MAX981ESA+

Comparators Overview

The MAX981ESA+ is a single-channel, ultra-low-power analog comparator manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single supply of 2.5V to 11V or dual supplies of ±1.25V to ±5.5V. The device features an internal 1.182V voltage reference with ±2% accuracy and includes programmable hysteresis via the HYST pin. It draws less than 4µA of supply current over temperature. The input voltage range extends from the negative supply rail to within 1.3V of the positive supply. Propagation delay is typically 12µs with a 10mV overdrive. The output is open-drain, allowing wire-OR configurations.

Comparators Feature Summary

• Ultra-low quiescent current consumption of less than 4µA over extended temperature ranges
• Integrated 1.182V bandgap voltage reference with ±2% accuracy
• Programmable hysteresis using the HYST pin without external feedback equations
• Open-drain outputs supporting wire-ORed configurations and level translation

Comparators Applications

• Battery-powered systems requiring minimal power drain
• Threshold detectors for voltage monitoring
• Window comparators for undervoltage/overvoltage detection
• Level translators between bipolar and single-ended signals
• Oscillator circuits utilizing precise timing thresholds

Comparators Procurement Notes

Verify the specific suffix 'ESA+' corresponds to the 8-pin SOIC package and the -40°C to +85°C extended temperature range. Confirm RoHS compliance status as manufacturing practices may evolve. Ensure the ordering code matches the exact pinout and electrical specifications required for your design, as variations exist within the MAX981 family.

Comparators Selection Notes

Select this component when low power consumption is critical alongside the need for an internal reference. The MAX981 series offers ±2% reference accuracy, distinct from the ±1% accuracy found in the MAX971 series. Consider the open-drain output capability if interfacing with different logic voltage levels. Verify that the 12µs propagation delay meets the speed requirements of your application compared to faster comparator alternatives.

Comparators Part Context

The MAX981ESA+ belongs to the MAX971–MAX974 and MAX981–MAX984 family of micropower comparators. This family is characterized by its extremely low supply current and integrated precision references. The MAX981 variant specifically provides a single comparator with a 2% accurate reference, distinguishing it from the higher precision MAX971 and the quad-channel MAX984.

Comparators Replacement Considerations

The MAX971ESA+ serves as a direct functional substitute within the same package, offering improved reference accuracy of ±1% instead of ±2%. Designers should verify that the tighter tolerance aligns with their circuit requirements. Other family members like the MAX982 or MAX983 offer dual channels but share similar electrical characteristics.