L293N

Overview

The L293N is a quadruple half-H driver manufactured by Texas Instruments, designed for brushed DC motor and relay applications. It features four independent half-bridge drivers capable of delivering up to 1 A per channel with peak currents reaching 2 A. The device operates on a supply voltage range from 4.5 V to 36 V. It utilizes a 16-pin PDIP package for through-hole mounting. The component supports dual power supplies, allowing separate logic and motor voltage domains. It includes internal clamp diodes for inductive load protection.

Feature Summary

• Integrates four independent half-bridge drivers for versatile control configurations
• Supports bidirectional drive capability for brushed DC motors
• Features internal clamp diodes to protect against inductive voltage spikes
• Accepts standard 5-V TTL logic inputs for direct microprocessor interfacing

Applications

• Brushed DC motor speed and direction control
• Solenoid and relay driving circuits
• Industrial automation control systems
• General-purpose high-current switching applications

Procurement Notes

Verify the specific manufacturer source, as the L293N part number may be produced by multiple vendors including STMicroelectronics. Confirm that the received component matches the Texas Instruments datasheet specifications regarding pinout and electrical characteristics. Ensure the package type corresponds to the required 16-pin DIP form factor for your PCB layout.

Selection Notes

Select this component when a quadruple half-bridge configuration is required for low-to-medium current motor applications. It is suitable for designs needing isolated logic and motor power supplies. Consider thermal management requirements if operating near the maximum continuous current limits. Verify compatibility with the system's logic voltage levels before integration.

Part Context

The L293N belongs to the L293 series of quadruple half-H drivers. It serves as a robust interface between low-power logic controllers and higher-power actuators. This series is widely utilized in embedded systems requiring reliable motor control without complex discrete transistor arrangements. The device simplifies circuit design by integrating necessary protection diodes and driver stages into a single package.

Replacement Considerations

The SN754410 is a documented equivalent part number offering similar functionality and pinout compatibility. Verify mechanical dimensions and electrical tolerances when substituting components from different manufacturers.