Analog Devices Inc./Maxim Integrated MAX6338JUB+

Overview

MAX6338JUB from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, +2.5V, and +1.8V supplies with factory-trimmed 5% tolerance thresholds. It features four independent open-drain active-low outputs, consumes only 25µA typical supply current, and operates from +2.5V to +5.5V across –40°C to +85°C - used in desktop computers and networking equipment for reliable power-good signaling.

For engineers reviewing the MAX6338JUB datasheet, MAX6338JUB pinout, MAX6338JUB application, or MAX6338JUB equivalent, this page delivers verified threshold voltages (4.75V/3.15V/2.63V/1.58V), µMAX package dimensions, wire-OR output capability, undervoltage lockout behavior below 2.5V, and confirmed compatibility with 1.8V/2.5V/3.3V/5.0V rail monitoring in industrial and computing systems.

Technical Context

The MAX6338JUB integrates four precision comparators sharing a stable 1.23V bandgap reference, with each input connected via internal resistor dividers preset for nominal +5.0V, +3.3V, +2.5V, and +1.8V monitoring at 5% tolerance. Threshold hysteresis is built-in (0.3%), eliminating external feedback networks.

All outputs are open-drain with 10µA weak internal pull-ups to VCC, enabling direct wire-OR connection to generate a single system reset or power-good signal. An undervoltage lockout circuit forces all outputs low when VCC drops below 2.5V, ensuring deterministic behavior during brownout conditions.

Key Specifications

Pinout & Package

The MAX6338JUB is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), RoHS-compliant and available in lead-free format (denoted by '+' suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6337JUB+ and TPS3307-33DGNR, the MAX6338JUB uniquely delivers four factory-configured, 5%-tolerance thresholds in one µMAX package - simplifying design for full multirail supervision without compromise on rail count or accuracy.

Availability

MAX6338JUB is available at Aetrix Electronics and suitable for desktop computers, networking equipment, and industrial embedded controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for MAX6338JUB 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 management, sensing, and interface applications - emphasizing high reliability and integration density.

The MAX6338JUB belongs to Maxim's voltage supervisor product line, engineered specifically for compact, low-power multivoltage system monitoring in computing and communications infrastructure where rail count, accuracy, and footprint are critical.

FAQ

What are the exact factory-trimmed threshold voltages for MAX6338JUB?

The MAX6338JUB has four fixed thresholds: IN1 = +5.0V (–5% = 4.75V), IN2 = +3.3V (–5% = 3.15V), IN3 = +2.5V (–5% = 2.63V), and IN4 = +1.8V (–5% = 1.58V). These values are trimmed at wafer test and guaranteed over –40°C to +85°C per the datasheet's Electrical Characteristics table. The MAX6338JUB does not support adjustable thresholds - that capability applies only to variants with "Adj*" in the Selector Guide (e.g., MAX6338AUB).

Can MAX6338JUB outputs be wire-ORed together, and what pull-up voltage is supported?

Yes, all four outputs of the MAX6338JUB are open-drain with 10µA internal pull-ups to VCC, enabling direct wire-OR connection. External pull-ups can be applied to any voltage from 0V to +5.5V - internal circuitry blocks current flow from external pull-up to VCC, preventing backfeeding. This allows interfacing with 1.8V, 3.3V, or 5V logic families without level shifters.

Does MAX6338JUB include hysteresis, and how does it affect trip accuracy?

Yes, the MAX6338JUB includes built-in 0.3% hysteresis per comparator - meaning the release threshold is ~0.3% above the trip threshold. For example, with a 3.15V trip point on IN2, the release occurs near 3.16V. This prevents output oscillation near threshold due to noise or slow-moving supply edges, eliminating need for external hysteresis resistors while maintaining precise fault detection.

What happens to MAX6338JUB outputs when VCC drops below 2.5V?

When VCC falls below 2.5V, the internal undervoltage lockout (UVLO) circuit forces all four outputs (OUT1–OUT4) low regardless of input voltage states. This ensures deterministic, fail-safe behavior during power-down or brownout - preventing floating or high outputs that could falsely assert "power good" in low-VCC conditions. Outputs remain low until VCC rises above 2.5V and stabilizes.

Is MAX6338JUB pin-compatible with other MAX6338 variants like MAX6338IUB or MAX6338HUB?

No - while all MAX6338 variants share the same 10-pin µMAX package and pinout, their factory-programmed thresholds differ. MAX6338JUB monitors +5.0V/+3.3V/+2.5V/+1.8V at 5% tolerance, whereas MAX6338IUB uses 10% tolerance on the same rails, and MAX6338HUB monitors +5.0V/+3.0V/+1.8V/+1.8V. Swapping variants without verifying threshold alignment may cause incorrect fault detection or missed failures.