MAX9021AUK-T

Overview

The MAX9021AUK-T is a single-channel micropower voltage comparator manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single supply voltage ranging from 2.5V to 5.5V or dual supplies of ±1.25V to ±2.75V. The device consumes 2.8µA of supply current per comparator and features a typical propagation delay of 3µs. It includes built-in 4mV hysteresis for noise immunity and supports rail-to-rail output swing. The input common-mode range extends from the negative supply to within 1.1V of the positive supply. The component is housed in a 5-pin SOT-23 package and is rated for an operating temperature range of -40°C to +125°C.

Feature Summary

• Ultra-low power consumption optimized for portable applications
• Built-in internal hysteresis prevents oscillations with slow-moving signals
• Rail-to-rail output capability ensures full signal utilization
• No phase reversal occurs when inputs are overdriven

Applications

• Battery-powered portable systems
• Sensor-signal detection circuits
• Digital line receivers
• Threshold detectors and discriminators

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape-and-reel packaging configuration. Confirm the 'A' designation aligns with the extended industrial temperature range specifications (-40°C to +125°C). Ensure the 'UK' package code corresponds to the required 5-pin SOT-23 footprint for board layout compatibility. Cross-reference the manufacturer part number against official Analog Devices documentation to validate authenticity and revision status before integration.

Selection Notes

Select this component for designs requiring minimal quiescent current in space-constrained environments. The SOT-23 package offers a compact footprint suitable for mobile communications and handheld devices. Consider the 3µs propagation delay for timing-sensitive threshold detection tasks. The wide common-mode input range simplifies biasing requirements compared to comparators with limited input swings.

Part Context

This device belongs to the MAX9021/MAX9022/MAX9024 family of micropower comparators. While the MAX9022 provides dual channels and the MAX9024 offers quad channels, the MAX9021 specifically integrates a single comparator channel. All variants share identical electrical characteristics regarding speed, power, and input/output performance, differing only in channel count and physical pin configurations.

Replacement Considerations

Direct functional substitutes within the same series include the MAX9021AXK+T (SC70-5 package) and MAX9021AUA+T (if available in compatible form factor). Verify pinout compatibility between SOT-23 and alternative packages like SC70 before substitution.