1. SI8717BC-A-ISR Substitution Conclusion Partially compatible replacement; evaluation of high-speed and timing requirements is necessary. The primary advantages of the SI8717BC-A-ISR are its higher isolation voltage (3750 Vrms vs. 3000 Vrms) and superior common-mode transient immunity (35 kV/µs vs. 25 kV/µs), offering better long-term reliability and stability in high-voltage, high-noise industrial environments. However, its key limitations are a lower data rate (15 Mbps vs. 25 Mbps) and significantly higher pulse‑width distortion (25 ns vs. 4 ns). This directly prevents its use in the original design’s 25 Mbps high‑speed signal path, and in applications with stringent timing accuracy—such as PWM or digital communications—it would introduce noticeable pulse‑width errors, potentially compromising system timing integrity. Replacement may be considered if the application is insensitive to speed and timing but prioritizes higher isolation performance.