BC517 General Purpose NPN Darlington Transistor – TO-92 Package

The BC517 is a high-gain NPN Darlington transistor designed for switching and amplification applications where very high current gain is required. Internally, it consists of two NPN transistors connected in a Darlington configuration, providing exceptional amplification with minimal base drive current. The compact TO-92 package makes it suitable for relay drivers, sensor interfaces, LED control circuits, automation systems, and general-purpose electronic projects.

Key Features -

• NPN Darlington transistor

• Extremely high DC current gain (hFE)

• Suitable for switching and amplification applications

• Low base current requirement

• Built-in base-emitter resistor

• Compact TO-92 through-hole package

• Reliable and stable operation

Specifications -

• Product type - Darlington Bipolar Junction Transistor (BJT)

• Part number - BC517

• Transistor polarity - NPN

• Configuration - Darlington Pair

• Package type - TO-92

• Mounting type - Through Hole

• Number of pins - 3

• Collector-Emitter Voltage (VCEO) - 30V

• Collector-Base Voltage (VCBO) - 40V

• Emitter-Base Voltage (VEBO) - 10V

• Maximum Collector Current (IC) - 500mA

• Power Dissipation - 625mW

• DC Current Gain (hFE) - Up to 30,000

• Operating Temperature Range - -55°C to +150°C

Applications -

• Relay driver circuits

• LED driver applications

• Sensor interface circuits

• Alarm and security systems

• Automation and control systems

• Low-current to high-current switching applications

• Educational and DIY electronics projects