Analog Devices Inc./Maxim Integrated MAX6338OUB-T

Overview

MAX6338OUB-T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, monitoring +5.0V, +3.3V, adjustable (via resistor divider), and -5.0V supplies with factory-trimmed thresholds, 10% supply tolerance, 25µA typical supply current, and open-drain active-low outputs - deployed in telecom power sequencing and industrial control systems.

For engineers reviewing the MAX6338OUB-T datasheet, MAX6338OUB-T pinout, MAX6338OUB-T application, or MAX6338OUB-T equivalent, this page delivers verified threshold voltages (+5.0V/-5%), package dimensions (10-pin µMAX), output behavior (wire-ORable open-drain), temperature range (-40°C to +85°C), and real-world supervisory use cases without external components.

Technical Context

The MAX6338OUB-T integrates four independent comparators, each with a precision internal 1.23V bandgap reference and factory-set resistive dividers for IN1 (+5.0V), IN2 (+3.3V), IN3 (adjustable), and IN4 (-5.0V). Threshold hysteresis is built-in at 0.3%, eliminating external feedback networks.

All outputs are open-drain with weak 10µA internal pull-ups to VCC, enabling wire-OR configuration into a single "power good" signal; undervoltage lockout forces all outputs low when VCC drops below +2.5V, ensuring reliable reset assertion during brownout conditions.

Key Specifications

Pinout & Package

MAX6338OUB-T 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 version (suffix +).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6338OUB-T, MAX6339OUB-T offers tighter threshold accuracy at the expense of reduced margin for noisy rails, while TPS3307-33DGNR sacrifices one monitoring channel and negative-voltage capability - making MAX6338OUB-T uniquely balanced for legacy multirail systems requiring -5V support and 10% tolerance robustness.

Availability

MAX6338OUB-T is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial PLCs, desktop motherboard designs, and networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6338OUB-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, communications, and computing markets.

The MAX6338OUB-T belongs to Maxim's precision voltage supervisor product line, engineered specifically for reliable, low-power, multirail power-system monitoring in space-constrained and thermally demanding applications.

FAQ

What input voltage combinations does the MAX6338OUB-T support?

The MAX6338OUB-T monitors +5.0V (IN1), +3.3V (IN2), an adjustable voltage (IN3, set via external resistor divider referenced to 1.23V), and -5.0V (IN4). Its Selector Guide confirms this exact configuration for the "O" variant, with 10% tolerance on all fixed thresholds. No reconfiguration is possible post-manufacture.

Does the MAX6338OUB-T require external pull-up resistors on its outputs?

No - the MAX6338OUB-T features weak 10µA internal pull-ups to VCC on all four open-drain outputs (OUT1–OUT4). External pull-ups are optional and only needed if interfacing with logic families requiring higher drive strength or different voltage levels (e.g., 3.3V logic driven from a 5V VCC).

How does the MAX6338OUB-T handle undervoltage on its own VCC supply?

The MAX6338OUB-T includes an internal undervoltage lockout circuit that forces all four outputs low whenever VCC drops below +2.5V. This ensures clean, predictable reset assertion during brownout conditions - critical for preventing metastability in downstream microcontrollers or FPGAs.

Can the adjustable input (IN3) of the MAX6338OUB-T monitor voltages above +5.5V?

No - the absolute maximum input voltage rating for IN3 (and all non–negative inputs) is +6V. To monitor voltages above +5.5V, an external resistor divider must scale the input down to ≤+6V while maintaining sufficient signal-to-noise ratio and ensuring the divided voltage remains within the device's specified input range relative to the 1.23V reference.

Is the MAX6338OUB-T pin-compatible with other variants in the MAX6338 family?

Yes - all MAX6338 variants (e.g., MAX6338AUB-T through MAX6338PUB-T) share identical 10-pin µMAX packaging and pinout. The only differences are factory-programmed threshold voltages and tolerances; no PCB layout changes are required when substituting within the same package suffix (e.g., U-B).