STMicroelectronics

BD679A

BD679A Description

The BD679A from STMicroelectronics is a high-performance NPN Darlington transistor designed for demanding power amplification and switching applications. With a collector-emitter voltage (Vce) rating of 80V and a maximum collector current (Ic) of 4A, this device is engineered to deliver robust performance in high-power circuits. Its Darlington configuration ensures high current gain (hFE ≥ 750 @ 2A, 3V), making it ideal for driving heavy loads with minimal base current. The transistor operates reliably at junction temperatures up to 150°C, ensuring stability in thermally challenging environments. Packaged in a SOT32-3 through-hole format, the BD679A is RoHS3 compliant and REACH unaffected, meeting modern environmental standards.

BD679A Features

• High Voltage & Current Handling: Supports 80V Vce and 4A Ic, suitable for power applications.
• Low Saturation Voltage: 2.8V max @ 40mA, 2A, reducing power losses in switching.
• High DC Current Gain (hFE): 750 min @ 2A, 3V, enabling efficient signal amplification.
• Wide Operating Temperature: -55°C to 150°C (TJ), ensuring reliability in harsh conditions.
• Low Leakage Current: 500µA max cutoff current, enhancing energy efficiency.
• Robust Packaging: SOT32-3 through-hole, providing mechanical durability.
• Compliance: RoHS3, REACH Unaffected, EAR99, meeting global regulatory standards.

BD679A Applications

The BD679A excels in high-power switching and amplification scenarios, including:

• Motor Drivers: Efficiently controls DC motors in industrial and automotive systems.
• Power Supplies: Acts as a switch or regulator in linear and switching PSUs.
• Audio Amplifiers: Delivers high gain in audio output stages.
• Relay/ Solenoid Drivers: Handles inductive loads with minimal voltage drop.
• LED Drivers: Supports high-current LED arrays in lighting systems.

Conclusion of BD679A

The BD679A stands out as a high-reliability Darlington transistor for power-intensive applications. Its high voltage/current ratings, low saturation voltage, and superior thermal performance make it a preferred choice over standard NPN transistors. Whether in motor control, power management, or amplification, the BD679A offers efficiency, durability, and compliance with industry standards, making it a versatile solution for engineers.