1. Substitution Conclusion for SI8610AB-B-ISR The SI8610AB-B-ISR is not recommended as a direct replacement for the ISO7710FDR due to significant gaps in key performance parameters, which may lead to functional or reliability issues in demanding applications. The differences and their impacts are as follows: First, the isolation voltage is lower (2500 Vrms vs. 3000 Vrms). If the original design relies on a 3000 Vrms insulation rating, the substitution risks reducing the safety margin. Second, common-mode transient immunity (CMTI) is substantially reduced (35 kV/µs vs. 85 kV/µs). In high‑noise environments such as power switching (e.g., motor drives, power supplies), this could cause signal false‑triggering due to noise interference. Third, the data rate is very low (1 Mbps vs. 100 Mbps), limiting it to low‑speed signal transmission and making it unsuitable for high‑speed communication or fast control loops. Fourth, timing performance is inferior (propagation delay up to 35 ns, pulse‑width distortion 25 ns), introducing greater signal delay and distortion that can degrade system real‑time response and synchronization accuracy. In summary, substitution may only be considered in non‑critical, low‑frequency circuits where isolation voltage, speed, and noise immunity are not stringent requirements; otherwise, system compatibility must be re‑evaluated.