1. SI8718BC-A-ISR Substitution Conclusion Direct substitution is not recommended. Although the SI8718BC-A-ISR offers a slightly higher isolation voltage (3750 Vrms) compared to the original part, its core performance parameters show significant gaps. First, its data rate (15 Mbps) is far lower than the original’s 100 Mbps, making it unsuitable for applications requiring high‑speed signal transmission. Second, its common‑mode transient immunity (35 kV/µs) is less than half that of the original (85 kV/µs), which substantially reduces its noise immunity and reliability in harsh‑noise environments such as motor drives and inverters. Finally, its propagation delay (50 ns) and pulse‑width distortion (25 ns) are considerably larger than those of the original (16 ns and 4.9 ns), severely impacting timing accuracy in high‑speed digital signals. Additionally, it lacks the automotive‑grade (AEC‑Q100) certification of the original, and its operating voltage range starts at a higher level (2.5 V vs. 2.25 V). This device is only suitable for non‑automotive general‑purpose isolation where speed, timing, and noise immunity are not critical, and cannot serve as a replacement for high‑performance or automotive‑grade applications.