ADUM2251ARWZ

Overview

The ADuM2251ARWZ is a hot-swappable, dual-channel digital isolator designed for I2C interfaces. It features nonlatching bidirectional communication channels with a data rate of 1 Mbps and a propagation delay of 162 ns. The device supports supply voltages from 3.0 V to 5.5 V and operates within a temperature range of -40°C to +105°C. It provides 5000 Vrms isolation voltage per UL 1577 standards and offers a common-mode transient immunity (CMTI) of 25 kV/µs. Packaged in a 16-lead SOIC wide body enhanced creepage version (RI-16-2), it includes a 30 mA current sink capability suitable for open-drain interfaces.

Feature Summary

• Supports hot-swap applications with nonlatching bidirectional communication channels compatible with I2C interfaces
• Provides high insulation strength with 5000 Vrms isolation voltage and 8.3 mm creepage distance
• Features robust signal integrity with 25 kV/µs common-mode transient immunity

Applications

• Isolated I2C, SMBus, or PMBus interfaces
• Multilevel I2C interfaces
• Power supplies and networking equipment
• Power over Ethernet systems

Procurement Notes

Verify the specific suffix ARWZ to confirm the 16-lead SOIC wide body enhanced creepage package variant. Ensure compatibility with I2C protocol requirements, specifically checking for hot-swap support and bidirectional channel needs. Confirm that the 5000 Vrms isolation rating meets the safety standards required by your target application environment. Cross-reference the RI-16-2 package designation with your PCB footprint specifications to ensure mechanical fit.

Selection Notes

Select this component when designing isolated I2C buses requiring hot-swappable functionality without splitting signals into separate transmit and receive lines. It is suitable for applications needing high common-mode noise rejection and reinforced isolation ratings under IEC 60950-1 or IEC 60601-1 standards. Consider the 162 ns propagation delay and 1 Mbps data rate limits when determining system timing constraints. The wide operating temperature range makes it appropriate for industrial environments.

Part Context

This part belongs to the ADuM225x family of digital isolators from Analog Devices, utilizing proprietary iCoupler technology for magnetic coupling isolation. The series is designed to replace traditional optocouplers by offering smaller size, lower power consumption, and higher reliability. The ADuM2251 variant specifically targets dual-channel I2C isolation needs, providing a compact solution for maintaining signal integrity across galvanic barriers in complex electronic systems.

Replacement Considerations

The ADUM2250ARWZ is a similar dual-channel isolator within the same family; verify if single-directional or specific pinout differences affect your design. Check for updated revisions such as ADUM2251ARWZ-RL which may indicate reel packaging variations but identical electrical characteristics.