The 2N3055 is a silicon Epitaxial-Base Planar NPN transistor mounted in a Jedec TO-3 metal case. It is intended for a wide variety of high-power applications. Its ability to handle up to 15 Amperes of current and dissipate up to 115 Watts makes it a staple for bench power supplies, heavy-duty DC motor speed controllers, and classic high-fidelity audio power amplifiers. If you need a transistor that can survive high-stress environments where modern plastic components might fail, the 2N3055 is your go-to.
Key Features
Rugged TO-3 Metal Case: Provides superior heat dissipation compared to plastic packages.
High Current Capability: Handles up to 15A continuous collector current (IC).
Linear Performance: Excellent gain linearity, making it ideal for high-quality audio amplification.
Venerable Reliability: A time-tested design used in industrial and hobbyist projects worldwide.
Easy Mounting: The metal case acts as the Collector, allowing for direct mounting to large heatsinks.
Technical Specifications
Feature
Specification
Transistor Type
NPN
Package
TO-3 (Metal Can)
Collector-Emitter Voltage (VCEO)
60V
Collector-Base Voltage (VCBO)
100V
Continuous Collector Current (IC)
15A
Total Power Dissipation (PD)
115W
DC Current Gain (hFE)
20 to 70
Operating Temperature
-65°C to +200°C
Popular Use Cases
Variable DC Power Supplies: The “pass” transistor of choice for LM317 or 7805 current boosters.
Audio Power Amps: Famous for the “warm” sound in vintage 100W amplifiers.
Solenoid & Relay Drivers: Handling heavy inductive loads with ease.
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