ADM3251EARWZ

Overview

The ADM3251EARWZ is a high-speed, fully isolated single-channel RS-232 transceiver from Analog Devices Inc. It operates from a single 5 V power supply and integrates an IsoPower isolation DC/DC converter for both data and power isolation. The device provides 2.5 kVrms isolation voltage with a common-mode transient immunity of 25 kV/µs. It supports data rates up to 460 Kbps and features ESD protection on input and output pins. Packaged in a 20-SOIC (0.295 inch width) surface-mount package, it functions within a temperature range of -40°C to 85°C.

Feature Summary

• Integrates an isolated DC/DC converter to provide galvanic isolation for both power and signal channels without external magnetics.
• Provides robust electromagnetic interference rejection through high common-mode transient immunity capabilities.
• Includes built-in electrostatic discharge protection on transmitter and receiver I/O pins for enhanced reliability.
• Complies with EIA/TIA-232-E specifications for standard RS-232 communication interfaces.

Applications

• Industrial communication systems requiring galvanic isolation
• Medical equipment diagnostic ports
• General-purpose RS-232 data links in noisy environments

Procurement Notes

Verify the specific suffix 'EARWZ' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Ensure the procurement channel provides original manufacturer documentation. Check for any recent lifecycle notices or obsolescence warnings directly from Analog Devices before finalizing orders.

Selection Notes

Select this component when a single-channel RS-232 interface requires integrated power isolation to simplify board layout. It is suitable for applications needing high noise immunity and compact surface-mount packaging. Consider the 20-pin SOIC footprint constraints and verify that the 460 Kbps speed meets system requirements.

Part Context

This part belongs to the ADM3251E family of isolated RS-232 transceivers. It utilizes iCoupler technology for signal isolation and IsoPower for integrated power conversion. The series is designed to replace traditional transformer-based isolation solutions in serial communication applications.

Replacement Considerations

Check Analog Devices documentation for direct pin-compatible alternatives within the ADM3251 series. Verify if other variants offer different isolation voltages or package options while maintaining the same functional interface.

FAQ

Does the ADM3251EARWZ require external capacitors for the isolation barrier?

No, the device integrates an IsoPower DC/DC converter, eliminating the need for external charge pump capacitors or transformers across the isolation barrier.

What is the maximum data rate supported by this transceiver?

The ADM3251EARWZ supports data rates up to 460 Kbps.