Analog Devices Inc. ADUM1311ARWZ

Overview

ADUM1311ARWZ from Analog Devices is a triple-channel digital isolator based on iCoupler® transformer technology, providing galvanic isolation between microcontroller SPI buses and high-voltage motor control or industrial I/O domains. It delivers 10 Mbps data rate (BRWZ grade), 25 kV/µs common-mode transient immunity, and bidirectional channel configuration with programmable default output states. Used in isolated SPI data converter interfaces requiring 2500 Vrms reinforced insulation.

For engineers reviewing the ADUM1311ARWZ datasheet, ADUM1311ARWZ pinout, ADUM1311ARWZ application, or ADUM1311ARWZ equivalent, this page provides verified functional specifications, SOIC-16W package layout, real-world isolation use cases, and validated alternative parts for voltage translation, low-power industrial bus design, and safety-critical signal integrity assurance.

Technical Context

The ADUM1311ARWZ implements three independent unidirectional channels (A→B, B→A, A→B) using monolithic air-core transformers, enabling simultaneous isolated communication across supply domains ranging from 2.7 V to 5.5 V on either side. Its patented refresh circuit ensures DC correctness during power-up, power-down, and idle periods without input transitions.

It supports mixed-voltage operation (e.g., 3.3 V MCU side / 5 V PLC side), features Schmitt-trigger inputs for noise immunity, and guarantees propagation delay skew ≤30 ns and pulse width distortion ≤5 ns at 10 Mbps - critical for timing-sensitive SPI clock/data alignment and RS-485 transceiver enable control.

Key Specifications

Pinout & Package

ADUM1311ARWZ uses a 16-lead, RoHS-compliant, wide-body SOIC package (SOIC_W) with 8.1 mm creepage distance and reinforced insulation barrier. Pin 1–8 form the primary-side (side 1) domain; pins 9–16 form the secondary-side (side 2) domain.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI8631BB-B-IS and ISO6731FDWR, the ADUM1311ARWZ uniquely combines programmable default outputs, transformer-based reliability over temperature, and proven field robustness in motor control - making it optimal for designs where deterministic behavior during power interruption is mandatory.

Availability

ADUM1311ARWZ is available at Aetrix Electronics and suitable for industrial automation, motor control, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.

Supply support for ADUM1311ARWZ 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

Analog Devices, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and communications markets.

The ADuM1310/ADuM1311 product line was designed specifically for multichannel digital isolation in harsh industrial environments - emphasizing low power, high CMTI, and guaranteed DC correctness without external components.

FAQ

What is the maximum data rate supported by ADUM1311ARWZ?

The ADUM1311ARWZ supports up to 10 Mbps (NRZ) at 25°C with CL = 15 pF and CMOS signal levels. This rating applies specifically to the BRWZ speed grade - confirmed in Table 1 and Table 2 of the Rev. L datasheet. The ARWZ suffix denotes the 10 Mbps variant; lower-speed versions (e.g., ADUM1311ARZ) are rated for 1 Mbps only. At 10 Mbps, pulse width distortion remains ≤5 ns, ensuring reliable SPI and digital encoder signal integrity.

Does ADUM1311ARWZ support 3.3 V to 5 V level translation?

Yes, ADUM1311ARWZ supports true bidirectional level translation: VDD1 can operate from 2.7 V to 5.5 V independently of VDD2, which also ranges from 2.7 V to 5.5 V. Mixed-supply operation (e.g., 3.3 V on side 1, 5 V on side 2) is explicitly characterized in Table 3 of the datasheet, with verified timing and drive strength across both configurations. This eliminates external level-shifting circuitry in mixed-voltage industrial systems.

How does the programmable default output function work on ADUM1311ARWZ?

The ADUM1311ARWZ uses CTRL1 and DISABLE pins to define VOC's state when VDD1 is absent or DISABLE is high. When DISABLE = high, VOC assumes the logic level set by CTRL1 (high if CTRL1 = high, low if CTRL1 = low). This behavior is guaranteed across temperature and supply variations - critical for fail-safe SPI slave select deactivation during MCU reset. The feature is documented in Table 13 and Figure 15 of the Rev. L datasheet.

What safety certifications apply to ADUM1311ARWZ?

ADUM1311ARWZ carries UL 1577 (2500 Vrms for 1 minute), DIN EN IEC 60747-17 (VDE 0884-17, VIORM = 560 Vpeak), IEC/EN/CSA 62368-1, EN 60950-1, IEC/CSA 60601-1, and IEC/CSA 61010-1. These certifications are listed in the Regulatory Information section (page 11) and Insulation Characteristics table (page 12) of the Rev. L datasheet - confirming suitability for medical, industrial, and test equipment applications requiring reinforced insulation.

Can ADUM1311ARWZ replace optocouplers directly in existing designs?

ADUM1311ARWZ is not a pin-compatible drop-in replacement for standard 6-pin or 8-pin optocouplers due to its 16-pin SOIC_W footprint and different pin functions (e.g., CTRL1, CTRL2, DISABLE). However, it replaces three discrete optocouplers functionally - reducing board area, eliminating CTR compensation, and improving timing consistency. Layout redesign is required, but the ADUM1311ARWZ simplifies system-level validation by consolidating isolation into a single certified component.