ULN2004A

Description

The ULN2004A is a high-current Darlington transistor array designed to interface low-voltage logic circuits with higher power loads. Featuring seven open-collector outputs, each capable of sinking up to 500 mA, it simplifies the control of relays, lamps, stepper motors, and other inductive loads. The device includes built-in flyback diodes to protect against voltage spikes, ensuring reliable operation in inductive switching applications. Compatible with TTL and CMOS logic levels, the ULN2004A operates over a wide voltage range and comes in a compact 16-pin DIP package for easy through-hole mounting. It is widely used in industrial control systems, robotics, and automation projects requiring robust power switching.

Key Features

• 7 Darlington Transistor Outputs for high-current drive

• Open-Collector Outputs with built-in flyback diodes

• Each Channel Sinks up to 500 mA for heavy loads

• Compatible with TTL and CMOS Logic Levels

• Wide Operating Voltage Range

• Standard 16-Pin DIP Package for easy PCB integration

• Ideal for relay drivers, lamps, stepper motors, and industrial controls