2N3055 NPN Power Transistor TO-3 Metal Case
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Prices updated: 14 Oct 2026
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About this product
The 2N3055 is a general-purpose NPN power transistor in a TO-3 metal case, designed for high-current switching and linear power stages. It is a classic choice for linear power supply pass elements and audio amplifier output stages.
Specifications
- Transistor type
- NPN power
- Package
- TO-3 metal
- Max collector-emitter voltage (VCEO)
- 60 V
- Max collector current (IC)
- 15 A
- Max power dissipation (Ptot)
- 115 W
- Transition frequency (fT)
- 2.5 MHz min
Frequently asked questions
Does the 2N3055 need a heatsink?
Yes for any significant power dissipation. The collector is connected to the metal case, so an insulating washer is needed when mounting it on a grounded heatsink.
Can I drive a 2N3055 directly from a microcontroller pin?
No. Its current gain is modest at high collector currents, so it needs substantial base current. Use a driver transistor or a Darlington stage between the microcontroller and the 2N3055.
