Original Part
General Purpose Digital Isolator 2500Vrms 1 Channel 100Mbps 25kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
Alternative Part
General Purpose Digital Isolator 3750Vrms 1 Channel 15Mbps 35kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
General Purpose Digital Isolator 3750Vrms 1 Channel 15Mbps 35kV/µs CMTI 8-SOIC (0.154", 3.90mm Width)
1. SI8718BC-A-ISR Substitution Conclusion
The SI8718BC-A-ISR can be substituted for the ISO722DRG4 under certain conditions, but a careful evaluation of the application requirements is necessary. Key differences include:
A reduction in data rate from 100 Mbps to 15 Mbps, making it unsuitable for high-speed communication interfaces or real-time control systems.
An increase in maximum propagation delay from 24 ns to 50 ns and a significant increase in maximum pulse width distortion from 2 ns to 25 ns. These changes may introduce signal timing errors and degrade signal integrity, impacting precision timing applications.
An improvement in isolation voltage from 2500 Vrms to 3750 Vrms and a higher common-mode transient immunity (CMTI) from 25 kV/µs to 35 kV/µs. This makes it superior for high-voltage isolation and noise immunity, suitable for harsh industrial or medical environments.
An extended supply voltage range of 2.5V to 5.5V, offering greater flexibility for lower-voltage power rails.
If the application does not demand high speed or tight timing precision but prioritizes robust isolation and noise immunity, the SI8718BC-A-ISR can be a viable alternative.
2. SI8719BC-A-ISR Substitution Conclusion
The substitution feasibility for the SI8719BC-A-ISR is similar to that of the SI8718BC-A-ISR, as both share identical key parameters. Compared to the ISO722DRG4:
The data rate is significantly reduced to 15 Mbps, meaning it cannot support the original part's high-speed data transfer applications.
Propagation delay and pulse width distortion are notably higher (increasing from 24 ns to 50 ns and 2 ns to 25 ns, respectively). This introduces greater signal latency and distortion risk, adversely affecting critical timing performance.
Isolation voltage is improved to 3750 Vrms and CMTI to 35 kV/µs, offering superior high-voltage safety and electromagnetic compatibility for applications requiring reinforced insulation.
The wider supply voltage range (2.5V to 5.5V) provides better compatibility with lower-voltage systems.
In summary, if the application emphasizes high isolation and noise immunity over data rate and timing precision, the SI8719BC-A-ISR can substitute for the ISO722DRG4. Otherwise, it is not recommended.
Analysis ID: B830-79F7000
Based on part parameters and for reference only. Not to be used for procurement or production.
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