MJE2955T: Overview,parameter,Main uses,Features,application fields,working principle and alternative models

MJE2955T Transistor Detailed Introduction:


The MJE2955T is a high-power PNP bipolar junction transistor (BJT) used in general-purpose amplification and switching applications where higher current and power handling capabilities are required.



  • Collector Current (Ic): Maximum current passing through the collector.
  • Collector-Emitter Voltage (Vceo): Maximum voltage capacity between collector and emitter.
  • Power Dissipation (Pd): Maximum power the transistor can dissipate.
  • DC Current Gain (hFE): Amplification factor of the transistor.
  • Transition Frequency (ft): Frequency at which the current gain becomes unity.
  • DataSheet MJE2955T PDF

Main Uses:

  • Amplification: Utilized in audio amplifiers, power supplies, and driver circuits.
  • Switching Applications: Controlling high-power loads like motors, relays, and solenoids.
  • Voltage Regulation: Essential component in linear voltage regulator circuits.
  • Power Control: Managing power levels in various electronic systems.


  • High Power Handling: Capable of handling substantial currents and power levels.
  • TO-220 Package: Common packaging for thermal management and easy mounting.
  • Robust Design: Built for reliable performance in high-power applications.
  • Versatile Applications: Suitable for multiple types of amplification and switching tasks.
  • Thermal Protection: Efficient heat dissipation design for extended operation.

Application Fields:

  • Power Supplies: Found in linear and switching power supply circuits.
  • Audio Amplifiers: Powering audio systems and amplifying signals.
  • Motor Control: Driving motors and controlling their speed.
  • Industrial Electronics: Used in various power control and amplification systems.

Working Principle:

  • Amplification: Increases the amplitude of signal voltages or currents.
  • Switching: Controls conduction between collector and emitter based on base input.
  • Continuity: Ensures proper current flow between terminals as per the circuit requirements.

Alternative Models:

  • TIP2955: Similar PNP high-power transistor with complementary characteristics.
  • MJE3055T: Offers comparable power handling capabilities in a TO-220 package.
  • MJL2955: Higher power PNP transistor with enhanced characteristics for demanding applications.

The MJE2955T transistor is a robust component commonly employed for high-power amplification and switching duties in electronic circuits. Alternative models like the TIP2955 and MJE3055T provide similar functionality with slight variations in performance parameters, offering designers flexibility in choosing components based on specific project requirements. Refer to datasheets and technical documentation for in-depth specifications and application guidelines for these transistors.

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