BD678 PNP Medium Power Darlington Transistor (TO-126, 60V, 4A)

The BD678 is a PNP medium-power Darlington transistor designed for switching, driver stages, and power control applications. It features high current gain, allowing a relatively small base current to control a larger collector current. Housed in a TO-126 package, it is suitable for electronic control circuits, actuator drivers, and general-purpose power switching applications within its specified electrical and thermal limits.

Key Features -

• PNP medium-power Darlington transistor

• High current gain for efficient base drive

• Collector-emitter voltage rating of 60V

• Maximum collector current of 4A, as specified

• TO-126 through-hole package

• Suitable for switching and driver circuits

• Designed for power control and electronic switching applications

Specifications -

• Product Type: Bipolar Junction Transistor (BJT)

• Part Number: BD678

• Transistor Polarity: PNP

• Transistor Configuration: Darlington

• Package Type: TO-126

• Mounting Type: Through Hole

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

• Maximum Collector Current (IC): 4A

• Power Dissipation (Pd): 40W DC, as provided; actual allowable dissipation depends on thermal conditions and datasheet ratings

• DC Current Gain (hFE): 750, as provided

• Number of Pins: 3

• Pin Configuration: Verify using the manufacturer's datasheet

Applications -

• Medium-power switching circuits

• Relay and solenoid driver stages

• Motor and actuator control

• Power control circuits

• Industrial electronic equipment

• Embedded system output drivers

• General-purpose electronic switching projects