BD677 NPN Power Darlington Transistor (TO-126, 60V, 4A)

The BD677 is a silicon epitaxial-base NPN power Darlington transistor designed for switching, driver stages, and power control applications. Its high current gain enables a relatively small base current to control a larger collector current. The TO-126 through-hole package supports PCB mounting in electronic control circuits, actuator drivers, and general-purpose power switching applications. Suitable biasing and thermal management are essential for reliable operation.

Key Features -

• NPN silicon epitaxial-base power transistor

• Darlington configuration for high current gain

• Maximum collector-emitter voltage of 60V

• Maximum DC collector current of 4A, as specified

• TO-126 through-hole package

• Suitable for switching and driver circuits

• Designed for power control applications

Specifications -

• Product Type: Bipolar Junction Transistor (BJT)

• Part Number: BD677

• Transistor Polarity: NPN

• Transistor Configuration: Darlington

• Semiconductor Technology: Silicon Epitaxial Base

• Package Type: TO-126

• Mounting Type: Through Hole

• Number of Pins: 3

• Maximum Collector-Emitter Voltage (VCEO): 60V

• Maximum DC Collector Current (IC): 4A

• Maximum Collector Cut-Off Current: 200 uA, as specified; test conditions should be verified

• Power Dissipation (Pd): 40W, as specified; actual allowable dissipation depends on thermal conditions

• DC Current Gain (hFE): Verify according to the manufacturer's datasheet

• Pin Configuration: Verify according to the manufacturer's datasheet

Applications -

• Power switching circuits

• Relay and solenoid driver stages

• Motor and actuator control

• Electronic power control systems

• Industrial control equipment

• Embedded system output drivers

• Electronic repair and prototyping projects