2N3055 PDF – 60V, 15A, NPN Transistor – ST

Part Number: 2N3055

Function: 60V, 15A, Complementary Power NPN Transistor

Package: TO-3 Type

Manufacturer: STMicroelectronics


2N3055 transistor


A NPN transistor is a type of bipolar junction transistor (BJT) that consists of two n-type semiconductor materials separated by a single p-type material.

The NPN transistor is used to amplify or switch electronic signals and is widely used in many electronic circuits. It works by controlling the current flow between the collector and emitter terminals through the base terminal.

When a small current is applied to the base, it controls a much larger current between the collector and emitter, making the NPN transistor an effective amplifier or switch.

The 2N3055 and MJ2955 are complementary silicon power transistors manufactured by the epitaxial base process, mounted in a hermetically sealed metal case, designed for general purpose switching and amplifier applications. […]

2N3055 pdf datasheet transistor


• Low collector-emitter saturation voltage
• Complementary NPN – PNP transistors



2N3055 pinout

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 100 V

2. Collector to Emitter Voltage: Vceo = 60 V

3. Emitter to Base Voltage: Vebo = 7 v

4. Collector Current: Ic = 15 A

5. Total Dissipation : Pc = 115 W

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -65 ~ +200°C



1. Switching and amplifier

2. Power switching circuits

3. Amplifier circuits

4. PWM applications

5. Regulator circuits

6. Switch mode power supply

7. Signal Amplifiers

2N3055 PDF Datasheet

2N3055 pdf