SI88644BC-IS

Overview

The SI88644BC-IS is a quad digital isolator from Skyworks Solutions, utilizing capacitive coupling technology to provide electrical isolation between circuits. It features four unidirectional channels with a data rate of 100 Mb/s and an insulation voltage of 5000 Vrms. The device operates within a supply voltage range of 3 V to 5.5 V and supports a maximum propagation delay of 18 ns. It is housed in a 24-pin SOIC package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates four independent unidirectional signal paths for high-density isolation applications
• Employs silicon dioxide-based capacitive coupling for robust noise immunity and long-term reliability
• Includes integrated DC-DC converter capability to support isolated power transfer requirements

Applications

• Industrial automation control systems requiring galvanic isolation
• Medical equipment interfaces needing high-voltage safety compliance
• Power electronics monitoring and gate drive circuits

Procurement Notes

Verify the specific suffix 'IS' against official Skyworks documentation to confirm it denotes industrial temperature grade and lead-free status. Ensure the 24-SOIC package dimensions match your PCB footprint constraints. Confirm that the 5000 Vrms isolation rating meets your system's safety regulatory requirements before finalizing procurement.

Selection Notes

Select this component when four isolated bidirectional or unidirectional channels are required in a compact form factor. The 100 Mb/s data rate suits standard communication protocols like SPI and UART. Consider the 5000 Vrms isolation barrier for applications demanding higher dielectric strength compared to lower-rated alternatives.

Part Context

This part belongs to the Si886xx family of digital isolators, which integrates isolation barriers with optional on-chip power conversion. The SI88644 variant specifically provides four output channels, distinguishing it from dual-channel models in the same series. It addresses the need for multi-channel isolation in space-constrained designs.

Replacement Considerations

Direct substitutes include other Skyworks Si8864x variants with matching channel counts and isolation ratings. Verify pin compatibility and thermal performance when cross-referencing with competitors offering similar quad-channel capacitive isolators.