LTM2881HY-3

Overview

The LTM2881HY-3 is a complete isolated RS485/RS422 transceiver module manufactured by Analog Devices Inc. It integrates magnetic coupling technology to provide galvanic isolation without external components. The device supports 3.3V operation and includes an integrated selectable 120 ohm termination resistor. It features an isolated DC power supply capable of delivering 5V at up to 200mA. The module is designed for robust communication in electrically noisy environments, combining high-speed data transmission with comprehensive protection features within a single package.

Feature Summary

• Integrates magnetic coupling technology for complete signal and power isolation
• Includes an internally selectable 120 ohm bus termination resistor
• Provides an isolated 5V DC power output with up to 200mA capability
• Operates on a single 3.3V supply voltage without requiring external isolation components

Applications

• Industrial automation control systems
• Factory floor sensor networks
• Building automation and HVAC monitoring
• Medical equipment communication interfaces

Procurement Notes

Verify the specific suffix 'HY-3' against official Analog Devices documentation to confirm pinout and thermal characteristics. Ensure compatibility with the target PCB footprint, as the module utilizes a specific surface-mount package. Confirm that the required isolation voltage ratings meet the safety standards of the end application before finalizing procurement.

Selection Notes

Select this component when a compact, fully integrated isolated interface is required without the complexity of discrete isolators and transformers. It is suitable for designs needing both data isolation and isolated power delivery from a single source. Consider the 200mA isolated power limit when sizing downstream loads. Verify that the 3.3V logic level matches the host microcontroller or processor interface requirements.

Part Context

This part belongs to the LTM2881 series of low EMI isolated transceivers. It represents a modular solution designed to simplify the design-in process for RS485 and RS422 applications. The series emphasizes reduced electromagnetic interference and simplified bill of materials by integrating passive components typically required for isolation barriers into the module itself.

Replacement Considerations

Consult Analog Devices official cross-reference lists for verified substitutes. Generic RS485 transceivers lack the integrated isolation and power conversion capabilities, making them unsuitable direct replacements without significant circuit redesign.