Analog Devices Inc./Maxim Integrated MAX22445RAWE+

Overview

MAX22445RAWE+ from Analog Devices is a reinforced 4-channel digital galvanic isolator with unidirectional channel configuration, 200Mbps maximum data rate, 5kVRMS withstand voltage (60s), and active-low output enable on Side A. It enables isolated SPI bus port sharing by allowing the CS signal to directly control MISO output enable, operating across 1.71V–5.5V dual supplies and rated for -40°C to +125°C ambient.

For engineers reviewing the MAX22445RAWE+ datasheet, MAX22445RAWE+ pinout, MAX22445RAWE+ application, or MAX22445RAWE+ equivalent, this device is selected for high-speed industrial fieldbus isolation, battery management system signal integrity, and medical equipment safety-critical digital interface separation where CMTI >50kV/μs and reinforced VDE 0884-11 compliance are mandatory.

Technical Context

The MAX22445RAWE+ implements Maxim's proprietary silicon-based reinforced isolation barrier with 8mm creepage/clearance in a wide-body SOIC package. Its architecture supports independent 1.71V–5.5V supplies on both sides, enabling level translation between disparate logic domains while maintaining 1500VRMS continuous working voltage and ±12.8kV surge immunity (1.2/50μs).

This variant features active-low ENA on Side A, default-low outputs, and 200Mbps operation-distinguishing it from 25Mbps and active-high enable variants in the MAX22444–MAX22446 family. All four channels are unidirectional, with no internal bidirectional logic or auto-direction control.

Key Specifications

Pinout & Package

MAX22445RAWE+ uses a 16-pin wide-body SOIC package (W16MS+12, 8mm creepage/clearance, CTI ≥400, Group II material) with exposed inner lead frame for thermal performance and reinforced isolation integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISO6741RWER and ADUM2401ARWZ, MAX22445RAWE+ delivers 4× higher data rate than the latter and 4× faster operation than the former, while its active-low ENA and default-low outputs provide deterministic SPI bus sharing and fail-safe behavior unavailable in either alternative.

Availability

MAX22445RAWE+ is available at Aetrix Electronics and suitable for industrial fieldbus communications, battery management systems, and medical diagnostic equipment requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.

Supply support for MAX22445RAWE+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX22444–MAX22446 family was designed specifically for high-speed, low-power, reinforced digital isolation in safety-critical industrial, medical, and energy systems where traditional optocouplers fall short in speed, power, and lifetime reliability.

FAQ

What is the maximum data rate supported by MAX22445RAWE+?

The MAX22445RAWE+ supports a maximum data rate of 200Mbps at supply voltages ≥2.25V. At lower supplies (1.71V–2.25V), the guaranteed maximum drops to 150Mbps. This enables high-speed SPI, RS-422, and digital I/O isolation where timing margins are critical. The MAX22445RAWE+ achieves this with <10ns propagation delay and 100ps peak eye diagram jitter.

Does MAX22445RAWE+ support different supply voltages on each side?

Yes, MAX22445RAWE+ supports independent 1.71V–5.5V supplies on Side A (VDDA/GNDA) and Side B (VDDB/GNDB). This allows seamless level translation between 1.8V microcontrollers and 3.3V or 5V isolated peripherals without external translators - a key enabler for mixed-voltage system architectures.

What is the function of the ENA pin on MAX22445RAWE+?

The ENA pin on MAX22445RAWE+ is an active-low enable for all four Side A outputs (OUT1–OUT4). When ENA is low, outputs drive their logic states; when high, outputs enter high-impedance. This feature allows direct connection to a microcontroller's chip-select (CS) signal to isolate MISO on shared SPI buses - a core design advantage of the MAX22445RAWE+.

What safety certifications does MAX22445RAWE+ hold?

MAX22445RAWE+ is certified to UL 1577 (5000VRMS), cUL CSA 5A (5000VRMS), and VDE 0884-11:2017-1 for reinforced isolation. It meets 1500VRMS working voltage (VIOWM), 8000VPK surge rating, and 5kVRMS withstand (60s), making it suitable for 2×MOPP medical and industrial safety applications per IEC 62368-1 and IEC 61000-4-5.

How does the default-low output behavior benefit system design?

The default-low output state of MAX22445RAWE+ ensures that OUT1–OUT4 drive logic low when unpowered, during brown-out, or if inputs float - eliminating undefined states and preventing spurious signals in safety-critical paths. This fail-safe behavior simplifies power sequencing and reduces need for external pull-down resistors in battery management and medical systems.