SI88643EC-IS

Overview

The SI88643EC-IS is a Skyworks Solutions digital isolator featuring four unidirectional channels and an integrated DC-DC converter. It provides 3750 Vrms isolation via capacitive coupling. The device operates at data rates up to 100 Mb/s with a propagation delay of 18 ns. Supply voltage ranges from 3 V to 5.5 V, with a typical operating current of 9.5 mA. It supports pulse widths of 10 ns and exhibits rise/fall times of 2.5 ns. The component is housed in a SOIC-24 package and is qualified under AEC-Q100 standards for automotive applications.

Feature Summary

• Integrates a high-efficiency isolated DC-DC converter to power the secondary side without external components.
• Utilizes proprietary capacitive coupling technology for robust signal transmission across isolation barriers.
• Features unidirectional channel configuration optimized for specific directional data flow requirements.

Applications

• Automotive electronic control units requiring certified isolation
• Industrial motor drive systems
• Power supply feedback loops

Procurement Notes

Verify the specific suffix 'IS' against the manufacturer's latest datasheet to confirm pinout compatibility and functional specifications. Ensure that the AEC-Q100 qualification status aligns with your target application's reliability requirements. Cross-reference the SOIC-24 footprint dimensions with your PCB design guidelines to prevent assembly errors during procurement.

Selection Notes

Select this component when a combination of four-channel digital isolation and integrated power conversion is required within a single package. The unidirectional nature dictates signal flow direction, so verify input/output orientation matches the system architecture. Consider the 3750 Vrms rating relative to the highest transient voltage expected in the isolation barrier environment.

Part Context

This part belongs to the Si8864x family of digital isolators from Skyworks Solutions. It shares the SOIC-24 form factor with other variants but differs in channel count and isolation voltage ratings. The integrated DC-DC converter distinguishes it from non-converter models in the same series, offering a compact solution for isolated power domains.

Replacement Considerations

Direct substitutes include SI88640EC-IS for all-forward channels or SI88644EC-AS for reverse configurations. Verify that alternative parts maintain the same SOIC-24 package and AEC-Q100 qualification if automotive compliance is mandatory.