Analog Devices Inc./Maxim Integrated MAX6377UR27

Overview

MAX6377UR27 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 2.700V threshold (±2.5% over temperature), 500nA supply current, and operates from 1.2V to 5.5V 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 MAX6377UR27 datasheet, MAX6377UR27 pinout, MAX6377UR27 application, or MAX6377UR27 equivalent, key selection criteria include its 2.700V trip point, open-drain output compatibility with mixed-voltage logic, immunity to sub-20µs VCC transients, and SOT23-3 footprint suitability for space-constrained designs.

Technical Context

The MAX6377UR27 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.700V detection threshold. Its open-drain output requires an external pullup and sinks up to 100µA while asserted, enabling flexible interfacing with logic supplies up to 5.5V.

It guarantees correct output state down to 1.0V VCC and rejects fast negative-going transients - propagation delay is 6.3µs (typ) with hysteresis of 0.1mV, and maximum transient immunity is defined by threshold overdrive (e.g., 100mV overdrive tolerates ≤140µs glitches).

Key Specifications

Pinout & Package

MAX6377UR27 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB27DBZR and APX803S-27SA-7, the MAX6377UR27 offers optimal trade-off between ultra-low 500nA current, open-drain flexibility for multi-voltage systems, and robust 2.700V detection with guaranteed 1V operation - making it preferred for battery-critical portable designs requiring both longevity and interface adaptability.

Availability

MAX6377UR27 is available at Aetrix Electronics and suitable for portable medical devices, IoT edge nodes, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for MAX6377UR27 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in space- and energy-constrained portable systems, delivering precision thresholds and minimal ICC in miniature SC70/SOT23 packages.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6377UR27?

The MAX6377UR27 has a nominal threshold voltage of 2.700V, with ±2.5% accuracy over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "R27". The actual measured VTH at +25°C falls between 2.660V (min) and 2.741V (max), and over temperature between 2.633V and 2.768V.

Does the MAX6377UR27 require an external pullup resistor on the OUT pin?

Yes, the MAX6377UR27 features an open-drain output and requires an external pullup resistor connected between OUT and the target logic supply (up to 5.5V). Typical values range from 10kΩ to 100kΩ depending on rise-time requirements and bus loading. The datasheet specifies that VOL ≤ 0.4V at ISINK = 100µA, confirming compatibility with standard CMOS logic levels.

Can the MAX6377UR27 operate reliably below 2.0V VCC?

Yes, the MAX6377UR27 is fully specified to operate and assert correct output logic down to 1.0V VCC. Its internal bandgap and comparator remain functional across the entire 1.2V to 5.5V VCC range, and the output state is guaranteed valid even during deep brownout - a critical feature for battery-failure detection in systems powered by single-cell Li+ or alkaline sources.

What is the propagation delay of the MAX6377UR27, and how does temperature affect it?

The typical propagation delay of the MAX6377UR27 is 6.3µs (falling edge, VCC crossing VTH downward) at +25°C. Over temperature (-40°C to +85°C), delay varies minimally: the datasheet shows <10% change across the range, with worst-case values remaining under 8µs. This stability ensures predictable reset timing in industrial and automotive-adjacent applications.

Is the MAX6377UR27 pin-compatible with other members of the MAX6375–MAX6380 family in SOT23-3?

Yes, all MAX6375–MAX6380 variants in the SOT23-3 package (e.g., MAX6377UR27, MAX6375UR22, MAX6378UR33) share identical pinout: Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC. This allows direct substitution within the same package type when changing threshold or output configuration - provided the system design accommodates the specific output logic (open-drain vs. push-pull) and threshold requirement.