ULN2803 Darlington Transistor Arrays IC DIP 18 Package

ULN2803 Darlington Transistor Arrays IC DIP 18 Package 

The ULN2803 is a high-current Darlington transistor array IC designed to interface low-level logic circuits with higher-power loads. It contains eight NPN Darlington transistor pairs with open-collector outputs, allowing it to drive relays, solenoids, motors, lamps, and LED displays directly from TTL or CMOS logic signals.

Each channel includes a built-in flyback (clamp) diode for safe switching of inductive loads, reducing the need for external protection components. Packaged in a DIP-18 through-hole package, the ULN2803 is easy to use in prototyping, educational, and industrial control applications.

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Features

• Eight NPN Darlington transistor channels
• High current output capability (up to 500 mA per channel)
• Output voltage rating up to 50 V
• Built-in clamp diodes for inductive load protection
• Logic-level compatible inputs (TTL/CMOS)
• Open-collector outputs
• Common emitter configuration
• Low input current requirement
• DIP-18 package for easy PCB mounting and prototyping

Applications

• Relay and solenoid drivers
• DC motor and stepper motor control
• LED and lamp driving
• Display segment and matrix drivers
• Industrial automation and control systems
• Microcontroller and logic IC interfacing
• Robotics and embedded systems

uln2803-ic-datasheet