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 150Mbps 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. ISO721MD Substitution Conclusion
The ISO721MD can serve as a substitute, but its suitability is highly dependent on specific application requirements. Compared to the original part, the key differences are as follows: The isolation voltage is reduced from 3750 Vrms to 2500 Vrms, which may be insufficient for applications requiring a higher level of electrical safety isolation, such as in industrial or medical equipment. The data rate is significantly increased from 15 Mbps to 150 Mbps, and propagation delay is notably reduced—a beneficial upgrade for high-speed digital signal transmission. Its common-mode transient immunity (CMTI) is lowered from 35 kV/µs to 25 kV/µs, weakening noise immunity in high-noise environments like motor drives. Additionally, the minimum supply voltage increases from 2.5 V to 3 V, which may not be compatible with certain low-voltage circuits. If the application does not demand high isolation voltage or robust noise immunity but prioritizes higher speed and lower latency, the ISO721MD represents a viable performance‑upgrade alternative.
2. ISO721D Substitution Conclusion
The ISO721D can also be considered as a substitute, though its applicability requires careful evaluation against the application conditions. Similar to the ISO721MD, its isolation voltage and CMTI are lower than those of the original part—reduced to 2500 Vrms and 25 kV/µs, respectively—representing the primary performance downgrade risks. Its data rate is increased to 100 Mbps, which, while not as high as the ISO721MD, remains well above the original part’s 15 Mbps and can meet higher‑speed data transmission needs. Propagation delay and pulse‑width distortion fall between the original part and the ISO721MD, still offering an improvement. The supply voltage range is also changed to 3 V–5.5 V. In summary, if the application can tolerate the lower isolation and noise immunity specifications while requiring a moderate increase in signal transmission speed, the ISO721D is a feasible alternative.
Analysis ID: 9887-6B16000
Based on part parameters and for reference only. Not to be used for procurement or production.
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