BD679 NPN Power Darlington Transistor 80V 4A TO-126 Package

BD679 NPN Power Darlington Transistor 80V 4A TO-126 Package

The BD679 is a high-current NPN Darlington transistor designed for medium-to-high power amplification and switching applications. With a collector-emitter voltage of 80V and a collector current of up to 4A, it provides high current gain, low saturation voltage, and excellent thermal stability.

Housed in a TO-126 package, the BD679 offers efficient heat dissipation, making it ideal for audio amplifiers, motor drivers, voltage regulators, and medium-to-high power switching circuits. Its Darlington configuration ensures enhanced current amplification, allowing it to drive moderate-to-heavy loads reliably in industrial, educational, and hobbyist projects.

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Features:

• Transistor Type: NPN Silicon Darlington
• Package: TO-126 (medium-power, thermally efficient)
• Collector-Emitter Voltage (V_CE): 80V
• Collector Current (I_C): 4A
• Power Dissipation (P_tot): Up to 80W (with proper heatsink)
• High Current Gain (hFE): 1000–5000 (typical for Darlington pair)
• Low Saturation Voltage: Efficient switching and amplification
• High Thermal Stability: Reliable operation under high current loads
• Durable & Reliable: Long-term professional and hobbyist use

Applications:

• Audio Amplifiers: High-gain driver and output stages
• Relay & Motor Drivers: Efficiently drives motors, relays, and solenoids
• Voltage Regulators: Provides stable voltage and current
• Switching Circuits: Medium-to-high power load switching with high amplification
• Darlington Amplification Circuits: High current gain for medium-to-high power applications
• Industrial, Educational & Hobby Projects: Ideal for experimentation and prototyping

bd679-transistor-datasheet