Analog Devices Inc./Maxim Integrated MAX6380UR36+T

Overview

MAX6380UR36+T from Maxim Integrated is an ultra-low-power, open-drain, active-low voltage detector designed for precision power-supply monitoring in battery-powered systems. It features a factory-trimmed 3.60V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V. Its role is to assert a logic-low output when VCC falls below the trip point-used in microcontroller reset supervision and load-switch enable control.

For engineers reviewing the MAX6380UR36+T datasheet, MAX6380UR36+T pinout, MAX6380UR36+T application, or MAX6380UR36+T equivalent, key selection criteria include threshold accuracy, open-drain drive capability, transient immunity, and compatibility with low-voltage logic interfaces requiring pull-up flexibility.

Technical Context

The MAX6380UR36+T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.60V detection threshold. It ignores fast negative-going VCC transients up to ~400µs (at 100mV overdrive), ensuring glitch immunity in noisy power environments.

This device belongs to the MAX6375–MAX6380 family of single-function voltage detectors. Unlike push-pull variants, it uses an open-drain output that sinks current when asserted-requiring an external pull-up resistor to interface with logic systems operating at voltages up to 5.5V.

Key Specifications

Pinout & Package

MAX6380UR36+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height-optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB36DBZR and TPS3808G33DBVR, the MAX6380UR36+T offers optimal trade-off between ultra-low current (500nA), precise 3.6V threshold, open-drain flexibility, and drop-in SOT23-3 compatibility-making it ideal for space- and power-constrained brown-out detection where pull-up voltage independence is critical.

Availability

MAX6380UR36+T is available at Aetrix Electronics and suitable for battery-powered medical wearables, industrial IoT nodes, portable instrumentation, and microcontroller-based embedded systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6380UR36+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.

The MAX6375–MAX6380 series was designed specifically for ultra-low-power voltage monitoring in portable and energy-harvesting applications-emphasizing nanoscale quiescent current, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6380UR36+T?

The MAX6380UR36+T has a factory-trimmed nominal reset threshold of 3.60V, 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 "R36", and applies specifically to the MAX6380UR36+T-not derived from interpolation or adjacent variants.

Does the MAX6380UR36+T require an external pull-up resistor on its OUT pin?

Yes-the MAX6380UR36+T features an open-drain active-low output, so an external pull-up resistor is mandatory to establish a valid logic-high state. The resistor value must be selected to ensure VOL ≤0.4V at ISINK = 100µA (per Electrical Characteristics), typically 10kΩ–100kΩ depending on bus capacitance and logic family requirements.

Can the MAX6380UR36+T operate reliably below 1.8V?

Yes-the MAX6380UR36+T is fully specified down to VCC = 1.2V and guaranteed functional to 1.0V. Its internal bandgap reference and comparator remain stable across this range, enabling use in ultra-low-voltage systems such as energy-harvesting nodes or partially discharged battery scenarios where other detectors fail.

What is the maximum transient duration the MAX6380UR36+T can ignore at 100mV overdrive?

At a threshold overdrive of 100mV (i.e., VCC = VTH − 100mV = 3.50V), the MAX6380UR36+T rejects transients up to approximately 400µs in duration, as shown in Figure MAX6375-04 of the datasheet. This immunity prevents false triggering during brief supply dips caused by switching noise or load transients.

Is the MAX6380UR36+T pin-compatible with other devices in the MAX6375–MAX6380 family?

Yes-the MAX6380UR36+T shares identical SOT23-3 pinout (GND, OUT, VCC) with all UR-suffix variants in the MAX6375–MAX6380 family, including MAX6375URxx+T through MAX6380URxx+T. This allows direct substitution within the same threshold group without PCB changes, provided the output logic type (open-drain) and threshold match system requirements.