Analog Devices Inc./Maxim Integrated MAX6338JUB

Overview

The 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 5% tolerance thresholds, consuming only 25µA typical supply current, operating from +2.5V to +5.5V VCC, and delivering four independent open-drain active-low outputs in a 10-pin µMAX package-used in desktop computers and networking equipment for power-good signaling and supply fault detection.

For engineers reviewing the MAX6338JUB datasheet, MAX6338JUB pinout, MAX6338JUB application, or MAX6338JUB equivalent, this page delivers verified threshold voltages (+5.0V/−5%, +3.3V/−5%, +2.5V/−10%, +1.8V/−10%), internal 1.23V bandgap reference accuracy, −40°C to +85°C guaranteed operation, wire-ORable outputs, and undervoltage lockout behavior below 2.5V VCC.

Technical Context

The MAX6338JUB implements four independent comparators, each with factory-trimmed resistive dividers setting precise trip points for nominal input voltages; the +2.5V and +1.8V inputs are configured for 5% tolerance (per Selector Guide), meaning their thresholds are −5% of nominal (2.375V and 1.71V respectively), not −10%. All comparators reference an internal 1.23V bandgap with 60ppm/°C temperature coefficient.

Each output is open-drain with a 10µA weak internal pull-up to VCC, enabling direct wire-OR connection without external components; an integrated undervoltage lockout forces all outputs low when VCC drops below 2.5V, ensuring reliable reset assertion during brownout conditions across the full −40°C to +85°C range.

Key Specifications

Pinout & Package

The MAX6338JUB is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height), thermally enhanced with exposed pad (not electrically connected), compatible with standard surface-mount reflow processes.

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 provides four factory-set 5%-tolerance thresholds including +5.0V, full rail independence, and wire-OR capability - making it optimal for compact, multirail systems where pin count and component count are critical.

Availability

MAX6338JUB is available at Aetrix Electronics and suitable for desktop computers, networking equipment, and industrial PLC controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

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, mixed-signal, and power management ICs for industrial, computing, communications, and automotive markets.

The MAX6338JUB belongs to Maxim's voltage supervisor product line, engineered specifically for high-accuracy, low-quiescent-current multirail monitoring in space-constrained embedded systems.

FAQ

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

The MAX6338JUB has four fixed thresholds: IN1 = +5.0V at −5% (4.63V), IN2 = +3.3V at −5% (3.08V), IN3 = +2.5V at −5% (2.375V), and IN4 = +1.8V at −5% (1.71V). These values are laser-trimmed at wafer test and guaranteed over temperature per the Electrical Characteristics table.

Does MAX6338JUB require external pull-up resistors on its outputs?

No - the MAX6338JUB integrates 10µA weak pull-ups to VCC on all four open-drain outputs (OUT1–OUT4), enabling direct wire-OR connection without external components. External pull-ups may be added to override the internal ones, but are not required for basic operation.

How does the undervoltage lockout (UVLO) function in MAX6338JUB?

The MAX6338JUB's UVLO circuit monitors VCC and forces all four outputs low whenever VCC drops below 2.5V. This behavior remains active down to VCC = 1V, ensuring robust reset assertion during power-down sequences and brownout events across the full −40°C to +85°C range.

Can MAX6338JUB monitor negative voltages like −5.0V?

No - the MAX6338JUB variant JUB is configured for +5.0V, +3.3V, +2.5V, and +1.8V inputs only. The −5.0V monitoring capability is available only in other variants (e.g., MAX6338MUB, MAX6338NUB) and is not implemented in the MAX6338JUB pin configuration or internal divider network.

Is the MAX6338JUB pin-compatible with other MAX6338 variants in the µMAX package?

Yes - all MAX6338 variants (AUB through PUB) share identical 10-pin µMAX pinout and footprint. The only differences are factory-programmed threshold voltages and tolerances; no PCB layout change is needed when substituting between variants, provided the input voltage assignments match the design requirements.