The C2073 transistor, officially known as 2SC2073, is a high-performance NPN bipolar junction transistor (BJT) designed for medium-power switching and amplification. Known for its durability, reliability, and ease of use, it is widely used in audio amplifiers, power supplies, and general-purpose electronic circuits.
Whether you’re repairing consumer electronics or building your projects, the C2073 offers a solid balance of power handling, voltage tolerance, and thermal efficiency, all in a TO-220 package that simplifies mounting and cooling.
Key Features of the C2073
- NPN Silicon transistor
- High current handling: up to 4A
- Collector-Emitter voltage: up to 60V
- Maximum power dissipation: 40W (with proper heatsink)
- DC Current gain (hFE): 40 – 160
- Designed for efficient signal amplification and power switching
- TO-220 package with a metal tab for easy heatsinking
Technical Specifications of the C2073
| Parameter | Value |
| Transistor Type | NPN |
| Part Number | 2SC2073 / C2073 |
| Package Type | TO-220 |
| Collector-Emitter Voltage (Vceo) | 60V |
| Collector Current (Ic max) | 4A |
| Power Dissipation | 40W (with heatsink) |
| DC Gain (hFE) | 40 – 160 |
| Transition Frequency (fT) | 3 MHz |
| Operating Junction Temp | Up to 150°C |
Pin Configuration (TO-220)
- Pin 1 – Base (B)
- Pin 2 – Collector (C)
- Pin 3 – Emitter (E)
Applications
The C2073 transistor is ideal for a variety of electronic circuits, including:
- Audio power amplifiers (e.g., car audio systems)
- Switching regulators and converters
- Relay driver circuits
- Inverter circuits
- LED or motor driver applications
- Power supply regulation (SMPS)
Advantages
- Handles moderate current and voltage with ease
- Available in TO-220 for quick PCB installation and thermal management
- Compatible with a variety of NPN driver circuits
- Affordable and easy-to-source
- Can replace similar transistors in many commercial devices
Complementary & Equivalent Transistors
Complementary PNP Transistor:
- 2SA940 – used in push-pull amplifier designs
Equivalent or Substitute Transistors:
- TIP31C
- BD243C
- 2N6122
Note: Always cross-check pin configuration and electrical characteristics when replacing components.
Tips for Safe Operation
- Always mount the transistor on a heatsink for high-power applications
- Use a base resistor to control the input current when switching
- Keep the collector-emitter voltage and current within rated limits
- Avoid thermal overload – monitor heat during extended use
View the C2073 Datasheet
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