SI88644EC-ISR

Overview

The SI88644EC-ISR is a unidirectional digital isolator from the Si88644 series, manufactured by Skyworks Solutions. It features four reverse channels and zero forward channels, housed in a 24-pin SOIC package. The device supports data rates up to 100 Mb/s with a propagation delay of 18 ns. It provides an insulation voltage of 3750 Vrms (some sources cite 5000 Vrms) and operates on a supply voltage between 3 V and 5.5 V. The component includes an integrated DC-DC converter, functions at temperatures from -40°C to +125°C, and utilizes capacitive coupling for isolation.

Feature Summary

• Integrates a high-efficiency DC-DC converter within the isolation barrier to power isolated side circuits without external components.
• Employs capacitive coupling technology to provide robust signal transmission across the isolation barrier.
• Features unidirectional data flow configuration with multiple output channels for simplified system design.

Applications

• Industrial automation systems requiring galvanic isolation
• Power electronics and motor drive control circuits
• Programmable logic controller (PLC) input/output modules

Procurement Notes

Verify the specific insulation voltage rating (3750 Vrms vs 5000 Vrms) against your system safety requirements, as documentation varies. Confirm the package width and pinout compatibility with your PCB footprint. Ensure the unidirectional channel configuration meets your signal routing needs. Check for RoHS compliance status before finalizing procurement.

Selection Notes

Select this component when a compact solution with an integrated power converter is required for unidirectional signaling. Compare against the SI88644ED-ISR if wider packaging or different thermal characteristics are needed. Consider the SI88640EC-IS if bidirectional communication is necessary instead of unidirectional only.

Part Context

This part belongs to the Si88xx ISOvolt family, which replaces traditional optocouplers with CMOS-based digital isolation. The family emphasizes reduced size, lower power consumption, and higher reliability compared to legacy technologies. The SI88644 variant specifically targets applications needing integrated power generation alongside signal isolation.

Replacement Considerations

The SI88644ED-ISR is a related variant in the same series but typically uses a wider SOIC package. Verify pin-to-pin compatibility and insulation ratings before substitution. No other direct cross-references are confirmed in public documentation.