Analog Devices Inc./Maxim Integrated ADUM1252AWA+

Overview

ADUM1252AWA+ from Analog Devices is an ultra-low-power, bidirectional I²C isolator with two open-drain isolated channels, 1.71V–5.5V dual-supply operation per side, 2MHz SCL support, and idle-bus hot-swap capability on Side 2. It enables robust galvanic isolation in battery-powered I²C systems such as BMS and PoE interfaces.

For engineers reviewing the ADUM1252AWA+ datasheet, ADUM1252AWA+ pinout, ADUM1252AWA+ application, or ADUM1252AWA+ equivalent, key selection factors include its 0.69V/0.4V VOL(max) per side, 21µA standby current per side, reinforced isolation up to 848 VRMS (wide SOIC), and guaranteed hot-swap behavior during bus idle or STOP condition detection.

Technical Context

The ADUM1252AWA+ implements asymmetric buffer architecture: Side 1 uses regulated low-voltage output buffers (VOL1 = 0.64V typ) with 50mV input hysteresis to prevent latch-up, while Side 2 uses conventional CMOS buffers with higher sink strength (50mA). Its hot-swap logic precharges SDA2/SCL2, monitors for idle or STOP states, then connects only after safe bus conditions are confirmed.

It supports clock stretching and multi-controller topologies across the isolation barrier, maintains bidirectional SCL functionality, and delivers CMTI ≥200 kV/µs. The device operates across –40°C to +125°C ambient and withstands ±10kV surge per IEC 61000-4-5.

Key Specifications

Pinout & Package

The ADUM1252AWA+ is supplied in an 8-pin wide-body SOIC package (Outline 21-100415) with creepage/clearance of 8 mm, rated for 848 VRMS working voltage and 5000 VRMS withstand voltage.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional I²C isolator applications.

Compared with ADUM1252AWA+, ADUM1250ARZ offers lower isolation rating and no hot-swap, making it suitable only for static connections; SI8602ED-B-IS trades speed and VOL performance for lower cost in non-critical timing applications.

Availability

ADUM1252AWA+ is available at Aetrix Electronics and suitable for battery management systems, Power over Ethernet interfaces, and motor control feedback loops requiring stable component supply, long-term lifecycle assurance, and certified reinforced isolation.

Supply support for ADUM1252AWA+ 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, serving precision instrumentation, industrial automation, and communications markets.

The ADuM1252 product line delivers ultra-low-power, hot-swappable I²C isolation for safety-critical and energy-constrained systems-designed specifically for BMS, PoE, and isolated sensor interfaces demanding robustness and interoperability.

FAQ

What is the maximum SCL frequency supported by the ADUM1252AWA+?

The ADUM1252AWA+ supports bidirectional I²C data transfer up to 2 MHz SCL frequency. This is validated across the full operating temperature range (–40°C to +125°C) and supply range (1.71V–5.5V per side), enabling full-speed Fast Mode Plus I²C operation without protocol violation or timing failure.

Does the ADUM1252AWA+ support clock stretching across the isolation barrier?

Yes, the ADUM1252AWA+ fully supports clock stretching in both directions. Its bidirectional SCL architecture and internal state machine preserve the timing relationship between master and slave, allowing any side to hold SCL low to extend the clock cycle-critical for multi-controller and sensor-based I²C systems.

What isolation rating does the ADUM1252AWA+ achieve in its wide-body SOIC package?

The ADUM1252AWA+ in the wide-body SOIC package achieves 848 VRMS maximum working isolation voltage (VIOWM), 5000 VRMS withstand voltage (VISO), and 1200 VPEAK reinforced repetitive peak isolation voltage (VIORM), meeting IEC 60747-17 and pending UL 1577, CSA C22.2 No. 14-18, and IEC/EN/CSA 62368-1 certifications.

How does the hot-swap feature of the ADUM1252AWA+ prevent data corruption on Side 2?

The ADUM1252AWA+ prevents data corruption by first precharging SDA2/SCL2 pins to 0.3×VDD2, then monitoring bus state for either an idle condition (both lines high) or a valid STOP condition before connecting Side 1 and Side 2. This sequence ensures no spurious transitions occur during live insertion.

Can the ADUM1252AWA+ operate with different supply voltages on Side 1 and Side 2?

Yes, the ADUM1252AWA+ supports independent 1.71V to 5.5V supplies on Side 1 (VDD1) and Side 2 (VDD2), enabling seamless level shifting between domains-for example, 1.8V MCU on Side 1 and 3.3V sensor on Side 2-without external level translators or voltage dividers.