Original Part
Alternative Part
1. ISL32478EIBZ Substitution Conclusion
The ISL32478EIBZ is a viable substitute for the ADM487EWARZ in terms of basic functionality (half-duplex RS-422/485, 1/1 unit load, 8-SOIC package) and its wider supply voltage range (4.5V to 5.5V). However, key differences include a significantly higher data rate of 15 Mbps (compared to 250 kbps for the original part) and a receiver hysteresis of only 25 mV (versus 70 mV for the original part). This makes the device suitable for high-speed applications demanding faster communication, but the lower receiver hysteresis may result in weaker noise immunity and signal integrity under the same noisy conditions. In long cable runs or complex EMI environments, this could increase the risk of bit errors. Additionally, note that the ISL32478EIBZ is not specified as an “Automotive” grade component; if intended for automotive electronic systems, its reliability and qualification should be re-evaluated accordingly.
2. ISL32492EIBZ Substitution Conclusion
The ISL32492EIBZ matches the ADM487EWARZ in protocol, architecture, package, and data rate (250 kbps), and offers a wider supply voltage range (4.5V to 5.5V). The critical distinction is its receiver hysteresis of only 25 mV (compared to 70 mV for the original part). This implies notably weaker electrical noise rejection relative to the original part. In applications with common-mode noise, ground potential differences, or signal ringing, the receiver may be more susceptible to false triggering due to minor voltage fluctuations, thereby reducing communication robustness. Furthermore, like the ISL32478EIBZ, it lacks automotive-grade certification; direct use in automotive environments may pose compliance and long-term reliability risks.
Analysis ID: A502-A101000
Based on part parameters and for reference only. Not to be used for procurement or production.
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