LM239ADT

Overview

The LM239ADT is a low-power quad voltage comparator manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It features four independent precision-voltage comparators with a maximum input offset voltage of 2 mV at 30 V. The device operates from a single supply voltage ranging from 2 V to 32 V or dual supplies from ±1 V to ±16 V. Key electrical parameters include a typical response time of 1.3 µs, a maximum operating supply current of 2 mA, and an output short-circuit current capability of 16 mA at 5 V. The input common-mode voltage range includes ground, allowing operation with signals referenced to the negative rail.

Feature Summary

• Offers four independent precision-voltage comparators within a single integrated circuit
• Supports wide single-supply or dual-supply voltage operation for flexible power configurations
• Features open-collector outputs compatible with various logic families including TTL, CMOS, and ECL
• Input common-mode voltage range extends to ground potential even when powered by a single supply

Applications

• Battery-powered systems requiring low quiescent current consumption
• Voltage monitoring circuits for power supply supervision
• Logic level shifting between different voltage domains
• Temperature sensing interfaces using thermistors or RTDs

Procurement Notes

Verify the specific ordering suffix to confirm the tape and reel packaging configuration, as standard quantities may vary. Ensure the component meets RoHS compliance requirements for your target market. Confirm the lead time availability directly with authorized distributors, as production cycles can impact delivery schedules. Cross-reference the datasheet revision date to ensure compatibility with your design specifications.

Selection Notes

Select this component when a quad comparator solution is required with low power consumption and wide supply voltage flexibility. The SOIC-14 package is suitable for space-constrained printed circuit board designs. Consider the open-collector output structure if interfacing with multiple logic families or requiring wired-AND configurations. Evaluate the 2 mV maximum offset voltage specification against the precision requirements of your differential signal processing tasks.

Part Context

This part belongs to the LM139/LM239/LM339 family of low-power quad comparators. The 'A' suffix typically denotes improved offset voltage specifications compared to standard variants. The 'DT' suffix indicates the 14-SOIC surface-mount package type. This family is widely used in industrial and consumer electronics for analog-to-digital interface applications.

Replacement Considerations

LM139ADR from Texas Instruments is a documented similar substitute within the same functional family.