Analog Devices Inc. ADUM2281BRIZ

Overview

ADuM2281BRIZ from Analog Devices is a 5 kVRMS dual-channel digital isolator using iCoupler® transformer-based technology, providing bidirectional signal isolation between two independent circuits. It supports up to 100 Mbps data rate, features 24 ns maximum propagation delay, 3 V to 5.5 V supply range per side, and default-high output logic state on both channels - enabling robust RS-485 transceiver isolation in industrial power supplies.

For engineers reviewing the ADuM2281BRIZ datasheet, ADuM2281BRIZ pinout, ADuM2281BRIZ application, or ADuM2281BRIZ equivalent, key selection criteria include reinforced 5000 VRMS isolation rating, high common-mode transient immunity (>25 kV/μs), C-grade timing performance, SOIC-16WB package with 8.7 mm creepage, and compatibility with 3 V/5 V level translation across the barrier.

Technical Context

The ADuM2281BRIZ implements monolithic air-core transformers for galvanic isolation, eliminating LED aging and timing drift inherent in optocouplers. Its patented refresh circuit ensures DC-correct output behavior during input signal inactivity or power-up sequencing.

It operates with independent 3.0–5.5 V supplies on each side, supporting mixed-voltage interfaces (e.g., 5 V MCU side to 3.3 V sensor side). Channel-to-channel matching is ≤5 ns (C grade), and pulse width distortion remains ≤2 ns, making it suitable for precise timing-critical isolation in motor control feedback loops and isolated ADC/DAC interfaces.

Key Specifications

Pinout & Package

ADuM2281BRIZ uses a 16-lead SOIC wide-body package with enhanced creepage (8.7 mm), rated for 5000 VRMS isolation. Pin 1–8 form Side 1 (input side); Pins 9–16 form Side 2 (output side). Ground pins are duplicated for low-inductance return paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADuM2281ARIZ and SI8621ED-B-IS, ADuM2281BRIZ uniquely balances 100 Mbps capability, 24 ns timing, SOIC-16 pin compatibility with ADuM220x/221x families, and full regulatory coverage for medical and industrial safety standards - making it optimal for new designs requiring proven reliability and minimal layout change.

Availability

ADuM2281BRIZ is available at Aetrix Electronics and suitable for industrial motor drives, isolated communications infrastructure, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for ADuM2281BRIZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and healthcare markets.

The ADuM228x family was designed specifically for high-reliability, high-speed digital isolation in safety-critical systems - emphasizing low latency, DC correctness, and comprehensive regulatory certification across medical, industrial, and energy sectors.

FAQ

What is the maximum data rate supported by ADuM2281BRIZ?

ADuM2281BRIZ supports up to 100 Mbps data rate under C-grade specifications (TA = −40°C to +125°C, VDD = 5 V). This is validated with CL = 15 pF load and CMOS-level signals. At lower speeds (e.g., 25 Mbps), it operates across A/B/C grades; the 100 Mbps rating applies exclusively to C-grade units like ADuM2281BRIZ, ensuring timing compliance in high-throughput isolated serial links.

Does ADuM2281BRIZ support level translation between different supply voltages?

Yes, ADuM2281BRIZ supports true bidirectional level translation: VDD1 and VDD2 can operate independently at 3.0–5.5 V, enabling configurations such as 5 V MCU ↔ 3.3 V FPGA or 3.3 V sensor ↔ 5 V actuator. Input thresholds scale with respective VDD (VIH = 0.7×VDDx), and output drive levels follow VDD2 - all without external components.

What safety certifications apply to ADuM2281BRIZ?

ADuM2281BRIZ carries UL 1577 (5000 VRMS), VDE 0884-17 (reinforced, 645 VPEAK), IEC/CSA 62368-1, IEC/CSA 61010-1, and IEC/CSA 60601-1 (2 MOPP) certifications. These validate its suitability for industrial control, test equipment, and patient-connected medical devices where reinforced isolation and double protection are mandated.

How does the refresh feature in ADuM2281BRIZ ensure DC correctness?

ADuM2281BRIZ incorporates a patented internal refresh circuit that periodically samples and retransmits the last valid input state across the isolation barrier - even when inputs are static. With a 1.6 µs refresh period, it guarantees output stability during idle periods or slow-changing control signals, eliminating the DC drift seen in optocouplers and capacitive isolators without active refresh.

Is ADuM2281BRIZ pin-compatible with other Analog Devices isolator families?

Yes, ADuM2281BRIZ is pin-compatible with the ADuM2201 and ADuM2211 families in the same SOIC-16WB package. This allows direct replacement in existing layouts for upgraded performance - e.g., migrating from ADuM2201AR to ADuM2281BRIZ gains 100 Mbps capability, tighter timing (24 ns vs. 50 ns), and enhanced CMTI (>25 kV/μs vs. 25 kV/μs typical).