MAX9022AKA

Overview

The MAX9022AKA is a dual micropower voltage comparator from the Maxim Integrated MAX902x series, optimized for low-power portable applications. It operates on a single supply of 2.5V to 5.5V or dual supplies of ±1.25V to ±2.75V. Each channel consumes only 2.8µA of quiescent current over an operating temperature range of -40°C to +125°C. The device features a propagation delay of 3µs and includes 4mV of built-in hysteresis for noise immunity. It supports rail-to-rail output swing and accepts input common-mode voltages from the negative supply to within 1.1V of the positive supply. The component is housed in an ultra-small 8-pin SOT-23 package.

Feature Summary

• Ultra-low power consumption with 2.8µA per channel enables extended battery life in portable devices.
• Built-in 4mV hysteresis provides inherent noise immunity and prevents output oscillation during slow signal transitions.
• Rail-to-rail output stage allows full voltage swing capability, maximizing dynamic range in low-voltage systems.
• Wide input common-mode range extends from the negative rail to near the positive rail, simplifying interface design.

Applications

• Battery-powered portable equipment
• Sensor signal detection circuits
• Digital line receivers
• Threshold detection and monitoring

Procurement Notes

Verify the specific suffix 'AKA' against the manufacturer's official datasheet to confirm the exact tape-and-reel packaging configuration and temperature grade. Ensure compatibility with the required 8-pin SOT-23 footprint during PCB layout. Confirm that the 2.5V minimum supply voltage aligns with the system's lowest expected battery level to maintain proper comparator functionality.

Selection Notes

Select this component when minimizing static current is critical alongside moderate speed requirements. The 3µs propagation delay suits applications where nanosecond precision is unnecessary but power efficiency is paramount. Verify that the 4mV internal hysteresis meets the noise rejection needs without requiring external components. Consider the 8-pin SOT-23 package constraints for space-limited designs compared to larger SOIC options.

Part Context

The MAX9022AKA belongs to the MAX902x family of micropower comparators, which includes single (MAX9021) and quad (MAX9024) variants. This family is designed specifically for space-constrained, battery-operated electronics. The 'AKA' designation typically indicates a specific reel quantity and packaging variant within the standard SOT-23-8 form factor, distinguishing it from other pin-compatible packages like µMAX or SO.

Replacement Considerations

Cross-reference with MAX9021 for single-channel needs or MAX9024 for quad-channel integration. Verify pinout compatibility if substituting with other SOT-23-8 comparators, as electrical characteristics such as quiescent current and propagation delay may differ significantly between families.