IL 3585-3E

Overview

The IL 3585-3E is a digital isolator from the IsoLoop series, designed for RS-422 and RS-485 communication. It features three channels with 2500Vrms isolation voltage and supports data rates up to 40 Mbps. The device operates on a 3V to 5.5V supply and utilizes a 16-SOIC package (0.154 inch width). Key electrical specifications include a common-mode transient immunity of 30 kV/µs, propagation delay of 25 ns, and pulse width distortion of 10 ns. It functions as a bus transceiver with non-inverting logic.

Feature Summary

• Provides galvanic isolation for high-speed serial communication interfaces
• Integrates three independent signal channels in a compact surface-mount package
• Offers high common-mode transient immunity to maintain signal integrity in noisy environments
• Compatible with standard microcontroller input voltages without level shifting

Applications

• Industrial automation control systems requiring isolated RS-485 nodes
• Medical equipment needing safety-isolated data transmission paths
• Power electronics monitoring circuits with high-voltage noise exposure
• Building automation networks utilizing RS-422/RS-485 protocols

Procurement Notes

Verify the specific suffix '3E' to ensure correct pinout and isolation rating. Confirm RoHS compliance status as older revisions may differ. Check lead times due to potential supply chain variability for specialized isolation components. Ensure the 16-SOIC footprint matches the PCB design constraints. Validate operating temperature range requirements against the -55°C to 125°C specification.

Selection Notes

Select this component when bidirectional or unidirectional isolation is required for differential signaling standards. Compare CMTI ratings against other options if extreme noise environments are present. Consider the 40 Mbps limit for bandwidth requirements. Evaluate the 2500Vrms isolation barrier against system safety standards. Assess power consumption needs given the 3V to 5.5V operational range.

Part Context

This part belongs to NVE's IsoLoop family, which uses giant magnetoresistive (GMR) technology for signal coupling. Unlike capacitive isolators, GMR devices offer inherent DC isolation and low electromagnetic interference. The IL 3585 series specifically targets robust industrial communication links where reliability and noise rejection are critical.

Replacement Considerations

IL 614 is listed as an obsolete alternative but lacks current availability. Verify functional equivalence carefully as channel counts and isolation voltages may vary between generations. No direct active substitutes are confirmed in the provided documentation.