Analog Devices Inc./Maxim Integrated MAX6463UR31+T

Overview

MAX6463UR31+T from Maxim Integrated is a 3.1V ultra-low-power voltage detector in SOT23-3 package, featuring active-low open-drain output, 1.0µA supply current at 3.6V, ±2.5% threshold accuracy over -40°C to +125°C, and 17µs propagation delay. It monitors VCC for brownout detection in battery-powered microcontroller systems requiring precise reset assertion.

For engineers reviewing the MAX6463UR31+T datasheet, MAX6463UR31+T pinout, MAX6463UR31+T application, or MAX6463UR31+T equivalent, key selection criteria include its 3.1V trip point (VTH− = 3.100V typ), internal 5% hysteresis, immunity to short transients, no external components requirement, and compatibility with logic supplies up to 6V via open-drain pullup.

Technical Context

This device implements a precision bandgap reference and comparator with internally trimmed resistor networks to set fixed 3.1V detection thresholds. Its hysteresis circuit ensures VTH+ = VTH− × 1.05 (3.255V typ), preventing output chatter during slow-rising/falling VCC transitions near threshold.

The open-drain output requires an external pullup and sinks ≥1.0mA at VCC ≥ 1.2V while maintaining VOL ≤ 0.3V; it exhibits 100nA leakage when deasserted. Startup time is 225µs, and transient immunity is characterized per the Maximum Transient Duration vs. Threshold Overdrive curve.

Key Specifications

Pinout & Package

SOT23-3 package: 1.3mm × 1.9mm × 1.0mm body, gull-wing leads, lead-free (RoHS-compliant) termination.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage detector applications.

Compared with TLV803EB31DBZR and APX803S-31SA-7, MAX6463UR31+T uniquely combines open-drain output, full -40°C to +125°C qualification, and guaranteed 5% hysteresis - making it optimal for automotive-grade and wide-temperature industrial monitoring where level-shifting and thermal robustness are essential.

Availability

MAX6463UR31+T is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, industrial IoT edge nodes, and smart meter battery backup systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6463UR31+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 and mixed-signal ICs for power, sensing, and interface applications in demanding environments.

The MAX6461–MAX6466 family was developed specifically for ultra-low-power voltage supervision in battery-critical systems, emphasizing minimal ICC, factory-trimmed thresholds, and robust transient immunity without external components.

FAQ

What is the exact threshold voltage of MAX6463UR31+T and how does it vary with temperature?

The MAX6463UR31+T has a nominal lower trip threshold (VTH−) of 3.100V at +25°C, with guaranteed range of 3.023V to 3.178V over -40°C to +125°C. This ±2.5% accuracy ensures predictable brownout behavior across automotive and industrial operating conditions. The upper threshold VTH+ is fixed at VTH− × 1.05 (3.255V typ), delivering consistent hysteresis regardless of temperature drift.

Does MAX6463UR31+T require external components to function?

No, MAX6463UR31+T operates autonomously with no external components required for basic voltage detection. Its internal bandgap reference, comparator, and trimmed resistor network eliminate calibration resistors. Only an external pullup resistor is needed on the open-drain OUT pin to establish the high-state logic level - typically 10kΩ to 100kΩ depending on rise-time and bus capacitance requirements.

Can MAX6463UR31+T interface with a 5V logic system while powered from a 3.3V supply?

Yes, MAX6463UR31+T's open-drain active-low output enables direct interfacing with higher-voltage logic. When powered from 3.3V VCC, connect the OUT pin to a 5V pullup resistor. The device sinks current when asserted (VOL ≤ 0.3V), delivering a valid logic low to the 5V system, and presents high-impedance when released, allowing the 5V pullup to define the logic high - all without level-shifting circuitry.

What is the propagation delay of MAX6463UR31+T and how is it affected by temperature?

MAX6463UR31+T exhibits 17µs typical propagation delay at +25°C, with maximum 100µs across -40°C to +125°C. The delay increases slightly at temperature extremes due to comparator slew-rate limitations, but remains tightly bounded - ensuring deterministic reset timing even in harsh thermal environments. This is confirmed in Figure 2 of the datasheet (toc02/toc03).

How does MAX6463UR31+T handle short voltage transients on the VCC line?

MAX6463UR31+T is designed to reject short-duration falling transients: for a 3.1V threshold, it ignores pulses shorter than ~15µs when VCC dips 100mV below VTH−, and shorter than ~5µs when the dip exceeds 200mV. This immunity is documented in the "Maximum VCC Transient Duration vs. VTH− Threshold Overdrive" graph (toc04), preventing false resets from switching noise or load dumps.