SI88421EC-IS

Digital Isolators Overview

The SI88421EC-IS is a dual-channel digital isolator from Skyworks Solutions, featuring an integrated secondary-sensing feedback-controlled DC-DC converter. It provides 5000 Vrms isolation with a data rate of 100 Mb/s and a propagation delay of 17.5 ns typical. The device operates on a supply voltage range of 3 V to 5.5 V and supports unidirectional signal transmission. It offers a common-mode transient immunity of 40 kV/µs and functions within a temperature range of -40°C to +125°C. Packaged in a 16-SOIC format, it ensures reliable high-speed data transfer across isolation barriers.

Digital Isolators Feature Summary

• Integrates a fully-featured secondary sensing feedback-controlled DC-DC converter for isolated power generation
• Provides robust signal isolation with 5000 Vrms insulation voltage capability
• Delivers high-speed data transmission at 100 Mb/s with low propagation delay
• Ensures signal integrity through 40 kV/µs common-mode transient immunity

Digital Isolators Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing high-voltage safety compliance
• Power electronics monitoring and control circuits
• Smart grid infrastructure communication interfaces

Digital Isolators Procurement Notes

Verify the specific suffix 'EC' against official Skyworks documentation to confirm package type and thermal characteristics. Ensure the integrated DC-DC converter requirements match your system's power budget. Confirm AEC-Q100 automotive qualification status if deploying in vehicle applications. Check current lifecycle status as some variants may be recommended against new designs. Validate isolation voltage ratings against local regulatory standards before integration.

Digital Isolators Selection Notes

Select this component when both high-speed data isolation and integrated isolated power are required in a single package. The 16-SOIC footprint suits space-constrained PCB layouts. Consider the 100 Mb/s speed limit for bandwidth requirements. The wide operating temperature range supports harsh industrial environments. Evaluate the 40 kV/µs CMTI for noisy electrical surroundings.

Digital Isolators Part Context

This part belongs to the Si88x2x family of digital isolators, which combines signal isolation with integrated DC-DC conversion. Unlike standard isolators, it eliminates the need for external isolated power supplies. The family targets applications demanding high reliability and compact design. The SI88421EC-IS specifically offers dual channels with unidirectional data flow.

Digital Isolators Replacement Considerations

SI88421EC-IS serves as a direct functional equivalent to other dual-channel isolators with integrated converters. ISO7421EQDWRQ1 is listed as a similar alternative by distributors. Verify pinout compatibility and isolation voltage ratings when substituting. Ensure the replacement also includes a feedback-controlled DC-DC converter to maintain system architecture.