IL 3122-3E

Overview

The IL3122-3E is a galvanically isolated, differential bus transceiver designed for bidirectional data communication over balanced transmission lines. It supports RS-422 and RS-485 protocols with a 2500Vrms isolation rating. The device features a 16-SOIC package and operates within a supply voltage range of 3V to 5.5V. It provides a data rate of up to 5Mbps and offers a common-mode transient immunity (CMTI) of 15kV/µs. The operating temperature range extends from -40°C to 85°C.

Feature Summary

• Galvanic isolation for safe bidirectional data communication
• Support for RS-422 and RS-485 differential bus standards
• High common-mode transient immunity for noise rejection

Applications

• Embedded communication systems requiring signal isolation
• Industrial control networks using RS-485 buses
• Data acquisition systems with noisy electrical environments

Procurement Notes

Verify the specific suffix '3E' against the manufacturer's current datasheet to confirm pinout and packaging dimensions. Ensure the isolation voltage rating meets system safety requirements. Confirm that the 5Mbps data rate is sufficient for the intended application speed. Check for RoHS compliance status if required by regional regulations.

Selection Notes

Select this component when RS-422 or RS-485 communication requires galvanic isolation between microcontrollers and bus lines. It is suitable for applications needing moderate data rates up to 5Mbps. Consider the 16-SOIC package size for PCB layout constraints. Evaluate the 15kV/µs CMTI specification against the expected noise levels in the installation environment.

Part Context

The IL3122 series belongs to NVE's family of low-cost passive input RS-485 and RS-422 digital isolators. These devices integrate transceiver functionality with high-voltage isolation technology. They are designed to replace traditional optocoupler-based solutions in industrial and embedded communication interfaces.

Replacement Considerations

Consult official substitution guides for compatible parts. Verify functional equivalence regarding isolation voltage and data rate before replacing.