Original Part
General Purpose Digital Isolator 3750Vrms 1 Channel 15Mbps 35kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
Alternative Part
General Purpose Digital Isolator 2500Vrms 1 Channel 100Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
General Purpose Digital Isolator 2500Vrms 1 Channel 100Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
1. ISO721D Substitution Conclusion
The feasibility of substituting the SI8716BC-A-ISR with the ISO721D is highly application-dependent and does not constitute a direct, drop-in replacement. The key differences are as follows: The ISO721D offers a higher data rate (100 Mbps vs. 15 Mbps) and superior timing performance (lower propagation delay and pulse-width distortion), providing reduced signal latency and higher integrity for high-speed digital signal transmission. However, its isolation ratings—isolation voltage (2500 Vrms vs. 3750 Vrms) and common-mode transient immunity (CMTI, 25 kV/µs vs. 35 kV/µs)—are inferior to the original part. In applications with harsh electrical noise or stringent safety isolation requirements (e.g., industrial motor drives, high-voltage power supplies), this may result in insufficient reliability and safety margin. Furthermore, its minimum operating voltage is 3V (compared to 2.5V for the original device). If the existing design operates within a 2.5V to 3V supply range, direct compatibility cannot be guaranteed.
2. ISO722DRG4 Substitution Conclusion
The substitution conclusion for the ISO722DRG4 is identical to that for the ISO721D, as their core electrical parameters are the same. As a replacement, it represents a significant performance upgrade in terms of data rate and signal transmission latency, making it suitable for higher-speed communication needs. However, its critical safety isolation characteristics—isolation voltage and CMTI—are downgraded. It is not suitable for the high-voltage, high-noise-immunity environments for which the original design was intended or may require. Direct substitution could introduce reliability risks. Similarly, its 3V minimum supply voltage may cause compatibility issues with existing low-voltage circuitry. It may only be considered as a performance-upgrade substitute if the application environment is confirmed to have low noise levels, the isolation voltage requirement does not exceed 2500 Vrms, and the supply voltage is compatible.
Analysis ID: E5A2-1B09000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com