Analog Devices Inc./Maxim Integrated MAX6466UR29+T

Overview

MAX6466UR29+T from Maxim Integrated is a lead-free, ultra-low-power microprocessor supervisory circuit in SOT23-3 package, featuring 2.9V lower trip threshold (VTH−), 150ms minimum reset timeout period, ±2.5% threshold accuracy over −40°C to +125°C, and open-drain active-low output. It monitors system supply voltage for reliable power-on reset in battery-powered portable medical devices.

For engineers reviewing the MAX6466UR29+T datasheet, MAX6466UR29+T pinout, MAX6466UR29+T application, or MAX6466UR29+T equivalent, this page delivers verified functional identity, confirmed SOT23-3 pin mapping, exact VTH− = 2.900V (typ) / 2.828V–2.973V (min/max over temp), hysteresis = 5%, and reset timeout = 150–430ms - all validated against Maxim's official datasheet Rev 2 (12/05).

Technical Context

The MAX6466UR29+T implements a precision bandgap reference with internally trimmed resistor networks to set a factory-trimmed 2.9V detection threshold, combined with 5% internal hysteresis (VTH+ = VTH− × 1.05). Its open-drain output requires an external pullup and asserts low when VCC falls below VTH−, holding low for ≥150ms after VCC rises above VTH+.

This device belongs to the MAX6464–MAX6466 µP supervisory subgroup and is functionally distinct from the MAX6461–MAX6463 voltage detectors due to its guaranteed minimum 150ms reset timeout period and absence of propagation delay specification - confirming it is not a simple voltage detector but a time-delayed reset generator.

Key Specifications

Pinout & Package

SOT23-3 package: 1.3mm × 2.9mm × 1.0mm body, gull-wing leads, RoHS-compliant lead-free finish (+T suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6466XR29+T, the MAX6466UR29+T provides superior thermal dissipation in high-ambient environments; compared with TPS3808G125DBVR, it delivers lower quiescent current and reduced component count for basic voltage supervision-only use cases.

Availability

MAX6466UR29+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT endpoints, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6466UR29+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power, space-constrained systems requiring reliable voltage monitoring and reset generation without external components - targeting portable medical, wearables, and remote sensing applications.

FAQ

What is the exact voltage threshold and tolerance of MAX6466UR29+T?

The MAX6466UR29+T has a factory-set lower trip threshold (VTH−) of 2.900V (typical) with guaranteed limits of 2.828V (min) to 2.973V (max) across −40°C to +125°C, corresponding to ±2.5% accuracy. The upper threshold (VTH+) is 3.031V (typ), derived as VTH− × 1.05, with 5% hysteresis inherent to the design.

Does MAX6466UR29+T require external components to operate?

No, the MAX6466UR29+T requires no external components for core supervision functionality. Its precision bandgap reference, comparator, trimmed resistor network, and hysteresis circuit are fully integrated. Only an external pullup resistor is needed on the open-drain OUT pin to establish the logic-high state - a minimal, non-critical passive component.

What is the reset timeout behavior of MAX6466UR29+T during power-up?

Upon power-up, when VCC rises above the upper threshold VTH+ (≈3.031V), the MAX6466UR29+T asserts its open-drain output low for a minimum of 150ms, then releases it high. This guaranteed timeout ensures the connected microcontroller completes internal initialization before software execution begins - critical for reliable boot sequences.

Can MAX6466UR29+T interface with a 1.8V logic system while monitoring a 3.3V supply?

Yes. The MAX6466UR29+T's open-drain active-low OUT pin can be pulled up to 1.8V (or any voltage from 0V to 6V) independently of its VCC pin (which monitors the 3.3V supply). This allows direct interfacing with lower-voltage logic families without level-shifters, preserving signal integrity and reducing component count.

Is MAX6466UR29+T suitable for automotive under-hood applications?

Yes. The MAX6466UR29+T is specified from −40°C to +125°C and qualified for industrial-grade operation. While not AEC-Q100 certified, its extended temperature range, 5% hysteresis, and transient immunity make it suitable for non-safety-critical under-hood functions such as cabin sensors, infotainment power sequencing, or telematics module supervision where full automotive qualification is not mandated.