L293D Motor Driver Board - Dual H-Bridge DC and Stepper Motor Controller for Arduino

Product Description The L293D Motor Driver Module is a versatile, high-voltage, and high-current 4-channel monolithic integrated motor controller. Designed to drive two DC motors or one 4-wire bipolar stepper motor, it utilizes a dual H-bridge circuit to control both the direction and speed of the connected motors. This module simplifies the interface between microcontrollers and inductive loads, featuring onboard 5V regulation and flyback diodes to suppress electrical noise. It is an industry-standard choice for DIY robotics, RC cars, and automated mechatronic systems where reliable bi-directional motor control is required from a single logic source.

Key Features

• Dual H-Bridge Configuration: Allows independent bi-directional control of two DC motors or synchronized control of one stepper motor.

• Integrated Flyback Diodes: Built-in diodes protect the internal circuitry and the microcontroller from back-EMF spikes generated by inductive loads.

• Wide Voltage Range: Capable of driving motors with voltages as low as 4.5V up to 36V, making it compatible with various battery packs.

• PWM Speed Control: Dedicated enable pins allow for Pulse Width Modulation (PWM) input to vary the rotation speed of the connected motors.

• Internal Shutdown Protection: Features thermal-shutdown circuitry to prevent the IC from permanent damage during heavy load or over-temperature conditions.

Technical Details

• Driver Architecture: Quadruple high-current half-H drivers combined into a dual-bridge system for maximum versatility.

• Output Capacity: Provides 600mA of continuous current per channel, with the ability to handle non-repetitive peak currents up to 1.2A.

• Logic Level Input: Fully compatible with standard TTL (5V) logic levels, ensuring a direct interface with Arduino Uno, Mega, and Nano.

• Separated Power Rails: Features distinct VCC (Logic) and VSS (Motor) pins to isolate the motor power noise from the control circuit.

• Heat Dissipation: The PCB is designed with thermal traces to help manage the heat generated by the L293D IC during high-torque operations.

• Screw Terminal Connections: Heavy-duty screw terminals for motor and power connections ensure secure wiring even in mobile robot chassis.

• Onboard Power LED: Includes a visual indicator to confirm the presence of logic power on the board for easier troubleshooting.

• Digital Input Pins: Four input pins (IN1-IN4) control the H-bridge state (Forward, Reverse, Brake, and Coast).

• High-Frequency Switching: Supports switching frequencies up to 5 kHz, allowing for smooth motor speed transitions via PWM.

• Input-to-Output Isolation: High insulation resistance ensures that high-voltage motor spikes do not travel back to the microcontroller pins.

• Operating Temperature: Maintains stable performance across standard industrial temperature ranges (-40°C to 150°C internal junction).

• Compact Footprint: Small form factor allows for integration into small robot chassis such as 2WD or 4WD smart car kits.

• Mounting Holes: Four M3 mounting holes are provided at the corners for secure mechanical fastening to the project base.

• Logic Compatibility: Low input current requirements ensure that it does not strain the GPIO pins of connected microcontrollers.

• Standard Header Pitch: 2.54mm pitch for logic inputs makes it compatible with all standard jumper wires and breadboards.