MAX6428EHUR+

Overview

The MAX6428EHUR+ is a low-power, precision voltage supervisor IC from Maxim Integrated, now part of Analog Devices. It features a fixed 2.93V reset threshold and operates within a supply voltage range of 1V to 5.5V. Designed for single-cell lithium-ion or multi-cell alkaline/NiCd/NiMH power supplies, it provides battery monitoring with internal hysteresis. The device asserts a low-battery output when voltage drops below the specified threshold and deasserts after rising above the high threshold following a minimum 140ms timeout period. It is housed in a SOT-23-3 package and supports surface-mount installation.

Feature Summary

• Provides single-level battery monitoring with internal hysteresis for stable operation
• Features a fixed 2.93V reset threshold for precise voltage supervision
• Includes a minimum 140ms timeout period to ensure supply voltage stabilization before enabling system activity

Applications

• Monitoring single lithium-ion (Li+) cells
• Monitoring multicell alkaline power supplies
• Monitoring NiCd/NiMH power supplies

Procurement Notes

Verify the exact suffix against official Analog Devices documentation to confirm pinout and electrical characteristics. Ensure the component matches the required SOT-23-3 package and operating temperature range of -40°C to 85°C. Confirm lead finish specifications if RoHS compliance or specific solderability requirements are critical for your assembly process.

Selection Notes

Select this component when a fixed 2.93V threshold is appropriate for the target battery chemistry. Consider the SOT-23-3 package size constraints and the need for internal hysteresis to prevent output chatter during voltage transitions. Verify that the 1V to 5.5V input range covers the expected discharge curve of the monitored battery pack.

Part Context

The MAX6428EHUR+ belongs to the MAX6427–MAX6438 family of low-power, single/dual-level battery monitors. This series is designed to indicate three battery conditions: good, weak, or empty. The MAX6428 specifically offers a single low-battery output indicator, making it suitable for applications requiring basic battery status monitoring without complex dual-threshold configurations.

Replacement Considerations

Check the MAX6427DGUR+ datasheet for similar low-power battery monitoring capabilities. Verify if the threshold voltages and package types are compatible with your existing design constraints before substitution.