Original Part
General Purpose Digital Isolator 2500Vrms 1 Channel 1Mbps 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 4000Vpk 1 Channel 100Mbps 15kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
1. ISO721MDG4 Substitution Conclusion
The ISO721MDG4 demonstrates significantly superior signal processing performance compared to the original SI8610AB-B-IS, including higher data rate (150 Mbps vs. 1 Mbps), lower propagation delay (16 ns vs. 35 ns), and lower pulse‑width distortion (1 ns vs. 25 ns). It is therefore capable of faster and more accurate signal transmission in high‑speed applications. However, its common‑mode transient immunity (CMTI) is lower (25 kV/µs vs. 35 kV/µs), which may reduce noise immunity in high‑noise or transient‑voltage environments. Additionally, its supply voltage range is narrower (3 V–5.5 V vs. 2.5 V–5.5 V) and does not support 2.5 V operation, making it potentially incompatible in applications requiring low‑voltage supply. The package footprint is identical. Provided the application does not require 2.5 V supply and does not have stringent CMTI requirements, the ISO721MDG4 can be a viable performance‑upgrade substitute.
2. ISO722QDRQ1 Substitution Conclusion
The ISO722QDRQ1 offers higher isolation voltage (4000 Vpk, approximately 2828 Vrms, compared to 2500 Vrms of the original part) and automotive‑grade qualification (AEC‑Q100), making it better suited for high‑isolation requirements or harsh automotive electronic environments. Its data rate (100 Mbps) is substantially higher than the original device, supporting faster communication. However, its common‑mode transient immunity (CMTI) is notably lower (15 kV/µs vs. 35 kV/µs), which may increase the risk of signal errors in high‑noise applications. The supply voltage range is narrower (3 V–5.5 V) and does not support 2.5 V operation. While its propagation delay (24 ns) is better than the original device, it is not as low as that of the ISO721MDG4. If the application demands enhanced isolation or automotive‑grade reliability and can tolerate the lower CMTI and supply voltage limitations, the ISO722QDRQ1 can be considered as a substitute, though careful evaluation of stability in noisy environments is recommended.
Analysis ID: E118-6B13000
Based on part parameters and for reference only. Not to be used for procurement or production.
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