IL 485W

Overview

The IL485W is a galvanically isolated, high-speed differential bus transceiver designed for bidirectional data communication on balanced transmission lines. It utilizes NVE’s patented IsoLoop spintronic Giant Magnetoresistance (GMR) technology to provide electrical isolation. The device meets ANSI Standards EIA/TIA-422-B and RS-485 and is compatible with 3.3V input supplies. Key specifications include 2500 VRMS isolation, a maximum propagation delay of 25 ns, a data rate of 35 Mbps, and a typical pulse skew of 1 ns. It features ±60 mA driver output capability and thermal shutdown protection.

Feature Summary

• Galvanic isolation using patented IsoLoop spintronic Giant Magnetoresistance technology
• High-speed differential bus transceiver for bidirectional data communication
• Compatible with 3.3V input supplies and standard 16-pin SOIC package
• Thermal shutdown protection and ±60 mA driver output capability

Applications

• Profibus/RS485 systems
• Multiple data point transmission
• Multi-point transmission on long bus lines in noisy environments

Procurement Notes

Verify the specific suffix (e.g., W vs. WE) against the manufacturer's current datasheet to ensure correct temperature range and packaging options. Confirm that the 16-SOIC package dimensions match your PCB footprint requirements. Ensure compliance with UL1577 and IEC 61010-2001 approvals if required for your final product certification. Cross-reference the exact part number with official NVE documentation to avoid confusion with similar models like the IL485E.

Selection Notes

Select this component when galvanic isolation is required for RS-485 or RS-422 networks operating at speeds up to 35 Mbps. It is suitable for applications needing robust noise immunity in multi-point transmission scenarios. Consider the 2500 VRMS isolation rating and 20kV/µs CMTI if present in related variants, though specific values for the base IL485W should be confirmed in the primary datasheet. Ensure the 3.3V supply compatibility aligns with your system logic levels.

Part Context

The IL485W belongs to NVE’s family of GMR-based digital isolators, specifically engineered for serial communication interfaces. It represents one of the first isolated RS-485 interfaces in a standard 16-pin SOIC package. This series leverages spintronic technology to achieve high performance without traditional magnetic transformers or capacitive coupling, offering distinct advantages in reliability and speed for industrial communication buses.

Replacement Considerations

Publicly confirmed substitute part numbers are not explicitly listed in the provided source material. Users should consult NVE Corporation directly or authorized distributors for validated equivalents. Generic isolated RS-485 transceivers may require significant circuit redesign due to differences in isolation voltage, pinout, and drive strength.