ULN2803 – 8-Channel Darlington Transistor Array

The ULN2803 integrates eight NPN Darlington pairs in a single package, making it ideal for driving high-current loads from low-level logic signals. It’s commonly used to interface microcontrollers (TTL, CMOS, PMOS/NMOS) with devices like relays, lamps, stepper motors, and printer hammers.

Key Features:

• 8 NPN Darlington transistor channels

• Output current: Up to 500 mA per channel

• Output voltage: Up to 50 V

• TTL, DTL, PMOS, or CMOS-compatible inputs

• Built-in clamp diodes for inductive load protection

• Open-collector outputs

• Package: DIP-18

Applications:

• Relay and lamp drivers

• Stepper motor control

• LED matrix driving

• Printer hammer control

• Industrial and consumer electronics

*Image shown is a representation only.