SI88643EC-AS

Overview

The SI88643EC-AS is a quad digital isolator from Skyworks Solutions, featuring an integrated DC-DC converter. It provides four unidirectional channels with a data rate of 100 Mb/s and a propagation delay of 18 ns. The device offers 5000 Vrms isolation voltage via capacitive coupling and operates on a 3 V to 5.5 V supply. It supports a common-mode transient immunity of 40 kV/µs and functions within a temperature range of -40°C to +125°C in a 24-SOIC package.

Feature Summary

• Integrates a high-frequency DC-DC converter for isolated power delivery
• Provides four unidirectional signal channels for data transmission
• Utilizes capacitive coupling technology for electrical isolation

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing high-voltage safety barriers
• Power metering applications with isolated communication interfaces

Procurement Notes

Verify the specific suffix 'AS' against official Skyworks documentation to confirm pinout and functional configuration. Ensure the selected variant matches the required isolation voltage rating of 5000 Vrms for your design. Cross-reference the 24-SOIC package dimensions with your PCB layout constraints. Confirm AEC-Q100 qualification status if automotive reliability is mandated by your application specifications.

Selection Notes

Select this component when a single-chip solution for both signal isolation and isolated power generation is required. The integrated DC-DC converter eliminates the need for external magnetic components. Consider the 100 Mb/s data rate and 18 ns latency for timing-sensitive industrial protocols. Evaluate the 40 kV/µs CMTI specification for environments with high dv/dt noise.

Part Context

This part belongs to the Si8864x family of quad digital isolators. It combines signal isolation capabilities with an integrated power converter. The family targets applications demanding compact designs with high reliability. The SOIC-24 package allows for dense PCB layouts while maintaining necessary creepage and clearance distances.

Replacement Considerations

SI88643EC-IS is a verified substitute offering identical functionality with a 3750 Vrms isolation rating.