L293DN

Overview

The L293DN is a monolithic integrated high-voltage, high-current four-channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads. It features two H-bridge configurations with separate enable inputs for each pair of channels. The device includes internal clamp diodes for switching power transistors and offers overtemperature protection. It supports a supply voltage range from 4.5 V to 36 V, with an output current capability of 1 A per channel and a peak non-repetitive current of 1.2 A. The component operates within a temperature range of 0°C to +70°C and is housed in a 16-pin PDIP package.

Feature Summary

• Integrates two independent H-bridge drivers for bidirectional control of inductive loads
• Includes internal clamp diodes to protect against inductive kickback
• Features overtemperature protection circuitry for enhanced reliability
• Provides separate logic and motor supply inputs for noise isolation

Applications

• Driving DC motors and stepping motors
• Actuating relays and solenoids
• Switching power transistors in industrial control systems
• General-purpose motor control in automation equipment

Procurement Notes

Verify the manufacturer origin, as L293D variants are produced by multiple vendors including Texas Instruments and STMicroelectronics. Confirm the specific suffix indicates the correct package type and thermal characteristics. Ensure the component meets the required operating temperature range for your specific application environment before finalizing procurement.

Selection Notes

Select this component when a dual H-bridge configuration is required for controlling two DC motors or one stepper motor. Consider the 1 A continuous current limit and the need for external heatsinking if operating near maximum ratings. Verify that the logic input voltage levels match your microcontroller outputs, as the device accepts standard DTL or TTL levels.

Part Context

The L293D series is a widely used family of motor driver ICs known for their robustness in driving inductive loads. The L293DN specifically refers to the through-hole DIP package variant. This part serves as a fundamental building block for embedded motor control applications, offering a balance of performance and ease of integration into digital logic circuits.

Replacement Considerations

L293DR (Texas Instruments, Tape & Reel)

FAQ

Does the L293DN include built-in flyback diodes?

Yes, the L293DN includes internal clamp diodes connected across the outputs to handle inductive kickback from loads such as motors and relays.

What is the maximum peak output current per channel?

The maximum non-repetitive peak output current per channel is 1.2 A.