Analog Devices Inc./Maxim Integrated MAX6377XR27

Overview

MAX6377XR27 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 2.70V 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 microcontroller reset supervision.

For engineers reviewing the MAX6377XR27 datasheet, MAX6377XR27 pinout, MAX6377XR27 application, or MAX6377XR27 equivalent, key selection criteria include its 2.70V trip point, SC70-3 open-drain output configuration, -40°C to +85°C operating range, transient immunity, and compatibility with 1.2V–5.5V logic pull-ups.

Technical Context

The MAX6377XR27 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.70V detection threshold. Its open-drain output requires an external pull-up and sinks current only when asserted (VCC < VTH), enabling flexible interfacing across logic voltage domains up to 5.5V.

It ignores fast negative-going VCC transients-its propagation delay is 6.3µs (falling) and 9.5µs (rising), and it exhibits ±2.5% threshold accuracy from -40°C to +85°C with 40ppm/°C tempco. The device remains functional down to 1V VCC and draws only 500nA typical supply current.

Key Specifications

Pinout & Package

MAX6377XR27 is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is GND, Pin 2 is OUT (open-drain, active-low), and Pin 3 is 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 MAX6377XR27 offers optimal balance of ultra-low ICC, SC70 footprint, and proven transient immunity for portable consumer electronics-making it preferred where board space and battery life are primary constraints.

Availability

MAX6377XR27 is available at Aetrix Electronics and suitable for portable medical devices, wearables, and battery-powered IoT sensors requiring stable component supply, long-term lifecycle support, and consistent SC70-3 packaging.

Supply support for MAX6377XR27 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 without external components.

FAQ

What is the exact factory-trimmed threshold voltage of the MAX6377XR27?

The MAX6377XR27 has a nominal threshold voltage of 2.70V, with guaranteed tolerance of ±2.5% over the full -40°C to +85°C operating temperature range. At +25°C, the typical value is 2.70V, and the min/max spread is 2.633V to 2.768V per the datasheet's Table 1.

Does the MAX6377XR27 require an external pull-up resistor on its OUT pin?

Yes, the MAX6377XR27 features an open-drain active-low output, so an external pull-up resistor is mandatory to establish a defined HIGH state when the output is not asserted. The pull-up can connect to any voltage rail up to 5.5V, and resistor value must ensure VOL ≤0.4V at ISINK = 100µA per datasheet specifications.

Can the MAX6377XR27 operate reliably below 1.8V VCC?

Yes, the MAX6377XR27 is fully specified down to 1.2V VCC and guaranteed functional down to 1.0V. Its internal bandgap reference and comparator remain active and accurate even at these low voltages, making it suitable for monitoring partially discharged lithium batteries or low-voltage logic rails.

What is the maximum transient duration the MAX6377XR27 can ignore at 100mV overdrive?

At a threshold overdrive (VTH – VCC) of 100mV, the MAX6377XR27 can ignore negative-going VCC transients up to approximately 200µs in duration, as shown in Figure MAX6375-04 of the datasheet. This immunity prevents false resets during brief supply dips caused by switching noise or load surges.

Is the MAX6377XR27 available in lead-free packaging?

Yes, the MAX6377XR27 is available in lead-free packaging. To order the RoHS-compliant version, replace the "-T" suffix with "+T" in the part number (e.g., MAX6377XR27+T). Both leaded and lead-free variants use the same SC70-3 package outline and electrical specifications.