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.
Rugged TO-3 Metal Case: Provides superior heat dissipation compared to plastic packages.
High Current Capability: Handles up to 15A continuous collector current (I_C).
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.
| Feature | Specification |
| Transistor Type | NPN |
| Package | TO-3 (Metal Can) |
| Collector-Emitter Voltage (V_{CEO}) | 60V |
| Collector-Base Voltage (V_{CBO}) | 100V |
| Continuous Collector Current (I_C) | 15A |
| Total Power Dissipation (P_D) | 115W |
| DC Current Gain (h_{FE}) | 20 to 70 |
| Operating Temperature | -65C to +200C |
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.
Inverters: Simple DIY DC-to-AC conversion circuits.
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