IL2985

Overview

The IL2985 is a low-cost isolated RS-485 transceiver manufactured by NVE Corp. It utilizes Giant Magnetoresistive (GMR) technology to provide galvanic isolation without requiring an isolated power supply on the receiver side. The device supports data rates up to 4 Mbps and is designed for RS-422 and RS-485 applications. It features a unidirectional channel configuration with three channels, offering 2500 Vrms isolation voltage per UL 1577 standards. Operating voltages range from 3V to 5.5V, ensuring compatibility with standard logic levels while maintaining robust signal integrity in noisy industrial environments.

Feature Summary

• Utilizes GMR technology for high-speed, low-power isolation
• Eliminates need for secondary isolated power supplies
• Provides high common-mode transient immunity
• Includes thermal shutdown protection for reliability

Applications

• Industrial automation control systems
• Building automation networks
• Process control instrumentation
• Factory floor communication buses

Procurement Notes

Verify the specific package variant and temperature grade required for your design. Confirm that the 2500 Vrms isolation rating meets your safety certification requirements. Ensure the 4 Mbps speed is sufficient for your protocol timing. Check for RoHS compliance status if mandated by your region.

Selection Notes

Select this component when cost-effective isolation is needed for RS-485/RS-422 links. It is suitable for designs where adding a second isolated power supply is impractical or too expensive. Consider the 4 Mbps limit; higher speeds require different NVE models like the IL3585. Verify input/output voltage compatibility with your microcontroller interface.

Part Context

The IL2985 belongs to NVE's IsoLoop family of isolated transceivers. These devices replace traditional optocoupler-based solutions by integrating the transmitter, isolator, and receiver into a single chip. This integration reduces board space and simplifies design compared to discrete isolation components.

Replacement Considerations

Direct replacements are limited due to the unique GMR architecture. Designers often substitute with optocoupler-based RS-485 transceivers, though this requires additional isolated power circuitry. Other NVE models like the IL3085 offer similar functionality but may differ in pinout or specific electrical characteristics.