Analog Devices Inc./Maxim Integrated MAX6461XR18+T

Overview

MAX6461XR18+T from Maxim Integrated is an ultra-low-power voltage detector IC designed for precision supply monitoring in battery-powered systems. It features a factory-set 1.80V lower trip threshold (VTH−), ±2.5% threshold accuracy over −40°C to +125°C, 1.0µA supply current at 3.6V, and 17µs propagation delay. It operates in SC70-3 package and is used in portable medical devices and cellular phone power supervision.

For engineers reviewing the MAX6461XR18+T datasheet, MAX6461XR18+T pinout, MAX6461XR18+T application, or MAX6461XR18+T equivalent, key selection criteria include threshold accuracy, ultra-low quiescent current, hysteresis behavior (VTH+ = VTH− × 1.05), temperature range compliance, and SC70-3 footprint compatibility with space-constrained designs.

Technical Context

The MAX6461XR18+T implements a precision bandgap reference and comparator-based detection architecture with internally trimmed resistor networks. Its fixed 1.80V VTH− threshold (±2.5% over temperature) and 5% internal hysteresis define robust reset assertion/deassertion boundaries without external components.

This device belongs to the MAX6461–MAX6466 family's voltage detector subset (not µP supervisory), delivering fast 17µs response to VCC droop while maintaining immunity to short transients. It uses push-pull active-low output stage and requires no external timing or biasing elements.

Key Specifications

Pinout & Package

MAX6461XR18+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for ultra-compact PCB layouts. Pin 1 is OUT (active-low push-pull), Pin 2 is GND, and Pin 3 is VCC - all pins are surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB18DBZR and TPS3801K18DBVR, the MAX6461XR18+T delivers superior temperature-stable threshold accuracy (±2.5% to +125°C) and lowest ICC in its class, making it optimal for long-life, wide-temperature embedded systems where minimal BOM and guaranteed hysteresis are critical.

Availability

MAX6461XR18+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phones, and industrial IoT edge controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MAX6461XR18+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power, high-accuracy voltage supervision in space- and energy-constrained portable electronics - prioritizing nanoscale current consumption, factory-trimmed thresholds, and minimal external component count.

FAQ

What is the exact threshold voltage and tolerance of MAX6461XR18+T over temperature?

The MAX6461XR18+T has a nominal lower trip threshold (VTH−) of 1.800V at +25°C, with guaranteed limits of 1.755V (min) to 1.845V (max) across the full −40°C to +125°C operating range. This ±2.5% accuracy is specified in the datasheet's Electrical Characteristics table and applies to all units without user calibration.

Does MAX6461XR18+T include a reset timeout period like some supervisory ICs?

No, MAX6461XR18+T is a voltage detector (not a µP supervisory circuit), so it does not incorporate a minimum reset timeout period. Its output asserts immediately when VCC falls below VTH− and deasserts as soon as VCC rises above VTH+ (1.89V). For timed reset hold, consider MAX6464XR18+T or similar members of the same family.

What output configuration does MAX6461XR18+T use, and how is it connected?

MAX6461XR18+T uses a push-pull, active-low output stage. Pin 1 (OUT) drives low (≤0.3V at 1mA sink) when VCC < 1.80V and drives high (≥0.8×VCC) when VCC > 1.89V. No external pull-up resistor is needed, enabling direct interface with standard CMOS logic inputs.

Can MAX6461XR18+T operate from a 1.2V supply?

Yes, MAX6461XR18+T is fully specified to operate with VCC as low as 1.2V, per Absolute Maximum Ratings and Electrical Characteristics. However, its 1.80V threshold means it will assert output only when VCC drops below that level - so it remains functional but inactive until VCC falls into the detection range.

Is MAX6461XR18+T lead-free and RoHS compliant?

Yes, the "+T" suffix in MAX6461XR18+T explicitly denotes lead-free, RoHS-compliant packaging. Maxim Integrated confirms this variant meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for standard Pb-free reflow soldering processes.