Analog Devices Inc./Maxim Integrated MAX6339DUT+T

Overview

MAX6339DUT+T from Maxim Integrated is a quad voltage supervisory IC that monitors +5.0V (−5%), +3.3V (−5%), +1.8V (−5%), and one user-adjustable input (1.23V internal reference) in multi-rail systems. It delivers a single active-low open-drain RESET output with 140ms minimum timeout, operates from IN2 supply (1.0V to 5.5V), and draws only 55µA typical supply current. It is used in desktop computers and networking equipment for reliable power-on reset and brownout detection.

For engineers reviewing the MAX6339DUT+T datasheet, MAX6339DUT+T pinout, MAX6339DUT+T application, or MAX6339DUT+T equivalent, key selection criteria include factory-trimmed −5% thresholds for three fixed rails, adjustable fourth input, guaranteed operation down to IN1/IN2 = 1V, immunity to short transients (<1µs at 50mV overdrive), and SOT23-6 packaging for space-constrained embedded designs.

Technical Context

The MAX6339DUT+T integrates four precision comparators with an internal bandgap reference (1.23V) and factory-trimmed resistor-divider networks for fixed thresholds. Each comparator features 0.3% hysteresis to reject noise without compromising accuracy at threshold crossing.

It uses IN2 as both power supply and internal pullup source for the open-drain RESET output (10µA typ). RESET remains valid as long as IN1 ≥ 1V or IN2 ≥ 1V - enabling robust reset assertion during partial rail collapse. The device ignores transients ≤ 1µs when overdriven by ≥50mV, per glitch immunity characterization.

Key Specifications

Pinout & Package

The MAX6339DUT+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6339DUT+T, the MAX6340DUT+T offers extended reset timing without functional or pinout change, while the TPS3307-33D sacrifices rail count, adjustability, and package size - making MAX6339DUT+T optimal for compact, four-rail systems needing precise −5% tolerance and design flexibility.

Availability

MAX6339DUT+T is available at Aetrix Electronics and suitable for desktop computers, networking equipment, and data storage equipment requiring stable component supply, guaranteed −40°C to +85°C operation, and SOT23-6 footprint compatibility.

Supply support for MAX6339DUT+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, mixed-signal, and power management ICs for industrial, computing, and communications applications.

The MAX6339 series delivers compact, low-power quad voltage supervision for multi-rail systems - targeting reliability-critical applications where space, power, and deterministic reset behavior are essential.

FAQ

What voltage rails does the MAX6339DUT+T monitor?

The MAX6339DUT+T monitors +5.0V (−5% threshold), +3.3V (−5%), +1.8V (−5%), and one user-adjustable input referenced to its internal 1.23V bandgap. This configuration is explicitly defined in the Selector Guide for the "D" variant and confirmed in the Electrical Characteristics table for V_TH values of 4.75V, 3.15V, and 1.53V (min).

Does the MAX6339DUT+T require external components to operate?

No - the MAX6339DUT+T requires zero external components for its three fixed-threshold inputs. Only the fourth (adjustable) input needs an external resistor divider to set a custom threshold. Its open-drain RESET output includes a 10µA internal pullup to IN2, eliminating the need for an external pullup resistor in most 3.3V/5V logic interfacing scenarios.

What is the minimum supply voltage needed for the MAX6339DUT+T to assert RESET reliably?

The MAX6339DUT+T guarantees RESET output validity as long as either IN1 ≥ 1V or IN2 ≥ 1V. This is specified in Note 3 of the Electrical Characteristics table and enables fail-safe reset assertion during deep brownout conditions where other supervisors may lose functionality.

How does the MAX6339DUT+T handle short voltage transients on monitored inputs?

The MAX6339DUT+T rejects transients ≤ 1µs duration when overdriven by ≥50mV beyond threshold, as shown in the MAX6339toc04 Typical Operating Characteristic graph. This built-in glitch immunity prevents false resets in electrically noisy environments like switching power supplies or motor-driven systems.

Is the MAX6339DUT+T pin-compatible with other variants in the MAX6339 family?

Yes - all MAX6339 variants, including MAX6339DUT+T, share identical 6-pin SOT23-6 pinout and pin functions (IN1, IN2, IN3, IN4, GND, RESET). Differences are limited to internal threshold configurations and reset timeout specifications, with no impact on PCB layout or interconnect design.