Analog Devices Inc./Maxim Integrated MAX14933AWE+

Overview

The MAX14933AWE+ from Maxim Integrated is a two-channel, 2.75kVRMS galvanic I²C digital isolator with bidirectional open-drain channels, 2.25V–5.5V dual-supply operation per side, DC–1.7MHz data rate, and -40°C to +125°C operating range-designed for isolated I²C/SMBus interfaces in industrial power supplies and battery management systems.

For engineers reviewing the MAX14933AWE+ datasheet, MAX14933AWE+ pinout, MAX14933AWE+ application, or MAX14933AWE+ equivalent, this page delivers verified isolation ratings (2.75kVRMS/630VPK), side-specific logic-low regulation (0.9V max on A-side), CMTI of 25kV/µs, thermal derating curves, and safety-limited current/power values critical for high-reliability embedded designs.

Technical Context

The MAX14933AWE+ implements proprietary BiCMOS isolation technology enabling robust galvanic separation between two independent power domains. Its A-side outputs feature regulated logic-low voltage (≤0.9V) with input threshold ≥50mV lower to prevent bus latch-up; B-side uses conventional buffers without regulation.

It supports clock-stretching I²C busses with independent VDDA/VDDB supplies (2.25V–5.5V), operates up to 1.7MHz, and maintains signal integrity under high common-mode transients (25kV/µs CMTI). Safety certifications include UL1577 (3750VRMS), VDE 0884-11 Basic Insulation, and IEC 61000-4-5 ±10kV surge.

Key Specifications

Pinout & Package

MAX14933AWE+ is housed in a 16-pin wide-body SOIC package (10.3mm × 7.5mm) with 8mm creepage and clearance, RoHS-compliant (W16M+8 package code).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C isolator applications.

Compared with ADUM1250ARZ-RL7 and SI8602ED-B-IS, the MAX14933AWE+ uniquely combines 2.75kVRMS isolation, built-in A-side latch-up prevention, and native clock-stretching support-making it optimal for high-reliability, mixed-voltage I²C systems where bus stability and safety certification are non-negotiable.

Availability

MAX14933AWE+ is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and instrumentation requiring stable component supply with guaranteed -40°C to +125°C operation and long-term lifecycle support.

Supply support for MAX14933AWE+ 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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets with emphasis on reliability and integration.

The MAX14933 product line delivers certified galvanic isolation for digital interfaces-specifically engineered for robust, latch-up–free I²C/SMBus communication across high-voltage boundaries in harsh environments.

FAQ

What is the maximum continuous working voltage supported by the MAX14933AWE+?

The MAX14933AWE+ supports a maximum continuous working isolation voltage (VIOWM) of 443VRMS, validated per IEC 60747-5-5. This rating applies to steady-state AC or DC conditions across the isolation barrier and is certified under UL1577, VDE 0884-11, and IEC 61010-1 standards-ensuring safe long-term operation in industrial power and battery systems.

Does the MAX14933AWE+ support I²C clock stretching?

Yes, the MAX14933AWE+ fully supports I²C clock stretching. Its bidirectional open-drain architecture and propagation delay matching (tPLHAB/tPHLAB ≤ 110ns over temperature) preserve timing integrity during slave-initiated clock hold events. The device operates from DC to 1.7MHz, accommodating standard (100kHz), fast (400kHz), and fast-plus (1MHz) I²C modes with stretching.

How does the A-side logic-low regulation prevent latch-up in the MAX14933AWE+?

The MAX14933AWE+ A-side outputs regulate logic-low voltage to ≤0.9V, while its input logic-low threshold is set ≥50mV lower (≤0.85V). This intentional margin ensures an A-side output low cannot be misinterpreted as a valid input low on the same side-eliminating feedback paths that cause bus latch-up. This design is critical for reliable I²C arbitration in multi-master systems.

What are the thermal derating limits for the MAX14933AWE+ in its wide SOIC package?

For the MAX14933AWE+ in the 16-pin wide SOIC package, the maximum safety power dissipation is 1760mW at TA = 25°C, derating linearly at 14.1mW/°C above +70°C. At +125°C ambient, the safe power limit drops to ~970mW. Junction temperature must not exceed +150°C, calculated as TJ = TA + (PD × θJA), where θJA = 71°C/W per JEDEC JESD51-7.

Can the MAX14933AWE+ operate with mismatched supply voltages on Side A and Side B?

Yes, the MAX14933AWE+ supports independent supply voltages from 2.25V to 5.5V on VDDA and VDDB-enabling mixed-voltage operation such as 3.3V MCU (Side A) interfacing to 5V sensor bus (Side B). No power sequencing is required; either supply may power up/down independently without affecting isolation integrity or output state.