2. SI8610AB-B-ISR Substitution Conclusion The SI8610AB-B-ISR exhibits significant mismatches in critical dynamic performance parameters, making it unsuitable as a replacement for the ISO721MD. Its data rate is only 1Mbps versus the original's 150Mbps, rendering it unusable in any medium-to-high-speed signal transmission application. Concurrently, its significantly degraded propagation delay (35ns vs. 16ns) and pulse width distortion (25ns vs. 1ns) result in poor signal timing accuracy, which would cause errors in synchronous or pulse-width-sensitive applications. Although its isolation voltage, CMTI (35kV/µs), and supply range are comparable or superior to the original, the extremely low bandwidth and slow timing performance restrict its use to very low-speed, non-timing-critical switch signal isolation. It cannot serve as a substitute unless the application has extremely low speed requirements (≤1Mbps) and no concern for timing precision.