2N3055: Overview,Specifications,Main uses,Features,application fields,working principle and alternative models

2N3055 Overview:

The 2N3055 is a widely used NPN power transistor known for its high power-handling capability and robust construction. It finds applications in power supply circuits, audio amplifiers, voltage regulators, and various other high-power electronic circuits. Here is an overview of the 2N3055 transistor, including specifications, main uses, features, application fields, working principle, and alternative models:



  • Type: NPN Bipolar Junction Transistor (BJT)
  • Package: TO-3
  • Maximum Collector-Base Voltage (V_CB): 100 V
  • Maximum Collector-Emitter Voltage (V_CE): 70 V
  • Maximum Collector Current (I_C): 15 A
  • Power Dissipation (Pd): Up to 115 W
  • Transition Frequency (f_T): 2.5 MHz
  • DataSheet 2N3055 PDF

Main Uses:

  • Power Amplification: Used in high-power audio amplifiers and in linear amplifier stages.
  • Power Regulation: Employed in voltage regulator circuits for stable power supplies.
  • Power Switching: Suitable for switching high currents in various applications.
  • Motor Control: Found in motor driver circuits due to its high current capability.


  • High Power Handling: Capable of handling high current and power levels.
  • Robust Construction: Designed for reliability in high-power applications.
  • Low Saturation Voltage: Efficient operation in power switching applications.
  • Good Thermal Conductivity: TO-3 package allows for effective heat dissipation.

Application Fields:

  • Power Supplies: Used in linear power supply circuits for voltage regulation.
  • Audio Amplification: Found in high-power audio amplifiers and PA systems.
  • Motor Control: Utilized in motor driver circuits for controlling high-current motors.
  • High-Power Switching: Employed in applications requiring high-current switching capabilities.

Working Principle:

  • In a BJT like the 2N3055, current flow between the collector and emitter terminals is controlled by the base current.
  • By modulating the base current, the transistor can amplify signals, switch high currents, or regulate voltages based on the circuit design.
  • The 2N3055 operates as a current-controlled device, with the collector current proportional to the base current.

Alternative Models:

  • MJ15003: High-power complementary NPN transistor to the 2N3055.
  • TIP3055: NPN power transistor with similar specifications.
  • MJL21193: High-power NPN transistor suitable for demanding applications.


  • The 2N3055 transistor is a workhorse component in high-power electronics due to its ruggedness and high current-handling capabilities.
  • When selecting an alternative model, ensure compatibility with the specific requirements of your circuit in terms of voltage, current, and power handling.

The 2N3055 NPN power transistor is a staple component in high-power electronic circuits, offering robust performance in applications where high current and power handling are critical. It is commonly utilized in power supplies, audio amplifiers, motor control circuits, and other applications requiring high-power amplification or switching capabilities.

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