power switching systems.
• Automotive Systems: Ignition circuits and power management modules.

Conclusion of MJ2955

The MJ2955 stands out as a reliable, high-performance PNP transistor for power electronics, combining high current capacity, thermal resilience, and low saturation losses. Its TO-3 package and wide operating temperature range make it a preferred choice for industrial, automotive, and audio applications where durability and efficiency are critical. While marked as obsolete, its proven design continues to be valued in legacy and specialized systems.