LM239NG4

Overview

The LM239NG4 is a quad differential voltage comparator manufactured by Texas Instruments, belonging to the LMx39 series. It features four independent comparators designed for single or split power supply operation with a wide voltage range of +2V to +36V or ±1V to ±18V. The device utilizes an open-collector output configuration compatible with TTL, DTL, ECL, MOS, and CMOS logic systems. Key electrical characteristics include a maximum input offset voltage of 5mV, a typical supply current of 2mA, and a response time of 300ns. It operates within a temperature range of -25°C to +85°C and is housed in a 14-pin CDIP package.

Feature Summary

• Four independent precision-voltage comparators integrated into a single package
• Input common-mode voltage range includes ground even when operating from a single power supply
• Open-collector outputs allow direct interfacing with various logic families including TTL and CMOS
• Low power consumption with supply current largely independent of the supply voltage magnitude

Applications

• Battery-powered systems requiring low quiescent current
• Voltage monitoring and detection circuits near ground potential
• Logic interface adapters between different voltage domains
• Window comparator configurations for threshold detection

Procurement Notes

Verify that the ordering suffix 'G4' confirms lead-free status and RoHS compliance as per Texas Instruments documentation. Ensure the package type matches the required CDIP-14 through-hole form factor. Confirm the industrial temperature grade (-25°C to +85°C) aligns with system environmental requirements. Cross-reference the specific datasheet revision to ensure parameter consistency with design specifications.

Selection Notes

Select this component when a quad comparator with ground-referenced input capability is required for single-supply applications. The open-collector output structure facilitates wired-AND connections and level shifting. Consider the 5mV maximum offset voltage for precision applications. Verify that the 300ns propagation delay meets the timing constraints of the target circuit compared to faster comparator alternatives.

Part Context

The LM239NG4 is part of the broader LM139/LM239/LM339 family of quad comparators produced by Texas Instruments. This family is widely recognized for its versatility in single-supply operations and compatibility with standard digital logic families. The 'N' designation indicates the PDIP/CDIP package style, while 'G4' specifies the green, lead-free, and RoHS-compliant manufacturing variant.

Replacement Considerations

Compatible substitutes include LM239ADR (SOIC package), LM239DR (SOIC package), and LM239DRG4 (SOIC package). For pin-compatible through-hole replacements, consider LM239N or LM239NG. Verify that alternative manufacturers such as STMicroelectronics offer equivalent quad comparator devices with matching electrical parameters.