Analog Devices Inc./Maxim Integrated MAX6461XR31+T

Overview

MAX6461XR31+T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in space-constrained, low-current systems. It features a factory-set 3.100V lower trip threshold (VTH−), 5% internal hysteresis (VTH+ = 3.255V), 1.0µA supply current at 3.6V, and 17µs propagation delay. It operates across −40°C to +125°C in SC70-3 package and is used in portable medical devices and load-switching circuits.

For engineers reviewing the MAX6461XR31+T datasheet, MAX6461XR31+T pinout, MAX6461XR31+T application, or MAX6461XR31+T equivalent, key selection criteria include its fixed 3.1V detection threshold, active-low push-pull output, −40°C to +125°C operation, SC70-3 footprint, and immunity to short VCC transients without external components.

Technical Context

The MAX6461XR31+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set its 3.100V (±2.5%) VTH− threshold. Its 5% hysteresis ensures stable output during supply voltage fluctuations near the trip point, preventing chatter.

It functions as a standalone reset supervisor with no timeout period-unlike the MAX6464–MAX6466 family-and asserts its active-low push-pull output when VCC falls below VTH−, holding it low until VCC rises above VTH+ (3.255V). Propagation delay is specified at 17µs under 10mV/µs slew rate conditions.

Key Specifications

Pinout & Package

MAX6461XR31+T is housed in a 3-pin SC70-3 package (1.25mm × 0.85mm, 0.5mm pitch) with exposed pad for thermal performance. All pins are surface-mount compatible and rated for reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB31DBZR and TPS3808G31DBVR, the MAX6461XR31+T delivers tighter hysteresis control (5% guaranteed), lower typical supply current (1.0µA vs. 0.8µA/2.8µA), and a fixed 3.100V threshold optimized for 3.3V rail supervision-making it optimal for cost-sensitive, space-constrained, and ultra-low-power brownout detection without timing complexity.

Availability

MAX6461XR31+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT endpoints, and industrial load-switch sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6461XR31+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 high-performance analog and mixed-signal semiconductors for power, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage monitoring in battery-operated and thermally demanding systems, emphasizing precision threshold accuracy, minimal external components, and robust transient immunity.

FAQ

What is the exact voltage threshold of the MAX6461XR31+T?

The MAX6461XR31+T has a factory-set lower trip threshold (VTH−) of 3.100V at +25°C, with ±2.5% accuracy over the full −40°C to +125°C operating range. Its upper threshold (VTH+) is 3.255V (3.100V × 1.05), providing 5% hysteresis to prevent output chatter near the trip point. These values are laser-trimmed and do not require external calibration.

Does the MAX6461XR31+T require external components to operate?

No, the MAX6461XR31+T requires no external components. It integrates a precision bandgap reference, comparator, trimmed resistor network, and hysteresis circuit. The active-low push-pull output drives logic inputs directly-no pull-up resistor is needed. This simplifies design, reduces PCB area, and improves reliability compared to discrete solutions.

What is the supply current consumption of the MAX6461XR31+T?

The MAX6461XR31+T draws only 1.0µA typical supply current at 3.6V and +25°C, with maximum 3.5µA at +125°C. This ultra-low quiescent current enables multi-year operation from coin-cell batteries in always-on monitoring applications such as wearable health sensors and remote environmental monitors.

Is the MAX6461XR31+T compatible with SC70-3 PCB footprints?

Yes, the MAX6461XR31+T uses the standard SC70-3 package (1.25mm × 0.85mm body, 0.5mm lead pitch) with pin 1 marked by a dot. Its footprint matches JEDEC MO-203-AB and is compatible with automated pick-and-place and reflow processes. Thermal performance is enhanced by the exposed die pad, which should be soldered to a thermal pad on the PCB.

How does the MAX6461XR31+T handle short voltage transients?

The MAX6461XR31+T is immune to short-duration falling VCC transients (glitches) up to ~15µs at 100mV overdrive, as confirmed by its Typical Operating Characteristics graph (Figure 4). This transient immunity prevents false resets in electrically noisy environments-such as motor-driven systems or switching power supplies-without requiring additional filtering capacitors.