ULN2003 Stepper motor driver

The ULN2003 is a high-voltage, high-current Darlington transistor array designed to drive various loads, including stepper motors, relays, and other high-power devices. It features seven Darlington pairs with common-emitter connections, making it ideal for interfacing between low-power control signals and high-power devices. The ULN2003 is commonly used in applications such as robotics, CNC machines, and industrial automation.

Key Features:

• 7 NPN Darlington pairs per package
• Output current (single output) up to 500 mA
• High-voltage outputs: up to 50V
• Integrated clamp diodes for inductive load driving
• Inputs compatible with TTL and 5V CMOS logic
• Built-in base resistors for easy interface with microcontrollers

Technical Specifications:

• Package Type: 16-pin DIP, SOIC
• Output Current: 500 mA per channel
• Output Voltage: 50V maximum
• Input Voltage: 5V TTL/CMOS compatible
• Clamp Diode: Yes (integrated)
• Pin Configuration: 7 Darlington pairs with common emitters
• Operating Temperature Range: -20°C to +85°C

Applications:

• Stepper motor driving
• Relay driving
• Lamp and LED displays
• Logic buffers
• Line drivers

Usage:

1. Connect the inputs of the ULN2003 to the control signals from a microcontroller or logic circuit.
2. Connect the outputs of the ULN2003 to the loads, such as the windings of a stepper motor.
3. Provide appropriate power supply to the motor or other loads.
4. Use appropriate software or control logic to drive the inputs, thereby controlling the connected loads.

Caution:

• Ensure proper heat dissipation if driving high currents through multiple channels.
• Verify correct power supply voltage and connections before powering the device.
• Follow the manufacturer’s guidelines for safe operation.

Datasheet: For detailed technical specifications, refer to the ULN2003 Datasheet.