Analog Devices Inc./Maxim Integrated MAX6380UR46+T

Overview

MAX6380UR46+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector with a factory-trimmed 4.63V threshold, ±2.5% accuracy over temperature, 500nA supply current, and operation down to 1V VCC - designed for precision power-supply monitoring in battery-backed microcontroller reset circuits.

For engineers reviewing the MAX6380UR46+T datasheet, MAX6380UR46+T pinout, MAX6380UR46+T application, or MAX6380UR46+T equivalent, this device serves as a reliable, single-function supply-voltage supervisor where low quiescent current, transient immunity, and guaranteed logic state below 1V are critical selection criteria.

Technical Context

The MAX6380UR46+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.63V trip point. It asserts an active-low output (open-drain) when VCC falls below threshold and maintains valid logic state down to 1V VCC.

It features built-in immunity to fast negative-going VCC transients - maximum allowable glitch duration decreases as threshold overdrive increases - and requires no external components for basic reset functionality. Its propagation delay is 9.5µs (typ) at +25°C with 200mV overdrive.

Key Specifications

Pinout & Package

MAX6380UR46+T is housed in a 3-pin SOT23-3 package (lead-free, tape-and-reel), with pin 1 = GND, pin 2 = OUT (open-drain), pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6315-46ARTZ-R7, the MAX6380UR46+T delivers the lowest quiescent current (500nA) and proven open-drain interoperability in space-constrained SOT23 designs, making it optimal for long-life battery systems requiring precise 4.63V supervision.

Availability

MAX6380UR46+T is available at Aetrix Electronics and suitable for battery-powered microcontrollers, DC/DC converter power-good signaling, and industrial sensor node brown-out protection requiring stable component supply and lead-free compliance.

Supply support for MAX6380UR46+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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.

The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage supervision in portable and energy-harvesting systems, prioritizing nanoscale ICC, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6380UR46+T?

The MAX6380UR46+T has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 1 of the datasheet under suffix "R46", and applies specifically to the MAX6380 variant with open-drain output configuration. The MAX6380UR46+T does not require external resistor networks to set this threshold.

Does the MAX6380UR46+T support operation below 1.2V VCC?

The MAX6380UR46+T is guaranteed to maintain correct output logic state down to 1V VCC, though its specified operating range begins at 1.2V. Below 1.2V, the device remains functional and continues asserting the active-low output if VCC stays below 4.63V, but parameters like propagation delay and leakage are not characterized. This 1V capability ensures reliable reset assertion during deep brown-out conditions before system collapse.

Can the MAX6380UR46+T be used with a 3.3V pull-up on the OUT pin?

Yes - the MAX6380UR46+T's open-drain OUT pin supports pull-up voltages from 1.8V to 5.5V, including 3.3V. When asserted (VCC < 4.63V), the output sinks up to 100µA while maintaining VOL ≤ 0.4V, ensuring solid logic-low compatibility with 3.3V CMOS inputs. No level-shifting circuitry is needed, simplifying interface design in mixed-voltage systems.

How does the MAX6380UR46+T handle short power supply transients?

The MAX6380UR46+T incorporates inherent immunity to fast negative-going VCC transients: it ignores glitches shorter than ~200µs at 100mV overdrive (VTH – VCC), as shown in Figure 4 of the datasheet. This prevents spurious resets caused by switching noise or load dumps, making it suitable for use in electrically noisy environments such as motor control or RF modules without added filtering.

Is the MAX6380UR46+T pin-compatible with other devices in the MAX6375–MAX6380 family?

Yes - all MAX6375–MAX6380 variants in SOT23-3 packaging share identical pinout: Pin 1 = GND, Pin 2 = OUT, Pin 3 = VCC. The MAX6380UR46+T is mechanically and electrically pin-compatible with MAX6375URxx+T through MAX6379URxx+T in the same package, enabling drop-in replacement when threshold voltage and output type match system requirements.