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 3000Vrms 1 Channel 25Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
1. ISO722MDRG4 Substitution Conclusion
Direct substitution is not recommended. While the ISO722MDRG4 significantly outperforms the original part in dynamic performance (data rate: 150 Mbps, propagation delay: 16 ns), its critical safety isolation parameters are severely degraded. Its isolation voltage is only 2500 Vrms (vs. 3750 Vrms for the original part), and its common-mode transient immunity (CMTI) is 25 kV/µs (vs. 35 kV/µs for the original part). In high-voltage, high-noise application environments—such as motor drives and power supplies—its electrical isolation strength and noise immunity are insufficient to meet the original design's safety margin, posing a reliability risk. Furthermore, its minimum supply voltage is 3V (vs. 2.5V for the original part), making it incompatible with systems requiring a 2.5V low-voltage supply.
2. ISO7310CQDRQ1 Substitution Conclusion
Substitution is conditionally recommended, pending application-specific evaluation. The ISO7310CQDRQ1 aligns more closely with the original part in core isolation performance: its isolation voltage is 3000 Vrms (slightly below the original 3750 Vrms), and its data rate of 25 Mbps meets the original requirement of 15 Mbps. The key deviation is its CMTI of 25 kV/µs (lower than the original 35 kV/µs), resulting in marginally weaker noise immunity in extremely harsh EMI environments. Its primary advantage is its Automotive-grade (AEC-Q100) qualification, which typically offers superior reliability and a wider operating temperature range compared to standard industrial-grade devices. For applications not requiring the highest CMTI specifications, and where a 3000 Vrms isolation voltage satisfies system safety standards, this device is not only a viable substitute but can also add value to designs demanding high reliability. Note that its minimum supply voltage is also 3V.
Analysis ID: CF06-6C13000
Based on part parameters and for reference only. Not to be used for procurement or production.
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