IL 3685-1E

Overview

The IL 3685-1E is a digital isolator transceiver designed for RS-422 and RS-485 communication interfaces. It features a data rate of 40 Mbps and operates with power supplies ranging from 3 V to 5 V. The device provides 2500 Vrms isolation voltage and supports up to three channels. Key electrical parameters include a propagation delay of 20 ns, a common-mode transient immunity (CMTI) of 30 kV/µs, and hot-plug capability. It is housed in a 16-pin SSOP package.

Feature Summary

• Supports RS-422 and RS-485 communication protocols
• Provides galvanic isolation between signal domains
• Capable of hot-plugging without damaging the bus or device
• Fully compliant with PROFIBUS standards

Applications

• Industrial automation control systems
• PROFIBUS network nodes
• Isolated serial communication interfaces
• Data acquisition systems requiring high noise immunity

Procurement Notes

Verify the specific suffix '1E' against the manufacturer's datasheet to confirm pinout and channel configuration. Ensure the selected package matches the 16-SSOP form factor required by the PCB layout. Confirm that the operating voltage range aligns with the system's power supply rails before integration.

Selection Notes

Select this component when an isolated RS-485 or RS-425 interface is required with moderate speed up to 40 Mbps. It is suitable for applications needing hot-plug protection and high common-mode transient immunity. Consider the 16-SSOP package constraints during mechanical design. Verify compatibility with the target microcontroller logic levels.

Part Context

This part belongs to NVE's IsoLoop family of digital isolators utilizing Giant Magnetoresistive (GMR) technology. The IL 3685 series specifically targets industrial serial communication standards. It integrates the transceiver functionality with isolation barriers in a single compact package, simplifying board design compared to discrete solutions.

Replacement Considerations

Check for direct substitutes within the IL 3685 series, such as the IL 3685-3E for different channel configurations. Verify pin-to-pin compatibility with other isolated RS-485 transceivers if cross-referencing with competitors. Ensure replacement parts maintain the same isolation voltage and data rate specifications.