ULN2003A 7-Channel Darlington Transistor Array IC DIP-16 — 500mA / 50V, Relay & Stepper Driver

ULN2003A — 7-Channel Darlington Transistor Array, DIP-16

The ULN2003A is the world's most widely used driver IC for interfacing microcontrollers to high-current loads. Its 7 NPN Darlington channels each sink up to 500mA at 50V, with built-in flyback diodes on every output for inductive load protection. It is the standard driver for 28BYJ-48 stepper motors (the most popular Arduino stepper motor), relay boards, solenoids, and high-power LED arrays — all without external transistors or diodes.

The ULN2003A's inputs are directly compatible with 5V TTL and CMOS logic, making it a plug-and-play interface between Arduino GPIO pins and high-current loads. Its DIP-16 package is breadboard-compatible for easy prototyping.

Key Features

• 7 independent Darlington channels — each rated 500mA @ 50V
• Built-in flyback diodes on all outputs — relay and solenoid protection included
• 5V TTL/CMOS compatible inputs — direct connection to Arduino, ESP32, Raspberry Pi GPIO
• Active-low outputs — output sinks current when input is HIGH
• Standard driver for 28BYJ-48 stepper motor
• No external components required for basic relay/solenoid driving
• DIP-16 package — breadboard and through-hole PCB compatible
• RoHS compliant

Technical Specifications

Channels	7
Output Voltage (max)	50V
Output Current (per channel)	500mA continuous
Input Voltage (logic HIGH)	2.4V – 5V (TTL/CMOS compatible)
Flyback Diodes	Built-in on all 7 outputs
Output Type	Open-collector (active-low sink)
Package	DIP-16 (through-hole)
Manufacturer	Texas Instruments / STMicroelectronics / Toshiba

ULN2003A vs ULN2803A

• ULN2003A (this): 7 channels, DIP-16 — standard for 28BYJ-48 stepper motors, 7-segment displays, 7-relay boards
• ULN2803A: 8 channels, DIP-18 — preferred for 8-relay boards and full-byte I/O driving

Typical Applications

• 28BYJ-48 stepper motor driver — the standard driver IC for this popular Arduino stepper
• Relay board driver — drive 7 relays from a single IC with built-in flyback protection
• Solenoid valve array — control 7 solenoids from Arduino or PLC output
• High-power LED driver — drive 7 high-current LEDs or LED segments
• Common-anode 7-segment display digit driver
• Output expander — extend microcontroller I/O to drive 7 high-current loads

Package Contents

• 1 × ULN2003A 7-Channel Darlington Array IC (DIP-16)

ULN2003A Datasheet (Texas Instruments PDF)

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