The ULN2004 is a high-voltage, high-current Darlington transistor array designed for interfacing logic-level circuits to higher-power loads. Manufactured by Toshiba, this IC contains seven open-collector Darlington pairs with built-in clamp diodes, making it ideal for driving inductive loads such as relays, solenoids, and stepper motors.

Key Features

• High Current Drive: Each Darlington pair supports up to 500mA output current.
• High Voltage Tolerance: Handles up to 50V for each output.
• Integrated Clamp Diodes: Protects against inductive kickback, ensuring safe operation.
• Low Input Current: TTL and CMOS compatible, requiring minimal input drive current.
• Wide Application Range: Suitable for relay drivers, LED drivers, motor drivers, and other high-power applications.

Package Includes

• 1 x IC ULN2004 Toshiba – Darlington Transistor Array

Specifications

• Model Number: ULN2004
• Manufacturer: Toshiba
• Number of Channels: 7
• Output Type: Open Collector
• Output Current: 500mA per channel
• Output Voltage: 50V (max)
• Input Voltage: 5V – 15V (CMOS/TTL Compatible)
• Diode Suppression: Built-in Clamp Diodes
• Package Type: DIP-16 (Dual In-line Package)
• Operating Temperature: -40C to +85C

Usage Instructions

• Power Supply: Connect Vcc (Pin 9) to the appropriate logic voltage level.
• Input Control: Apply control signals to inputs (Pins 1-7) to activate corresponding outputs (Pins 10-16).
• Driving Inductive Loads: For relay and motor driving applications, ensure proper flyback diode connections.

Datasheet

For more technical details, please refer to the official datasheet:

Download ULN2004 Toshiba Datasheet (PDF)