LM393D

Overview

The LM393D is a dual voltage comparator manufactured by Texas Instruments, housed in an 8-pin SOIC surface-mount package. It features two independent differential comparators designed for single power supply operation over a wide voltage range. The device supports open-collector outputs compatible with TTL, MOS, and CMOS logic families. Key electrical parameters include a maximum supply voltage of 30V, a typical response time of 1.3 μs, and a maximum input offset voltage of 5 mV at 30V. Operating temperatures range from 0°C to +70°C.

Feature Summary

• Dual independent voltage comparators optimized for single-supply applications
• Open-collector output configuration ensuring compatibility with various logic families
• Wide common-mode input voltage range that includes ground potential

Applications

• Temperature sensing circuits
• Voltage monitoring systems
• Physical switch interface logic

Procurement Notes

Verify the manufacturer designation on the component marking, as STMicroelectronics also produces the LM393D variant. Confirm the specific suffix indicates the Texas Instruments version rather than other manufacturers. Ensure the package type matches the required SOIC-8 footprint and verify RoHS compliance status for the specific procurement batch.

Selection Notes

Select this component when a low-cost, dual-channel comparator is required for general-purpose signal switching. It is suitable for designs needing open-collector outputs to interface directly with digital logic without additional pull-up resistors if internal ones are present. Consider the 1.3 μs propagation delay for timing-sensitive applications.

Part Context

The LM393D belongs to the industry-standard LM393/LM293 family of dual comparators. This series is widely utilized in consumer electronics and industrial control due to its robust performance and low quiescent current. The device serves as a fundamental building block for analog-to-digital interfacing tasks.

Replacement Considerations

The LM393DRG3 is a verified equivalent part number from Texas Instruments featuring identical specifications and pinout compatibility.