BD681 NPN Darlington Power Transistor (100V, 4A, TO 126, 1 Qty)

The BD681 Silicon NPN Darlington Power Transistor is a high gain bipolar transistor designed for power switching, amplification and electronic driver applications. Featuring a maximum collector emitter voltage of 100V, continuous collector current capability of 4A and a minimum DC current gain of 750 under specified test conditions, this transistor is suitable for controlling medium power electrical loads in industrial and electronic circuits.

The BD681 transistor features a Darlington configuration consisting of two internally connected NPN transistors, providing high current amplification with relatively low base drive requirements. Its silicon epitaxial base construction supports reliable operation in relay drivers, motor control circuits, power switching systems and amplifier stages. The TO 126 package allows through hole PCB mounting and heat dissipation with appropriate thermal management. Due to its Darlington construction, the transistor has a higher base emitter voltage and saturation voltage than a conventional single NPN transistor.

Key Features -

• BD681 silicon NPN Darlington power transistor

• Maximum collector emitter voltage of 100V

• Continuous collector current rating of 4A

• Minimum DC current gain of 750 under specified conditions

• High current amplification using Darlington configuration

• TO 126 through hole transistor package

• Suitable for medium power switching and driver circuits

• Low base drive current requirement compared with conventional NPN transistors

• Suitable for industrial and electronic control applications

Specifications -

• Part Number: BD681

• Product Type: Power Transistor

• Transistor Type: NPN Darlington Bipolar Junction Transistor

• Semiconductor Material: Silicon

• Construction Type: Epitaxial Base

• Collector Emitter Voltage (VCEO): 100V Maximum

• Continuous Collector Current (IC): 4A Maximum

• Minimum DC Current Gain (hFE): 750 Under Specified Test Conditions

• Transistor Configuration: Darlington Pair

• Package Type: TO 126

• Mounting Type: Through Hole

• Number of Terminals: 3

• Terminal Configuration: Base, Collector and Emitter

• Control Type: Current Driven

• Operating Mode: Switching and Amplification

• Thermal Management: Heat Sink May Be Required Depending on Power Dissipation

• Application Type: Power Switching and Driver Circuits

• Pack Quantity: 1 Qty (1 Piece)

Applications -

• Relay and solenoid driver circuits

• DC motor switching and control systems

• Industrial automation and control equipment

• Power switching and load driver circuits

• Audio amplifier and power driver stages

• Electronic power supply circuits

• Microcontroller controlled switching with suitable driver circuitry

• DIY electronics and engineering projects