Analog Devices Inc./Maxim Integrated MAX6430EHUS+T

Overview

MAX6430EHUS+T from Maxim Integrated is a dual-output, factory-trimmed battery monitor IC for single Li+ or two/three-cell alkaline/NiMH/NiCd systems. It provides two active-low open-drain outputs (LBOH and LBOL) with 140ms minimum timeout, ±2.5% threshold accuracy, and 1µA typical supply current. It operates from 1.6V to 5.5V and supports battery-good/weak/empty state indication in portable medical devices and pagers.

For engineers reviewing the MAX6430EHUS+T datasheet, MAX6430EHUS+T pinout, MAX6430EHUS+T application, or MAX6430EHUS+T equivalent, this page delivers verified specifications, SOT143-4 package details, dual-threshold timing behavior, and real-world substitution guidance - all confirmed against Maxim's official documentation and ordering data.

Technical Context

The MAX6430EHUS+T implements two independent comparators with internal hysteresis and fixed factory-trimmed thresholds: VHTH− (e.g., 2.8V) and VLTH− (e.g., 2.3V) for LBOH/LBOL assertion, plus corresponding VHTH+ (≈1.05×VHTH−) and VLTH+ (≈1.05×VLTH−) for deassertion. Its 140ms timeout ensures stable voltage recovery before output release.

It uses BATT as both power source and monitored input, requires no external components, and guarantees valid logic states down to BATT = 1.0V. The device features open-drain outputs compatible with pull-up voltages up to 5.5V - enabling interface with higher-voltage microcontrollers while operating directly from battery rail.

Key Specifications

Pinout & Package

SOT143-4 package: 1.3mm × 1.3mm × 0.95mm body, 0.65mm pitch, lead-free (RoHS-compliant), tape-and-reel delivery only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-level battery monitor applications.

Compared with MAX6430EHUS+T, MAX6431EHUS+T offers higher factory-set thresholds for earlier warning, while TLV809E33DBZR provides basic reset functionality without dual-state awareness or built-in hysteresis timing - making it inadequate for battery-state grading applications.

Availability

MAX6430EHUS+T is available at Aetrix Electronics and suitable for portable medical devices, pagers, cell phones, and electronic toys requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6430EHUS+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and consumer applications.

The MAX6427–MAX6438 family was engineered specifically for ultra-low-power battery-state monitoring in space- and energy-constrained portable electronics - delivering dual-threshold intelligence without external components.

FAQ

What is the exact threshold voltage configuration for MAX6430EHUS+T?

The MAX6430EHUS+T is factory-trimmed to VHTH− = 2.8V and VLTH− = 2.3V (per Maxim's Standard Versions Table). Its corresponding deassertion thresholds are VHTH+ ≈ 2.94V and VLTH+ ≈ 2.415V (1.05× nominal). These values are laser-trimmed during production and require no external adjustment - ensuring consistent performance across units and temperature.

Does MAX6430EHUS+T require external resistors or capacitors to operate?

No. The MAX6430EHUS+T requires zero external components: BATT connects directly to Pin 1, GND to Pin 2, and pull-up resistors (if used) connect externally to LBOH (Pin 3) and LBOL (Pin 4). Its factory-trimmed thresholds, internal 140ms timer, and open-drain drivers eliminate the need for dividers, capacitors, or calibration circuitry - simplifying layout and reducing BOM cost.

Can MAX6430EHUS+T operate with a single 1.5V alkaline cell?

No. The MAX6430EHUS+T requires a minimum supply voltage of 1.6V for guaranteed operation per its Absolute Maximum Ratings and Electrical Characteristics tables. A fresh 1.5V alkaline cell starts at ~1.6V but drops rapidly under load; for reliable function, use two alkaline cells (nominal 3.0V) or a single Li+ cell (2.7–4.2V). The device guarantees valid output logic down to BATT = 1.0V, but not functional monitoring below 1.6V.

How does the 140ms timeout period improve system reliability?

The 140ms timeout in MAX6430EHUS+T prevents false deassertion during transient voltage recovery - such as when a load is removed and battery voltage rebounds momentarily. Without this delay, rapid on/off cycling (chattering) could cause microprocessor resets, display flicker, or motor stuttering. The fixed timeout ensures the supply has stabilized before enabling downstream circuitry, improving robustness in dynamic power environments.

Is MAX6430EHUS+T pin-compatible with other devices in the MAX6427–MAX6438 family?

No. MAX6430EHUS+T uses the 4-pin SOT143-4 package, while MAX6433–MAX6435 use 5-pin SOT23-5 and MAX6436–MAX6438 use 6-pin SOT23-6. Even within the SOT143 group, MAX6430/MAX6431/MAX6432 share pinout, but MAX6427–MAX6429 (SOT23-3) and MAX6433+ variants have incompatible pin counts and functions - requiring PCB redesign for substitution.