L293D

Overview

The L293D is a monolithic integrated high voltage, high current four channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads such as relays, solenoids, DC motors, and stepping motors. It operates with a supply voltage range of 4.5 V to 36 V. Each channel provides an output current capability of 600 mA with a non-repetitive peak output current of 1.2 A per channel. The device features internal clamp diodes for noise immunity and overtemperature protection. It is assembled in a 16-lead plastic package with four center pins connected together for heatsinking.

Feature Summary

• Push-pull four channel driver architecture with enable facility for each pair of channels
• Internal clamp diodes included for switching power transistors and inductive loads
• Overtemperature protection circuitry integrated within the device
• High noise immunity with logical '0' input voltage up to 1.5 V

Applications

• Driving DC motors
• Driving stepping motors
• Switching relays and solenoids

Procurement Notes

Verify the specific package type and marking code against the official STMicroelectronics datasheet to ensure authenticity. Confirm that the component matches the 16-lead plastic package specification. Check for any obsolescence notices or lifecycle status updates directly from the manufacturer before finalizing procurement decisions.

Selection Notes

Select this component when standard DTL or TTL logic levels are available and moderate current driving is required. It is suitable for applications requiring two H-bridge configurations. Ensure thermal management is addressed due to the heatsink pin design. Verify that the operating frequency requirements do not exceed the specified limits for switching applications.

Part Context

The L293D belongs to the L293 series of motor drivers manufactured by STMicroelectronics. It is part of a broader portfolio of motor control solutions covering brushed DC, stepper, and brushless DC motors. This series is designed for industrial and consumer applications requiring robust motor control with integrated protection features.

Replacement Considerations

Consult official substitution guides for equivalent parts. Generic replacements may differ in pinout or electrical characteristics. Verify compatibility with existing PCB layout and thermal requirements before substituting.