MAX6427EHUR-T

Overview

The MAX6427EHUR-T is a low-power, single-level battery monitor with internal hysteresis, manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates within a supply voltage range of 1.6 V to 5.5 V and is housed in an SOT-23-3 surface-mount package. The device provides a low-battery output indicator that asserts when the supply voltage drops below a specified threshold and deasserts after rising above a higher threshold following a minimum 140 ms timeout period. This timing ensures supply stabilization before enabling power-converter or microprocessor activity. The component supports monitoring single lithium-ion cells or multicell alkaline/NiCd/NiMH power supplies.

Feature Summary

• Provides single low-battery output indication for three distinct battery conditions: good, weak, and empty.
• Features internal hysteresis to prevent output oscillation during voltage transitions.
• Includes a minimum 140 ms timeout period to ensure supply voltage stabilization before system activation.

Applications

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

Procurement Notes

Verify the exact suffix configuration against official datasheets, as ordering codes may vary. Confirm RoHS compliance status and lead times directly with authorized distributors. Check for end-of-life notifications or discontinuation notices from Analog Devices. Ensure the specific temperature grade matches application requirements. Validate package marking and pinout compatibility with existing PCB layouts.

Selection Notes

Select this component for applications requiring simple, low-cost battery level indication without complex communication interfaces. Consider the fixed threshold voltage options available within the MAX6427 family to match specific battery chemistries. Evaluate the low quiescent current consumption for extended battery life in portable devices. Ensure the SOT-23-3 package footprint fits within the mechanical constraints of the design.

Part Context

The MAX6427 belongs to the MAX6427–MAX6438 family of low-power battery monitors. This family includes both single-level and dual-level variants, offering flexibility for different battery management strategies. The series is designed for portable electronics where power conservation and reliable battery status reporting are critical. Analog Devices acquired Maxim Integrated, consolidating these product lines under one manufacturer.

Replacement Considerations

Direct substitutes within the same family include MAX6428 and MAX6429, which share identical functionality but differ in threshold voltage settings. Verify that any replacement part maintains the same SOT-23-3 package and electrical characteristics. Cross-reference datasheets to ensure compatible hysteresis and timeout specifications.