Analog Devices Inc./Maxim Integrated MAX6377XR26-T

Overview

MAX6377XR26-T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.63V ±2.5%, 500nA supply current, and operation down to 1V VCC. It monitors battery or regulated supply voltage in portable systems and asserts OUT low when VCC falls below threshold-used for reset generation in microcontroller-based battery-powered devices.

For engineers reviewing the MAX6377XR26-T datasheet, MAX6377XR26-T pinout, MAX6377XR26-T application, or MAX6377XR26-T equivalent, this device serves as a precision, single-function supply monitor requiring no external components, optimized for space-constrained, long-life applications where quiescent current and threshold accuracy are critical.

Technical Context

The MAX6377XR26-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.63V trip point. Its open-drain output sinks current when asserted and requires an external pull-up, enabling flexible logic-level interfacing up to 5.5V.

It features transient immunity: negative-going VCC glitches shorter than ~100µs (at 30mV overdrive) are rejected. Guaranteed correct output state down to 1V VCC ensures reliable operation during brownout and startup sequences in low-voltage systems.

Key Specifications

Pinout & Package

MAX6377XR26-T is housed in a 3-pin SC70 package (pin-compatible with SOT23-3 but smaller footprint), with GND on Pin 1, VCC on Pin 3, and open-drain OUT on Pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3801K26DBVR and APX803S-26SA-7, the MAX6377XR26-T delivers the lowest ICC (500nA) for longest battery runtime, retains open-drain flexibility for mixed-voltage systems, and matches the 2.63V trip point with verified ±2.5% industrial-temp performance - making it optimal for size- and energy-constrained designs.

Availability

MAX6377XR26-T is available at Aetrix Electronics and suitable for portable medical sensors, wearables with Li+ battery, industrial IoT edge nodes, and low-power remote sensors requiring stable component supply and long-term lifecycle support.

Supply support for MAX6377XR26-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, with emphasis on high reliability and low power.

The MAX6375–MAX6380 family was developed specifically for ultra-low-power voltage monitoring in battery-critical systems, eliminating external components while guaranteeing operation down to 1V and sub-µA quiescent current - targeting portable, medical, and industrial edge devices.

FAQ

What is the exact reset threshold voltage of the MAX6377XR26-T?

The MAX6377XR26-T has a factory-trimmed nominal reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (-40°C to +85°C). This value is confirmed in Table 1 of the datasheet, where suffix "R26" corresponds to 2.63V, and electrical characteristics specify min/typ/max bounds across temperature.

Does the MAX6377XR26-T require an external pull-up resistor on its OUT pin?

Yes, the MAX6377XR26-T features an open-drain active-low output, so an external pull-up resistor is mandatory to establish a valid logic-high level. The datasheet recommends selecting a resistor large enough to ensure VOL ≤0.4V at 100µA sink current, yet small enough to drive connected inputs - typical values range from 10kΩ to 100kΩ depending on bus capacitance and logic family.

Can the MAX6377XR26-T operate reliably at VCC = 1.2V?

Yes, the MAX6377XR26-T is fully specified to operate with VCC as low as 1.2V and guarantees correct output logic state down to 1V. Its internal bandgap and comparator remain functional across this range, enabling robust brownout detection even during deep battery discharge or low-voltage startup conditions.

What package type does the MAX6377XR26-T use, and is it pin-compatible with SOT23-3?

The MAX6377XR26-T uses the SC70-3 package (1.25mm × 0.8mm × 0.5mm), which shares identical pin numbering (GND–OUT–VCC) and pad layout with SOT23-3 but has a smaller footprint and thinner profile. While not mechanically interchangeable due to different land patterns, it is functionally and electrically pin-compatible for redesigns where space savings are critical.

How does the MAX6377XR26-T handle fast transients on the VCC line?

The MAX6377XR26-T incorporates built-in transient immunity: it ignores negative-going VCC glitches shorter than approximately 100µs when the overdrive (VTH – VCC) is 30mV, as shown in the "Maximum Transient Duration vs. Threshold Overdrive" graph. This prevents false resets caused by switching noise, ESD coupling, or load-step artifacts in noisy environments.