Analog Devices Inc./Maxim Integrated MAX6377XR28+T

Overview

MAX6377XR28+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 2.80V threshold (±2.5% over temperature), 500nA supply current, and operates down to 1V VCC. It asserts OUT low when VCC falls below threshold and is used in portable equipment power sequencing and Li+-battery undervoltage lockout.

For engineers reviewing the MAX6377XR28+T datasheet, MAX6377XR28+T pinout, MAX6377XR28+T application, or MAX6377XR28+T equivalent, key selection criteria include reset threshold accuracy, open-drain output compatibility with mixed-voltage logic, immunity to sub-20µs VCC transients, and SC70-3 footprint constraints in space-constrained designs.

Technical Context

The MAX6377XR28+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.80V trip point. Its open-drain output requires an external pull-up and sinks ≥100µA when asserted, enabling flexible interface to 1.8V–5.5V logic domains.

It ignores fast negative-going VCC transients up to 20µs at 100mV overdrive, ensuring glitch immunity without external filtering. All internal circuitry remains functional down to 1V VCC, supporting brown-out detection during deep discharge or cold-start conditions.

Key Specifications

Pinout & Package

MAX6377XR28+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for ultra-compact PCB layouts in wearables and IoT sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB28DBZR and APX803S-28SA-7, the MAX6377XR28+T uniquely combines SC70-3 size, guaranteed 1V operation, and documented 20µs transient immunity-making it optimal for ultra-low-power, space-constrained, and harsh-environment applications where robust brown-out response is critical.

Availability

MAX6377XR28+T is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, smart asset tags, and industrial wireless sensors requiring stable component supply and long-lifecycle support.

Supply support for MAX6377XR28+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 management, sensing, and interface applications in industrial, automotive, and consumer markets.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical systems, emphasizing nanoscale supply current, factory-trimmed accuracy, and robust transient rejection in minimal footprints.

FAQ

What is the exact reset threshold voltage of the MAX6377XR28+T?

The MAX6377XR28+T has a factory-trimmed nominal reset threshold of 2.80V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (–40°C to +85°C). This value is laser-trimmed during manufacturing and does not require external calibration. The MAX6377XR28+T achieves this specification using an internal bandgap reference and precision comparator architecture.

Does the MAX6377XR28+T support operation below 1.8V VCC?

Yes, the MAX6377XR28+T is fully functional down to 1.2V VCC and guarantees correct output logic state (active-low assertion) for VCC as low as 1V. This enables reliable undervoltage detection during deep battery discharge in primary lithium and alkaline systems. The MAX6377XR28+T maintains 500nA supply current and 2.80V threshold accuracy even at these low supply levels.

What pull-up resistor value should be used with the MAX6377XR28+T's open-drain output?

A pull-up resistor between 10kΩ and 100kΩ is recommended for the MAX6377XR28+T's open-drain OUT pin, depending on rise-time requirements and bus capacitance. With ISINK ≥100µA guaranteed, a 47kΩ resistor to 3.3V yields ~3.2V logic high and <5µs rise time under typical loads. The MAX6377XR28+T tolerates pull-up voltages up to 5.5V, enabling direct interface to higher-voltage logic domains.

How does the MAX6377XR28+T handle short VCC transients?

The MAX6377XR28+T rejects negative-going VCC transients up to 20µs wide when the overdrive (VTH – VCC) is 100mV, per its Typical Operating Characteristics graph. This built-in immunity eliminates the need for external RC filters in most portable applications. The MAX6377XR28+T achieves this through internal timing control and comparator hysteresis, ensuring no false resets during switching noise or load dumps.

Is the MAX6377XR28+T available in lead-free packaging?

Yes, the "+T" suffix in MAX6377XR28+T explicitly denotes lead-free, RoHS-compliant packaging. It uses matte-tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) requirements. The MAX6377XR28+T is supplied in tape-and-reel format only, with standard reel quantities aligned to Aetrix Electronics' distribution logistics for SMT assembly lines.