Analog Devices Inc./Maxim Integrated MAX6461UR34+T

Overview

MAX6461UR34+T from Maxim Integrated is a precision ultra-low-power voltage detector IC designed for battery and power-supply monitoring in space-constrained portable systems. It features a factory-set 3.4V lower trip threshold (VTH−), 5% internal hysteresis, ±2.5% threshold accuracy over −40°C to +125°C, and 1.0µA supply current at 3.6V - enabling reliable reset supervision in Li+-based medical devices and wearables.

For engineers reviewing the MAX6461UR34+T datasheet, MAX6461UR34+T pinout, MAX6461UR34+T application, or MAX6461UR34+T equivalent, key selection considerations include its SOT23-3 package, active-low push-pull output, 17µs propagation delay, and immunity to sub-20µs VCC transients - critical for low-voltage brownout detection in battery-powered microcontroller systems.

Technical Context

The MAX6461UR34+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set its fixed 3.4V detection threshold. Its hysteresis circuit ensures VTH+ = VTH− × 1.05 (i.e., 3.57V), preventing output chatter during slow-rising or noisy supply conditions.

This device belongs to the MAX6461–MAX6463 voltage detector subgroup (not µP supervisory with timeout), delivering deterministic 17µs propagation delay on both rising and falling edges, and operates fully across −40°C to +125°C without external components or calibration.

Key Specifications

Pinout & Package

MAX6461UR34+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with pin 1 = OUT, pin 2 = GND, pin 3 = VCC. The package measures 2.92mm × 1.3mm × 1.0mm and supports reflow soldering 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 TLV803EB34DBZR and APX803S-34SA-7, MAX6461UR34+T uniquely combines ±2.5% threshold accuracy over −40°C to +125°C, true push-pull drive, and 1.0µA ICC in a single SOT23-3 package - making it optimal for high-reliability, long-life battery systems demanding guaranteed performance across extreme temperatures.

Availability

MAX6461UR34+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6461UR34+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 industrial, medical, and communications applications.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems - prioritizing nanoscale current consumption, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact voltage threshold of MAX6461UR34+T?

The MAX6461UR34+T has a nominal lower trip threshold (VTH−) of 3.400V at +25°C, with guaranteed limits of 3.315V (min) and 3.485V (max) across −40°C to +125°C. Its upper threshold (VTH+) is 3.570V (typ), calculated as VTH− × 1.05, providing built-in 5% hysteresis to prevent output oscillation during marginal supply conditions.

Does MAX6461UR34+T include a reset timeout period?

No, MAX6461UR34+T does not include a reset timeout period. It belongs to the MAX6461/MAX6462/MAX6463 voltage detector subgroup, which asserts output immediately upon VCC crossing VTH− and releases it immediately upon VCC exceeding VTH+. Timeout functionality (e.g., 150ms minimum) is exclusive to the MAX6464–MAX6466 supervisory variants.

What output configuration does MAX6461UR34+T use?

MAX6461UR34+T features an active-low push-pull output stage. When VCC falls below 3.4V, the OUT pin is driven low (≤0.3V at 1mA sink); when VCC rises above 3.57V, OUT is actively driven high (≥0.8×VCC). This eliminates the need for an external pull-up resistor and ensures fast, strong logic-level signaling to microcontroller reset inputs.

Can MAX6461UR34+T operate from a 1.8V supply?

Yes, MAX6461UR34+T operates from 1.2V to 6.0V VCC, so it functions reliably at 1.8V. However, its 3.4V detection threshold means it will assert reset whenever VCC drops below 3.4V - thus it cannot monitor a 1.8V rail directly. It is intended to monitor higher rails (e.g., 3.3V or 3.6V) while being powered from the same rail.

Is MAX6461UR34+T pin-compatible with other MAX646x variants in SOT23-3?

Yes, all MAX6461–MAX6466 devices in the SOT23-3 package (e.g., MAX6461URxx+T, MAX6462URxx+T) share identical pinout: pin 1 = OUT, pin 2 = GND, pin 3 = VCC. However, functional differences exist - MAX6461UR34+T is a voltage detector (no timeout), whereas MAX6464UR34+T adds a 150ms reset timeout. Electrical behavior and application suitability differ despite mechanical compatibility.