Analog Devices Inc./Maxim Integrated MAX14933AWE+T

Overview

MAX14933AWE+T from Maxim Integrated is a two-channel, 2.75kVRMS galvanic isolator optimized for I2C/SMBus/PMbus interfaces in isolated power supplies and battery management systems. It features bidirectional open-drain channels, independent 2.25V–5.5V dual-supply operation, DC–1.7MHz data rate, and operates across –40°C to +125°C ambient temperature.

For engineers reviewing the MAX14933AWE+T datasheet, MAX14933AWE+T pinout, MAX14933AWE+T application, or MAX14933AWE+T equivalent, this page delivers verified isolation voltage ratings (2.75kVRMS/443VRMS/630VPK), side-specific logic-low regulation (0.9V max on A-side), CMTI of 25kV/µs, and package-specific creepage (8mm) and thermal resistance (θJA = 71°C/W).

Technical Context

The MAX14933AWE+T implements proprietary BiCMOS-based capacitive isolation with two independent bidirectional channels-each with A-side regulated low-voltage outputs (≤0.9V) and B-side conventional buffers. Its architecture eliminates direction-control pins and supports clock stretching while preventing bus latch-up via ≥50mV input/output logic-low threshold margin.

It achieves 25kV/µs common-mode transient immunity and guarantees propagation delays ≤115ns (A→B high-to-low) and ≤125ns (B→A high-to-low) across full voltage (2.25–5.5V) and temperature (–40°C to +125°C) ranges, with pulse-width distortion under 100ns at 2.25V supply.

Key Specifications

Pinout & Package

The MAX14933AWE+T is housed in a 16-pin wide-body SOIC package (10.3mm × 7.5mm) with 8mm creepage and clearance, rated for –40°C to +125°C operation and RoHS-compliant (lead-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM1250ARZ and SI8602ED-B-IS, the MAX14933AWE+T uniquely combines 2.75kVRMS isolation, native bidirectional I2C support with clock stretching, and A-side latch-up prevention - making it optimal for certified industrial power and battery systems where safety and protocol fidelity are non-negotiable.

Availability

MAX14933AWE+T is available at Aetrix Electronics and suitable for isolated I2C interfaces in power supplies, battery management systems, and industrial instrumentation requiring stable component supply across extended temperature and safety-critical operating conditions.

Supply support for MAX14933AWE+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 high-performance analog and mixed-signal ICs for precision, power, and interface applications in industrial, automotive, and communications markets.

The MAX14933 product line delivers certified galvanic isolation for digital buses, specifically engineered for robust I2C/SMBus/PMbus signal transfer in harsh environments where high working voltage, wide temperature range, and safety certification are mandatory.

FAQ

What isolation certifications does the MAX14933AWE+T hold?

The MAX14933AWE+T is certified to UL1577 (3750VRMS), cUL (CSA 5A), VDE 0884-11 (Basic Insulation), and TUV standards. It supports 2.75kVRMS withstand voltage for 60 seconds, 443VRMS continuous working voltage (VIOWM), and 630VPK repetitive peak voltage - meeting IEC 61010-1 and IEC 61000-4-5 surge requirements. These certifications apply specifically to the MAX14933AWE+T wide SOIC package.

Does the MAX14933AWE+T support I2C clock stretching?

Yes, the MAX14933AWE+T fully supports I2C clock stretching. Its bidirectional open-drain architecture allows either side to hold the SCL line low without direction control, preserving native I2C timing behavior. This capability is validated across its full operating range (–40°C to +125°C, 2.25V–5.5V supplies) and is explicitly confirmed in the MAX14933AWE+T datasheet's Detailed Description section.

What is the purpose of the regulated logic-low voltage on the A-side outputs of the MAX14933AWE+T?

The A-side outputs (I/OA1, I/OA2) of the MAX14933AWE+T regulate logic-low voltage to ≤0.9V with ≥50mV margin below the input low threshold - preventing bus latch-up when multiple open-drain devices share the same I2C line. This design ensures that an A-side output low cannot be misinterpreted as a valid input low by another A-side device, eliminating false feedback loops. The MAX14933AWE+T implements this regulation inherently; no external components are required.

Can the MAX14933AWE+T be used with different supply voltages on each side?

Yes, the MAX14933AWE+T supports independent supply voltages: VDDA (2.25V–5.5V relative to GNDA) and VDDB (2.25V–5.5V relative to GNDB). This enables level translation between, for example, a 3.3V microcontroller (side A) and a 5V PMBus power controller (side B). The MAX14933AWE+T requires no power sequencing - either supply may power up/down independently without disrupting isolation integrity or causing undefined states.

What are the thermal limitations of the MAX14933AWE+T in its wide SOIC package?

The MAX14933AWE+T in the W16M+8 wide SOIC package has a junction-to-ambient thermal resistance (θJA) of 71°C/W on a four-layer board. Its maximum junction temperature is +150°C, and total safety power dissipation is limited to 1760mW at +25°C ambient. Derating begins above +70°C at 14.1mW/°C. These values are measured per JEDEC JESD51-7 and are specific to the MAX14933AWE+T package configuration.