1. Substitution Conclusion for SI8716BC-A-IS This device is not recommended as a direct substitute. The primary disqualifying factor is its significantly lower data rate (15 Mbps) compared to the original part (100 Mbps). It is only suitable for low-speed signal isolation. Deploying it in the original high-speed or pulse signal application would result in signal integrity degradation or communication failure. While it offers a superior common-mode transient immunity (CMTI) of 35 kV/µs versus the original's 15 kV/µs—providing more robust performance in high-noise environments—and a wider operating voltage range (starting from 2.5V), it lacks explicit AEC-Q100 automotive-grade qualification. This omission represents a significant risk for the original automotive-targeted design. Furthermore, although its nominal isolation voltage (3750 Vrms ≈ 5300 Vpk) appears higher on paper than the original's 4000 Vpk, the difference in rating standards (Vrms vs. Vpk) necessitates a careful re-evaluation and formal approval within the design process.