LM239AD

Overview

The LM239AD is a quad differential comparator manufactured by Texas Instruments, designed for single-supply operation across a wide voltage range. It features an input common-mode voltage range that includes ground, allowing detection near the negative rail. The device utilizes open-collector outputs compatible with TTL, DTL, ECL, MOS, and CMOS logic systems. Key electrical specifications include a maximum supply voltage of 36 V, a typical quiescent current of 2 mA, and a maximum input offset voltage of 5 mV. It operates within a temperature range of -25°C to +85°C and is housed in a 14-pin SOIC package.

Feature Summary

• Quad differential architecture optimized for single-supply applications
• Input common-mode voltage range extends to ground potential
• Open-collector outputs ensure compatibility with various logic families
• Low power consumption suitable for battery-operated systems

Applications

• Battery-powered monitoring circuits
• Level shifting between different logic families
• Window comparator designs
• Over-voltage and under-voltage protection circuits

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix indicates the correct package type and temperature rating. Check for RoHS compliance status as older revisions may differ. Ensure storage conditions meet semiconductor handling standards to prevent damage prior to assembly.

Selection Notes

Select this component when a quad comparator with ground-referenced inputs is required. Consider the open-collector output structure for interfacing with diverse logic levels. Evaluate the 5 mV offset voltage specification against application accuracy needs. Verify thermal dissipation capabilities within the SOIC-14 package for the intended operating environment.

Part Context

The LM239AD belongs to the LMx39 series of quad comparators from Texas Instruments. This family shares functional similarities with the LM139, LM339, and LM2901, differing primarily in manufacturing grade and specific parameter tolerances. The AD suffix typically denotes an industrial temperature range and specific packaging configuration compared to other variants in the lineup.

Replacement Considerations

LM339AD: Pin-compatible alternative with similar electrical characteristics but potentially different offset voltage specifications. LM2901N: Industrial grade variant offering comparable performance in a DIP package. Verify pinout compatibility and electrical limits before substitution.