Analog Devices Inc./Maxim Integrated MAX14935BAWE+T

Overview

MAX14935BAWE+T from Maxim Integrated is a four-channel, 5kVRMS galvanic digital isolator with unidirectional channel configuration (3 inputs on Side A → 3 outputs on Side B + 1 enable-controlled bidirectional pair), 25Mbps data rate, and 1.71V–5.5V dual-supply operation across isolated domains. It enables robust SPI/RS-232/RS-485 isolation in industrial fieldbus and battery management systems operating up to +125°C.

For engineers reviewing the MAX14935BAWE+T datasheet, MAX14935BAWE+T pinout, MAX14935BAWE+T application, or MAX14935BAWE+T equivalent, key selection criteria include its 25Mbps timing performance, ±25kV/µs CMTI, default-low output state, wide SOIC-16 package, and compliance with UL1577, VDE 0884-11 Basic Insulation, and IEC 61000-4-5 surge standards.

Technical Context

The MAX14935BAWE+T implements capacitive isolation with proprietary silicon-dioxide barrier technology, supporting asymmetric supply voltages (e.g., 1.8V Side A / 3.3V Side B) and level translation. Its channel architecture features three dedicated A→B unidirectional channels plus one ENA/ENB-controlled bidirectional pair (INA3/OUTA1 ↔ INB1/OUTB3), enabling flexible SPI slave isolation.

It uses active-hysteresis input receivers (410mV typical hysteresis) and push-pull CMOS outputs with 0.4V VOL / (VDD − 0.4V) VOH drive strength. Undervoltage lockout (1.45V–1.71V threshold) ensures reliable power-on reset behavior across temperature (−40°C to +125°C).

Key Specifications

Pinout & Package

Package: 16-pin wide-body SOIC (W16M+8), outline 21-0042, creepage/clearance ≥8mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM140D0BRZ and SI8642ED-B-IS, the MAX14935BAWE+T uniquely combines 5kVRMS isolation, VDE-certified basic insulation, integrated bidirectional control, and default-low output state - making it optimal for safety-critical SPI isolation where surge immunity and deterministic low-state startup are mandatory.

Availability

MAX14935BAWE+T is available at Aetrix Electronics and suitable for industrial fieldbus communications, isolated SPI interfaces, battery management systems, and isolated digital I/O expansion requiring stable component supply and long-term lifecycle support.

Supply support for MAX14935BAWE+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 precision analog, mixed-signal, and high-reliability interface ICs for industrial, automotive, and medical applications.

The MAX14934–MAX14936 family was engineered specifically for high-noise industrial environments requiring certified 5kVRMS galvanic isolation, wide supply range, and flexible channel directionality - targeting fieldbus, motor control, and energy infrastructure systems.

FAQ

What is the isolation voltage rating of the MAX14935BAWE+T?

The MAX14935BAWE+T is rated for 5kVRMS withstand voltage for 60 seconds (VISO), 848VRMS continuous working voltage (VIOWM), and ±10kV surge per IEC 61000-4-5. It is certified to UL1577, CSA Bulletin 5A, and VDE 0884-11 Basic Insulation - making it suitable for reinforced insulation applications in industrial and medical systems where the MAX14935BAWE+T provides certified safety margins.

Does the MAX14935BAWE+T support bidirectional communication?

Yes, the MAX14935BAWE+T supports one bidirectional channel pair (INA3/OUTA1 ↔ INB1/OUTB3) controlled by independent ENA and ENB enable inputs. The remaining three channels are unidirectional (A→B). This architecture allows full-duplex SPI clock isolation while maintaining dedicated data/control paths - a key differentiator of the MAX14935BAWE+T within the MAX14934–MAX14936 family.

What is the default output state of the MAX14935BAWE+T when inputs are unpowered?

The MAX14935BAWE+T has a default-low output configuration: when any input is unpowered or floating, the corresponding output drives low. This behavior is confirmed by the "B" suffix in the part number and is critical for fail-safe operation in systems where inactive states must assert logic low - such as disabling gate drivers or deactivating relays in the MAX14935BAWE+T's target applications.

Can the MAX14935BAWE+T operate with different supply voltages on each side?

Yes, the MAX14935BAWE+T supports independent 1.71V–5.5V supplies on Side A (VDDA/GNDA) and Side B (VDDB/GNDB). This enables direct interfacing between 1.8V FPGAs and 5V field-side peripherals without external level shifters - a core design feature of the MAX14935BAWE+T that simplifies mixed-voltage system architecture and reduces component count.

What safety certifications does the MAX14935BAWE+T hold?

The MAX14935BAWE+T holds UL1577 (File E351759), cUL (CSA Bulletin 5A), VDE 0884-11 Basic Insulation (File 5015017-4880-0001), and TUV certification to IEC 60950-1 and IEC 61010-1. These approvals validate its 5kVRMS isolation barrier for single-protection applications - confirming that the MAX14935BAWE+T meets global regulatory requirements for industrial and medical equipment safety compliance.