Analog Devices Inc./Maxim Integrated MAX6338JUB+T

Overview

MAX6338JUB+T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, +2.5V (10% tolerance), and +1.8V (5% tolerance) supplies with factory-trimmed thresholds, 25µA typical supply current, and open-drain active-low outputs in a 10-pin µMAX package - used in desktop/notebook computers and data storage equipment.

For engineers reviewing the MAX6338JUB+T datasheet, MAX6338JUB+T pinout, MAX6338JUB+T application, or MAX6338JUB+T equivalent, key selection criteria include verified 5% tolerance thresholds on IN3 (+2.5V) and IN4 (+1.8V), guaranteed -40°C to +85°C operation, wire-ORable open-drain outputs, and internal 1.23V bandgap reference accuracy.

Technical Context

The MAX6338JUB+T integrates four independent comparators, each with its inverting input tied to an internal 1.23V bandgap reference and noninverting inputs connected via factory-laser-trimmed resistor dividers to set nominal thresholds. It uses BiCMOS process technology (620 transistors) and includes undervoltage lockout that forces all outputs low when VCC drops below 2.5V.

All four outputs are open-drain with weak 10µA internal pull-ups to VCC, enabling direct wire-OR connection without external components. Threshold hysteresis is built-in at 0.3%, eliminating need for external feedback resistors - unlike standard comparators requiring external hysteresis networks.

Key Specifications

Pinout & Package

MAX6338JUB+T is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), lead-free compliant, with exposed pad for thermal enhancement and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6338JUB+T, MAX6340EUB+ trades 5% tolerance and 25µA current for lower cost, while TPS3307-33DGNR sacrifices one monitoring channel and threshold precision to reduce footprint - neither offers pin-compatible replacement.

Availability

MAX6338JUB+T is available at Aetrix Electronics and suitable for desktop/notebook computers, data storage equipment, and telecommunications infrastructure requiring stable component supply and guaranteed long-term manufacturability.

Supply support for MAX6338JUB+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 demanding industrial, computing, and communications applications.

The MAX6338 family delivers integrated multirail supervision with factory-trimmed thresholds and ultra-low quiescent current - engineered specifically for space- and power-constrained computing and storage platforms.

FAQ

What is the exact threshold voltage for the +1.8V input on MAX6338JUB+T?

The +1.8V input (IN4) on MAX6338JUB+T is factory-trimmed for a -5% tolerance trip point, meaning it asserts low when the input falls below 1.71V (1.8V × 0.95). Electrical Characteristics table confirms VTH = 1.53V (min), 1.58V (typ), 1.62V (max) at TA = +25°C, with full -40°C to +85°C guarantee.

Does MAX6338JUB+T support wire-OR connection of all four outputs?

Yes, MAX6338JUB+T supports wire-OR connection: all four outputs (OUT1–OUT4) are open-drain with weak 10µA internal pull-ups to VCC, allowing them to be tied together externally to generate a single active-low "power good" signal - no external diodes or logic gates required.

Can MAX6338JUB+T monitor negative voltages like -5.0V?

No, MAX6338JUB+T does not monitor -5.0V. Its IN1–IN4 inputs are configured for +5.0V, +3.3V, +2.5V, and +1.8V (all with 5% tolerance), as confirmed in the Selector Guide. The -5.0V option appears only in variants like MAX6338MUB/N/PUB - not in MAX6338JUB+T.

What is the maximum sink current capability of MAX6338JUB+T outputs?

Each output of MAX6338JUB+T can sink up to 20mA continuously, as specified in Absolute Maximum Ratings. At VCC = +5V and ISINK = 2mA, VOL is guaranteed ≤ 0.4V; at VCC = +2.5V and ISINK = 1.2mA, VOL remains ≤ 0.4V - ensuring reliable logic-low assertion into standard CMOS loads.

Is an external bypass capacitor required for MAX6338JUB+T?

Yes, a 0.1µF ceramic capacitor is recommended between VCC and GND, placed as close as possible to the MAX6338JUB+T pins. This bypassing suppresses high-frequency noise on the supply rail, preventing false trips - especially critical in electrically noisy environments like data storage or telecom chassis.