BD681 Transistor TO-126 YFW Darlington Transistors ROHS 681 YFW BD681

Product Overview

A power Darlington transistor designed for general-purpose amplifier and low-speed switching applications. By integrating two transistors in a monolithic Darlington configuration, it achieves exceptionally high current gain ($h_{FE}$) from a minimal base input current. Housed in a through-hole TO-126 package, it offers a compact footprint with excellent thermal performance, making it highly reliable for driving medium-power loads such as small motors, relays, solenoids, and high-power LEDs.

Core Specifications

• Manufacturer: YFW (Yuefang Technology)

• Package Type: TO-126 (Through-Hole)

• Component Type: NPN Silicon Power Darlington Transistor

• Voltage Rating ($V_{CEO}$): 100V

• Voltage Rating ($V_{CBO}$): 100V

• Current Rating ($I_C$): 4A (Continuous)

• Peak Current Rating ($I_{CM}$): 8A

• Power Dissipation ($P_{tot}$): 40W (at $T_C = 25^\circ C$)

• DC Current Gain ($h_{FE}$): > 750 (Minimum @ $I_C = 1.5A, V_{CE} = 3V$)

• Compliance: RoHS Compliant

• Marking Code: 681

• Part Number: BD681