LM339SNG

Overview

The LM339SNG is a quad voltage comparator integrated circuit manufactured by onsemi. It features four independent precision comparators designed for single-supply operation over a wide voltage range, typically from +2V to +36V, or dual supplies. The device includes an open-collector output structure compatible with various logic families such as TTL, DTL, ECL, MOS, and CMOS. Key electrical characteristics include a low input bias current of 25 nA typical, a low input offset voltage of ±1 mV typical, and a supply current of 1.1 mA that remains independent of the supply voltage. The input common-mode voltage range extends to ground, allowing for direct sensing near the negative rail.

Feature Summary

• Four independent high-precision voltage comparators integrated into a single package
• Open-collector outputs enabling flexible interfacing with diverse logic families
• Input common-mode voltage range includes ground potential for single-supply applications
• Low supply current consumption that remains stable regardless of supply voltage variations

Applications

• Battery monitoring systems requiring precise voltage threshold detection
• Over-voltage and under-voltage protection circuits in power supplies
• Temperature sensing interfaces using thermistor-based voltage dividers
• Window comparator configurations for level detection

Procurement Notes

Verify the manufacturer marking indicates onsemi rather than National Semiconductor or other legacy producers. Confirm the suffix 'NG' corresponds to the specific tape-and-reel packaging configuration intended for surface-mount assembly. Ensure the component date code aligns with current production status to avoid obsolete stock. Cross-reference the ordering part number with official distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select this component when designing circuits requiring multiple independent comparison functions within a constrained footprint. The open-collector output necessitates external pull-up resistors; choose resistor values balancing switching speed against power dissipation. Consider the input offset voltage specifications if high accuracy is required at low differential voltages. Verify that the operating temperature range meets the environmental requirements of the target application.

Part Context

This device belongs to the industry-standard LM339 family of quad comparators. It serves as a direct functional replacement for equivalent parts from other manufacturers, maintaining pin compatibility and electrical performance. The SNG suffix denotes a specific surface-mount package variant, distinguishing it from through-hole DIP versions. It is widely utilized in industrial control, consumer electronics, and automotive applications where reliable voltage comparison is essential.

Replacement Considerations

Compatible substitutes include the LM339DR from Texas Instruments and the LM339DT from STMicroelectronics. These alternatives offer identical pinouts and electrical characteristics, facilitating drop-in replacements in existing designs. Verify package dimensions and thermal properties to ensure mechanical compatibility during substitution.