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 4000Vpk 1 Channel 150Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
General Purpose Digital Isolator 3000Vrms 1 Channel 100Mbps 85kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
1. Substitution Conclusion for ISO721MMDREPG4
This substitution is not fully viable and requires careful evaluation based on application conditions. This device offers significant advantages over the original part in dynamic performance, including a higher data rate (150 Mbps), lower propagation delay (16 ns), and faster rise/fall times (1 ns), enabling faster signal transmission and more precise timing.
Key differences must be noted. Its isolation voltage is specified as 4000Vpk (peak), which translates to approximately 2830Vrms—lower than the original's 3750Vrms rating. This indicates potentially insufficient long-term dielectric withstand capability, making it a derated replacement for high-isolation-voltage applications. Furthermore, its supply voltage range (3-3.6V or 4.5-5.5V) is not compatible with the original part's minimum of 2.5V, precluding its use in low-side supply scenarios from 2.5V to 3V. The package is pin-compatible.
2. Substitution Conclusion for ISO7710FQDQ1
This substitution is partially viable and suitable for scenarios prioritizing reliability and noise immunity. The device similarly outperforms the original in dynamic performance (100 Mbps, 16 ns). Its standout feature is an exceptionally high 85 kV/µs Common-Mode Transient Immunity (CMTI), far superior to the original's 35 kV/µs. This ensures more stable and reliable signal transmission in electrically noisy environments such as motor drives and power supplies.
A key deviation is its isolation voltage of 3000Vrms, lower than the original's 3750Vrms, also constituting a derated replacement in terms of dielectric strength. However, it offers significant advantages: its supply voltage range (2.25V-5.5V) fully covers and exceeds the original's specification. Crucially, it carries AEC-Q100 automotive qualification, which typically implies a higher quality grade, reliability, and operational temperature range compared to standard industrial-grade components. The package is compatible.
Analysis ID: 33D9-EDCD000
Based on part parameters and for reference only. Not to be used for procurement or production.
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