IL 3085-3E

Overview

The IL3085-3E is a galvanically isolated, high-speed differential bus transceiver designed for bidirectional data communication on balanced transmission lines. It utilizes Giant Magnetoresistive (GMR) technology to provide isolation without requiring isolated side power supplies. The device supports RS422 and RS485 protocols with a data rate of 4Mbps. It features three unidirectional channels with an input-to-output configuration of 2/1 ports. The component operates within a supply voltage range of 3V to 5.5V or 4.5V to 5.5V and offers an isolation voltage of 2500Vrms per UL 1577.

Feature Summary

• Galvanic isolation using GMR technology eliminates the need for isolated power supplies
• High common mode transient immunity of 50 kV/μs typical
• Low quiescent supply current for energy efficiency
• Thermal shutdown protection prevents damage during overheating

Applications

• Industrial automation systems requiring robust noise immunity
• RS485 multi-drop networks supporting up to 32 nodes
• Motor control cabinets in high-power environments
• Data acquisition systems needing reliable long-distance communication

Procurement Notes

Verify that the specific suffix indicates the correct package type, as the IL3085 series is available in QSOP, 0.15-inch SOIC, and 0.3-inch True 8mm 16-pin SOIC packages. Ensure the selected variant matches the required operating temperature range of -40°C to +85°C. Confirm compliance with VDE V 0884-10 and UL 1577 standards if certification documentation is required for your application.

Selection Notes

Select this component when designing systems that require high-speed digital isolation for RS485 or RS422 buses without the complexity of external isolated power converters. The GMR architecture provides superior performance compared to traditional capacitive isolators in noisy environments. Consider the 2500Vrms isolation rating and 7kV ESD protection when selecting components for harsh industrial settings where signal integrity is critical.

Part Context

NVE Corporation specializes in magnetic sensor and isolation products. The IL3085 series represents their low-cost isolated transceiver line, leveraging proprietary GMR technology. This family is designed to replace traditional optocouplers in RS485 applications, offering faster data rates and lower power consumption while maintaining high reliability and long barrier life.

Replacement Considerations

Direct replacements must support 4Mbps data rates and 2500Vrms isolation. Verify pin compatibility for 16-pin SOIC packages. Alternative solutions may include other GMR-based isolators from NVE or competitive capacitive isolators, though functional equivalence requires checking common mode transient immunity and supply voltage ranges.