Analog Devices Inc./Maxim Integrated MAX14933ASE+T

Overview

The MAX14933ASE+T from Maxim Integrated is a two-channel, 2.75kVRMS galvanic isolator designed for bidirectional I2C/SMBus signal isolation across isolated power domains. It supports DC to 1.7MHz data rates, operates from 2.25V to 5.5V on both sides, and delivers guaranteed logic-low regulation (≤900mV at 3mA) on Side A with 50mV input/output low-voltage margin to prevent bus latch-up. It is deployed in battery management systems where high-voltage isolation and clock-stretching compatibility are required.

For engineers reviewing the MAX14933ASE+T datasheet, MAX14933ASE+T pinout, MAX14933ASE+T application, or MAX14933ASE+T equivalent, this page provides verified technical context, validated pin functions, real-world I2C isolation use cases, and confirmed alternative options - all grounded in Maxim's official specifications and safety certifications.

Technical Context

The MAX14933ASE+T implements dual open-drain, bidirectional isolation channels using Maxim's proprietary BiCMOS process, enabling transparent I2C communication without direction control pins. Its A-side outputs feature regulated logic-low voltage (≤900mV) with input threshold ≥50mV lower to eliminate feedback-induced latch-up, while B-side outputs use conventional buffers with ≤400mV VOL at 30mA sink.

It supports independent supply rails (2.25V–5.5V per side), withstands ±10kV surge per IEC 61000-4-5, and maintains operation up to +125°C ambient. Common-mode transient immunity is rated at 25kV/µs, and propagation delay ranges from 20ns to 125ns depending on voltage and direction - critical for timing-sensitive isolated sensor interfaces.

Key Specifications

Pinout & Package

MAX14933ASE+T is housed in a RoHS-compliant 16-pin narrow-body SOIC package (S16M+11), with 4mm minimum creepage and clearance, optimized for compact industrial and battery-management PCBs.

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 MAX14933ASE+T uniquely combines A-side logic-low regulation, 1.7MHz bandwidth, and 2.25–5.5V dual-supply flexibility - making it the only option among the three qualified for robust, mixed-voltage I2C isolation in safety-critical battery and power systems.

Availability

MAX14933ASE+T is available at Aetrix Electronics and suitable for battery management systems, industrial power supplies, isolated instrumentation, and medical-grade PMBus interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MAX14933ASE+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 demanding industrial, automotive, and computing applications.

The MAX14933ASE+T belongs to Maxim's digital isolator product line, engineered specifically for robust, low-latency I2C/SMBus isolation in harsh environments where galvanic separation, safety certification, and timing fidelity are non-negotiable.

FAQ

What is the maximum operating temperature for the MAX14933ASE+T?

The MAX14933ASE+T is rated for continuous operation from -40°C to +125°C ambient temperature, with a maximum junction temperature of +150°C. This rating is validated across all electrical parameters in the datasheet and supports deployment in high-temperature battery enclosures and industrial control cabinets where thermal management is constrained.

Does the MAX14933ASE+T support I2C clock stretching?

Yes, the MAX14933ASE+T fully supports I2C clock stretching due to its bidirectional, open-drain channel architecture and propagation delay characteristics (20–125ns). The device maintains signal integrity during extended low periods on SCL, enabling slave devices like ADCs or battery monitors to hold the clock line without timing violation or latch-up.

What is the purpose of the regulated logic-low voltage on the A-side of the MAX14933ASE+T?

The regulated logic-low voltage (≤900mV at 3mA) on I/OA1 and I/OA2, combined with an input threshold ≥50mV lower, prevents the MAX14933ASE+T from latching the I2C bus during bidirectional arbitration. This ensures that a low output on Side A is never misinterpreted as a valid input low on the same side - a critical safeguard in multi-master I2C systems.

Can the MAX14933ASE+T be used with different supply voltages on each side?

Yes, the MAX14933ASE+T supports independent supply rails: VDDA and VDDB each operate from 2.25V to 5.5V. This allows direct interfacing between 3.3V microcontrollers (Side A) and 5V peripherals (Side B) without external level shifters - a key advantage in mixed-voltage industrial and automotive subsystems.

What safety certifications does the MAX14933ASE+T hold?

The MAX14933ASE+T is certified to UL1577 (3750VRMS), cUL (CSA Bulletin 5A), VDE 0884-11 (basic insulation), and IEC 61000-4-5 (±10kV surge). It meets 443VRMS working voltage (VIOWM) and 630VPK repetitive peak voltage (VIORM), satisfying requirements for industrial and medical equipment under IEC 61010-1 and IEC 60601-1.