ULN2803A
Overview
The ULN2803A is an eight-channel Darlington transistor array designed for high-current, high-voltage switching applications. Each channel is rated for 500mA and 50V, making it a standard interface for driving inductive loads from low-power logic. It features integrated clamp diodes for transient suppression and a pinout that places inputs directly opposite outputs to simplify PCB routing.
Why Choose This Part
The through-hole 18-DIP package is ideal for prototyping and easy replacement in industrial environments. It consolidates eight discrete driver circuits into a single chip with built-in flyback protection, significantly reducing component count and board space compared to discrete BJT designs.
Applications
Key Specifications
Getting Started
Connect the GND pin to the logic ground and the COM pin to the positive load supply voltage to enable the internal suppression diodes. Since the inputs are compatible with TTL and 5V CMOS logic, they can be driven directly from an Arduino or Raspberry Pi GPIO. Ensure the total power dissipation does not exceed 2.25W when driving multiple channels simultaneously.
