How to Control DC Motors Using the L293D Motor Driver IC

FREE-SKY (HK) ELECTRONICS CO.,LIMITED / 06-09 21:34

Controlling a motor with a microcontroller is not as simple as connecting it directly to an output pin. Most microcontrollers cannot provide enough current to drive motors safely, and attempting to do so may damage the circuit. The L293D is one of the most widely used motor driver ICs use in this situation. In this article, you will learn what the L293D is, how it works internally, its key specifications, pin functions, Arduino interfacing process, and more.

Catalog

1. L293D Dual H-Bridge Motor Driver IC

2. Key Features and Specifications

3. L293D Pinout Details and Functions

4. L293D Functional Block Diagram

5. L293D Arduino Interface Process

6. L293D vs Other Motor Driver ICs

7. Typical Applications and Use Cases

8. Mechanical Dimensions

9. Manufacturer

L293D Dual H-Bridge Motor Driver IC

The L298N

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Driver Type	Dual H-Bridge	Dual H-Bridge	Dual H-Bridge	Dual H-Bridge	Full H-Bridge
Motor Supply Voltage	4.5 V to 36 V	5 V to 46 V	4.5 V to 13.5 V	2.7 V to 10.8 V	5.5 V to 27 V
Logic Voltage	4.5 V to 7 V	5 V	2.7 V to 5.5 V	2 V to 7 V	3.3 V to 5 V
Continuous Output Current	600 mA/channel	2 A/channel	1.2 A/channel	1.5 A/channel	43 A
Peak Output Current	1.2 A/channel	3 A/channel	3.2 A/channel	2 A/channel	55 A
Internal Protection Diodes	Yes	No	Yes	Yes	Yes
Thermal Protection	Yes	Yes	Yes	Yes	Yes
PWM Support	Yes	Yes	Yes	Yes	Yes
Output Technology	Bipolar Transistors	Bipolar Transistors	MOSFET	MOSFET	MOSFET
Efficiency	Low	Low	High	High	Very High
Voltage Drop	High (≈1.2–1.8 V per side)	High (≈2–4 V total)	Low (<0.5 V typical)	Low (<0.4 V typical)	Very Low
Heat Generation	High	High	Low	Low	Low
External Heatsink Required	Usually Not	Often Required	Rarely Required	Rarely Required	Required at High Current
Number of DC Motors	2	2	2	2	1 High-Power Motor
Best For	Small DC Motors, Education Projects	Medium-Power Motors	Robots, Battery Devices	Compact Portable Designs	High-Power Motors and Robotics

Typical Applications and Use Cases

Educational and Arduino Projects

The L293D is widely used in educational projects and Arduino-based learning platforms. Its simple interface allows beginners to control DC motors and learn basic concepts such as motor direction control, PWM speed control, and H-bridge operation without requiring complex circuitry.

Small Mobile Robots

Many small robotic vehicles use the L293D to drive two DC motors independently. This allows the robot to move forward, reverse, turn left, and turn right by controlling the direction and speed of each motor separately.

Stepper Motor Control

The dual H-bridge architecture of the L293D can be used to control bipolar stepper motors. By energizing the motor coils in a specific sequence, the driver enables precise step-by-step movement for positioning applications.

Relay and Solenoid Driving

The L293D can drive relays and solenoids that require more current than a microcontroller output pin can provide. Its built-in protection diodes help suppress voltage spikes generated when these inductive loads are switched.

Automated Control Systems

In simple automation systems, the L293D is used to control small actuators, valves, and mechanical devices. The driver provides an easy way to interface logic circuits with electromechanical loads.

Mechanical Dimensions

Manufacturer

STMicroelectronics is one of the world's leading semiconductor manufacturers, with decades of experience in designing and producing analog, power management, motor control, and mixed-signal integrated circuits. For products such as the L293D motor driver IC, STMicroelectronics uses mature semiconductor manufacturing processes to ensure consistent electrical performance, reliability, thermal stability, and long-term product availability. Its manufacturing capabilities are supported by extensive research and development resources, automated production systems, and compliance with international quality and environmental standards.