Analog Devices Inc./Maxim Integrated MAX6377XR31

Overview

MAX6377XR31 from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector optimized for battery and power-supply monitoring in portable systems. It features a factory-trimmed 3.08V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to 1V VCC. Its primary circuit role is system reset assertion during brownout conditions in space-constrained applications such as wearables and IoT sensors.

For engineers reviewing the MAX6377XR31 datasheet, MAX6377XR31 pinout, MAX6377XR31 application, or MAX6377XR31 equivalent, key selection considerations include its SC70-3 open-drain output configuration, 3.08V trip point, transient immunity up to 140µs at 10mV overdrive, and compatibility with 1.2V–5.5V logic pull-up voltages.

Technical Context

The MAX6377XR31 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.08V detection threshold. It asserts an active-low signal on the open-drain OUT pin when VCC falls below VTH, requiring an external pull-up resistor for logic-level translation.

Designed for immunity to fast transients, it ignores negative-going VCC glitches shorter than 140µs at 10mV overdrive (VTH − VCC), and guarantees correct output state down to 1V supply. Its propagation delay is 6.3µs (typ) under full temperature range (−40°C to +85°C).

Key Specifications

Pinout & Package

MAX6377XR31 is housed in a 3-pin SC70-3 package (2.0mm × 1.25mm × 0.9mm), optimized for ultra-compact PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB31DBZR and APX803S-31SA-7, the MAX6377XR31 uniquely combines SC70-3 packaging, 500nA current, guaranteed 1V operation, and documented transient immunity - making it optimal for miniaturized, long-life, and noise-prone applications where those attributes are non-negotiable.

Availability

MAX6377XR31 is available at Aetrix Electronics and suitable for wearable health monitors, smart sensor nodes, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and consistent SC70-3 packaging.

Supply support for MAX6377XR31 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and consumer systems.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in battery-critical portable equipment, emphasizing minimal current draw, factory-trimmed thresholds, and robust transient rejection.

FAQ

What is the exact reset threshold voltage of MAX6377XR31 and how accurate is it over temperature?

The MAX6377XR31 has a nominal reset threshold of 3.08V, with ±2.5% accuracy guaranteed over the full operating temperature range of −40°C to +85°C. This specification is confirmed in Table 1 of the datasheet, where suffix "R31" explicitly maps to 3.08V (min 3.003V, max 3.150V at temperature extremes). The device achieves this via laser-trimmed internal resistors and a precision bandgap reference, eliminating need for external calibration.

Does MAX6377XR31 support operation below 1.2V VCC, and what is its minimum functional supply voltage?

Yes, MAX6377XR31 is guaranteed to maintain correct output logic state down to 1V VCC, as stated in the General Description and Electrical Characteristics sections. While the recommended operating range starts at 1.2V, the device continues asserting the active-low reset signal reliably even as VCC declines to 1V - a critical feature for graceful shutdown in deeply discharged battery scenarios.

What package type and dimensions does MAX6377XR31 use, and is it compatible with standard reflow profiles?

MAX6377XR31 uses the SC70-3 package (2.0mm × 1.25mm × 0.9mm body size), with pin pitch of 0.65mm. It is RoHS-compliant and qualified for standard lead-free reflow soldering per JEDEC J-STD-020. The package drawing is documented in the "Package Information" section, and Maxim confirms compatibility with industry-standard thermal profiles for small-outline packages.

How does the open-drain output of MAX6377XR31 interface with different logic families, and what pull-up voltage can be used?

The open-drain OUT pin of MAX6377XR31 can be pulled up to any voltage between 1.2V and 5.5V, enabling direct interfacing with 1.8V, 3.3V, or 5V logic systems. A typical 10kΩ pull-up resistor suffices for most microcontroller reset inputs; the datasheet specifies VOL ≤0.4V at ISINK = 100µA, ensuring solid logic-low assertion across the full VCC range.

What is the maximum duration of a VCC transient that MAX6377XR31 will ignore, and how does it vary with overdrive?

MAX6377XR31 ignores negative-going VCC transients up to 140µs in duration when the overdrive (VTH − VCC) is 10mV, as shown in Figure MAX6375-04. As overdrive increases - e.g., to 100mV - the maximum tolerable pulse width decreases to approximately 20µs. This transient immunity is built into the internal comparator design and does not require external filtering.