SI88444ED-ISR

Overview

The SI88444ED-ISR is a Skyworks Solutions digital isolator featuring four channels with integrated DC-DC conversion. It operates within a 3 V to 5.5 V supply range and supports data rates up to 100 Mb/s. The device provides 5000 Vrms isolation voltage using capacitive coupling technology. Key electrical parameters include a maximum propagation delay of 18 ns, rise/fall times of 2.5 ns, and a common-mode transient immunity of 40 kV/µs. It functions in temperatures from -40°C to +125°C and is housed in a 20-SOIC package.

Feature Summary

• Integrates an isolated DC-DC converter for power delivery across the isolation barrier
• Provides high-speed signal transmission with low propagation delay
• Offers robust noise immunity through high common-mode transient rejection
• Supports unidirectional data flow across four independent channels

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reliable signal separation
• Power electronics control circuits
• Communication interfaces demanding high noise immunity

Procurement Notes

Verify component status as NRND (Not Recommended for New Designs). Confirm package dimensions match 20-SOIC specifications. Ensure compatibility with existing PCB layouts due to potential obsolescence. Check datasheet revisions for updated electrical characteristics before finalizing procurement decisions.

Selection Notes

Select this component when integrated power isolation is required alongside signal transmission. Verify that the 100 Mb/s data rate meets system timing requirements. Ensure the 5000 Vrms isolation rating satisfies safety standards. Consider the 20-SOIC footprint for board space constraints.

Part Context

Part of the Si8844x series, designed for general-purpose digital isolation. Combines signal isolation with power management in a single package. Targets applications where separate power supplies on both sides of the isolation barrier are undesirable or impractical.

Replacement Considerations

Check for direct substitutes like SI88444EC-ISR if available. Evaluate pin-to-pin compatibility and electrical parameter equivalence. Review manufacturer notices for end-of-life notifications or recommended design changes.