Analog Devices Inc./Maxim Integrated MAX6377XR29+T

Overview

MAX6377XR29+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed threshold of 2.93V ±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 and brownout detection in Li+-powered microcontroller systems.

For engineers reviewing the MAX6377XR29+T datasheet, MAX6377XR29+T pinout, MAX6377XR29+T application, or MAX6377XR29+T equivalent, key selection criteria include threshold accuracy over temperature, open-drain output compatibility with mixed-voltage logic, transient immunity against sub-100µs VCC glitches, and SC70-3 footprint constraints in space-constrained battery management circuits.

Technical Context

The MAX6377XR29+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 2.93V trip point. Its open-drain output requires an external pull-up and remains low during undervoltage conditions, supporting flexible logic-level interfacing up to 5.5V.

It features built-in immunity to fast negative-going VCC transients (≤100µs at 20mV overdrive), operates reliably from 1V to 5.5V supply, and guarantees correct output state across –40°C to +85°C without external components or trimming.

Key Specifications

Pinout & Package

MAX6377XR29+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for ultra-compact portable designs. 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 TLV803EB29DPWR and APX803S-29SA-7, the MAX6377XR29+T uniquely combines SC70-3 packaging, open-drain output, and 500nA ICC - making it optimal for ultra-dense, multi-rail portable designs where layout area and interface flexibility are constrained.

Availability

MAX6377XR29+T is available at Aetrix Electronics and suitable for portable medical sensors, wearables power sequencing, and industrial telematics modems requiring stable component supply, long-lifecycle support, and lead-free compliance.

Supply support for MAX6377XR29+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 connectivity in demanding environments.

The MAX6375–MAX6380 family delivers ultra-low-power voltage supervision for battery-critical systems, targeting applications where size, current draw, and threshold accuracy outweigh cost sensitivity.

FAQ

What is the exact reset threshold voltage of MAX6377XR29+T and how tightly is it specified?

The MAX6377XR29+T has a factory-trimmed nominal reset threshold of 2.93V, guaranteed over temperature at ±2.5% (2.857V to 3.000V from –40°C to +85°C). This specification is confirmed in Table 1 of the official datasheet and applies directly to the R29 suffix variant. The MAX6377XR29+T uses internal laser trimming to achieve this accuracy without external components.

Does MAX6377XR29+T support operation below 2.0V, and what is its minimum functional VCC?

Yes, the MAX6377XR29+T is fully functional down to 1.0V VCC and guarantees correct output logic state (active-low assertion when VCC < 2.93V) across the entire 1.0V–5.5V range. This capability is explicitly stated in the General Description and Electrical Characteristics sections, enabling use in deep brownout detection scenarios where other detectors fail.

What package type does MAX6377XR29+T use, and is it RoHS-compliant?

The MAX6377XR29+T uses the SC70-3 package (2.0mm × 2.1mm × 0.9mm) and is supplied in lead-free form, as indicated by the "+T" suffix per Maxim's ordering convention. The "+T" denotes lead-free tape-and-reel packaging compliant with RoHS Directive 2011/65/EU, verified in the Ordering Information section of the datasheet.

How does the open-drain output of MAX6377XR29+T interface with different logic families?

The MAX6377XR29+T open-drain OUT pin requires an external pull-up resistor to any voltage rail up to 5.5V, enabling direct interfacing with 1.8V, 2.5V, 3.3V, or 5V logic inputs. This architecture avoids level shifters and supports wired-OR configurations - a key advantage over push-pull alternatives like the MAX6376 series, and explicitly detailed in the Applications Information section.

What is the maximum transient duration that MAX6377XR29+T can ignore, and under what conditions?

The MAX6377XR29+T rejects negative-going VCC transients up to 100µs in duration when the overdrive (VTH – VCC) is 20mV, as shown in Figure MAX6375-04. Immunity decreases with larger overdrive - e.g., at 100mV overdrive, max tolerable transient drops to ~20µs. This behavior is inherent to the internal comparator design and documented in Typical Operating Characteristics.