2N3055 NPN Power Transistor TO-3 Metal Package

2N3055 NPN Power Transistor TO-3 Metal Package

The 2N3055 is a high-power NPN silicon transistor widely used for power amplification and switching applications. Known for its rugged construction, high current handling, and excellent thermal stability, it is one of the most popular and reliable transistors ever made.

Housed in a TO-3 metal package, the 2N3055 offers superior heat dissipation, making it ideal for use with large heatsinks in demanding environments. It is commonly used in audio power amplifiers, voltage regulators, inverters, and power supply circuits.

The transistor delivers a collector current up to 15A and can handle voltages up to 60V, making it suitable for medium to high power stages. Its low saturation voltage and moderate gain ensure efficient switching and linear amplification.

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Key Features:

• Transistor Type: NPN Power Transistor
• Collector–Emitter Voltage (Vce): 60V
• Collector–Base Voltage (Vcb): 100V
• Emitter–Base Voltage (Veb): 7V
• Collector Current (Ic): 15A continuous
• Power Dissipation (Ptot): 115W at 25°C case temperature
• DC Current Gain (hFE): 20 – 70 (at Ic = 4A, Vce = 4V)
• Transition Frequency (fT): 2.5 MHz typical
• Junction Temperature (Tj max): 200°C
• Package Type: TO-3 Metal
• Mounting Style: Through-hole, with flange for heatsink mounting
• Lead Configuration:
• Pin 1 – Base
• Pin 2 – Emitter
• Case – Collector

Advantages:

• Excellent thermal conductivity due to TO-3 metal package
• High reliability and rugged mechanical design
• Low saturation voltage for high efficiency
• Suitable for both linear and switching applications
• Long-standing, industry-standard component

Typical Applications:

• Audio power amplifiers (output stage)
• DC and linear voltage regulators
• Power inverters and converters
• Motor control and drive circuits
• Relay and solenoid drivers
• Power supply output stages
• Educational and experimental electronics projects

2n3055-transistor-datasheet