ADM2491EBRWZ

Overview

The ADM2491EBRWZ is a high-speed, ESD-protected, half- or full-duplex iCoupler isolated RS-485 transceiver manufactured by Analog Devices Inc. It integrates a three-channel isolator with a differential line driver and receiver in a single package. The device supports data rates up to 16 Mbps and provides galvanic isolation with an insulation voltage of 5000 Vrms. It features ±8 kV ESD protection on the RS-485 I/O pins and complies with ANSI TIA/EIA RS-485-A-1998 standards. The logic side operates on 3 V or 5 V supplies, while the bus side requires an isolated 5 V supply. It is housed in a 16-lead wide body SOIC package.

Feature Summary

• Integrates a three-channel digital isolator with RS-485 transceiver functionality using iCoupler magnetic coupling technology
• Provides ±8 kV electrostatic discharge protection on RS-485 input and output pins
• Includes current-limiting and thermal shutdown features to protect against output short circuits and excessive power dissipation

Applications

• Multipoint transmission lines requiring high-speed communication
• Industrial automation systems utilizing balanced transmission lines
• Process control networks compliant with ISO 8482: 1987(E)

Procurement Notes

Verify the specific suffix RZW against official Analog Devices documentation to confirm package dimensions and tape-and-reel specifications if applicable. Confirm RoHS compliance status for the exact manufacturing lot. Ensure the design accommodates the required isolated 5 V supply for the bus side, as the device does not include an integrated isolated power converter. Validate that the 16-SOIC footprint matches the PCB layout requirements.

Selection Notes

Select this component when designing systems requiring galvanic isolation between logic and bus domains for RS-485 networks. It is suitable for applications needing high common-mode transient immunity and robust ESD protection. Consider the dual-supply requirement, as the bus side necessitates an external isolated 5 V source. Evaluate the 16-lead SOIC package constraints against available board space and thermal management needs.

Part Context

This part belongs to the ADM2491E series of isolated transceivers from Analog Devices. It utilizes iCoupler technology to combine isolation and signal conditioning functions. The series is designed for robust communication in electrically noisy environments. The WZ suffix typically denotes a specific reel-based packaging option within the manufacturer's standard product lineup.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the available documentation.