SI88644EC-AS

Overview

The SI88644EC-AS is a four-channel digital isolator from Skyworks Solutions, housed in a 24-SOIC package. It supports unidirectional data transmission at rates up to 100 Mb/s with a maximum propagation delay of 18 ns. The device operates on supply voltages between 3 V and 5.5 V and provides an insulation voltage of 5000 Vrms. It features a common-mode transient immunity of 40 kV/µs and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Provides galvanic isolation for four independent signal channels
• Supports high-speed data transmission up to 100 Mbps
• Features robust common-mode transient immunity for noise rejection
• Operates reliably across extended industrial temperature ranges

Applications

• Industrial automation control systems
• Medical equipment signal isolation
• Power electronics gate drive interfaces
• Data acquisition system isolation barriers

Procurement Notes

Verify the specific suffix 'AS' against official Skyworks documentation to confirm it denotes the standard SOIC-24 tube packaging variant. Ensure compatibility with required insulation standards such as UL or VDE if applicable to your design. Confirm that the unidirectional channel configuration meets your circuit's signal flow requirements before finalizing procurement.

Selection Notes

Select this component when four isolated bidirectional paths are not required, specifically for unidirectional applications. Compare the 18 ns propagation delay against system timing budgets. Verify that the 24-pin SOIC footprint fits the PCB layout constraints. Consider the 5000 Vrms insulation rating relative to the working voltage of the isolated circuits.

Part Context

This part belongs to the Si88644 family of general-purpose digital isolators. It shares core specifications with variants like the SI88644EC-IS, which includes an integrated DC-DC converter. The EC-AS variant relies on external power supplies for both sides, offering a simpler architecture for cost-sensitive or space-constrained designs requiring basic channel isolation.

Replacement Considerations

The SI88644EC-IS serves as a functional alternative if an integrated DC-DC converter is needed for isolated power generation. Other Skyworks isolators may require pinout verification due to potential differences in channel directionality or package types.