MAX9042AEUA+T

Overview

The MAX9042AEUA+T is a micropower, single-supply comparator integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features two comparators and one precision voltage reference within an 8-pin µMAX package. The device operates from a supply voltage range of 2.5V to 5.5V with a typical quiescent current of 55µA at 2.7V. It provides rail-to-rail inputs and outputs, capable of sinking and sourcing up to 8mA. The internal voltage reference is fixed at 2.048V with A-grade initial accuracy of ±0.4% and a temperature coefficient of 6ppm/°C. Propagation delay is typically 400ns.

Feature Summary

• Integrates dual comparators with a precision voltage reference in a compact surface-mount package
• Features rail-to-rail input and output stages for wide common-mode voltage operation
• Includes internal hysteresis to ensure clean switching with slow-moving signals
• Utilizes a unique output stage design that minimizes supply current surges during transitions

Applications

• Precision battery management systems
• Window comparator circuits
• Infrared (IR) receivers
• Level translators
• Digital line receivers

Procurement Notes

Verify the specific ordering suffix 'EUA' corresponds to the 8-pin µMAX package configuration required for your board layout. Confirm the 'A' grade designation ensures the tighter initial accuracy specifications if precision is critical. Check the datasheet for absolute maximum ratings regarding soldering thermal profiles, as this device requires preheating and prohibits hand or wave soldering methods.

Selection Notes

Select this component when a dual-channel comparator with an integrated reference is needed in a small footprint. The 2.048V reference makes it suitable for interfacing with ADCs requiring that specific threshold. Ensure the application benefits from the low 55µA supply current for battery longevity. Verify that the 400ns propagation delay meets the timing requirements of the signal processing chain.

Part Context

This part belongs to the MAX9038–MAX9043 family of micropower comparators. These devices combine low-power comparators with precision voltage references optimized for 3V and 5V systems. The MAX9042 specifically houses two comparators sharing a single reference, distinguishing it from single-comparator variants like the MAX9040 while maintaining similar power efficiency characteristics.

Replacement Considerations

Public confirmed substitute part numbers: MAX9042BEUA+T