Original Part
Alternative Part
1. ADM3485EARZ Substitution Conclusion
The feasibility of using ADM3485EARZ as a replacement for SP1485ECN-L/TR is limited due to differences in supply voltage and data rate. The ADM3485EARZ operates from a 3V to 3.6V supply, whereas the original part is rated for 4.75V to 5.25V. Direct substitution would require redesigning the power supply or adding a voltage translation circuit; otherwise, device damage or functional failure may occur. Its data rate is 10 Mbps, lower than the original’s 20 Mbps, which would restrict communication bandwidth and degrade performance in high-speed applications. Additionally, the receiver hysteresis is 50 mV compared to 20 mV for the original. While this improves noise immunity, it may alter signal threshold levels, requiring signal integrity evaluation in the target system. Substitution should only be considered if the system can accommodate 3.3V operation and accept the lower data rate.
2. ISL4485EIBZ Substitution Conclusion
The ISL4485EIBZ is a viable replacement for SP1485ECN-L/TR, with key differences mainly in supply voltage range and receiver hysteresis. The ISL4485EIBZ supports a supply voltage of 4.5V to 5.5V, which is compatible with the original part’s 4.75V to 5.25V range, allowing direct substitution without voltage adjustment. The data rate remains 20 Mbps, ensuring consistent communication performance. However, its receiver hysteresis is 70 mV, significantly higher than the original’s 20 mV. This provides stronger noise immunity and can enhance system reliability in noisy environments, but may reduce sensitivity to weak signals. Signal quality testing in the actual application is recommended. Overall, this device aligns well with the electrical and functional parameters of the original and is a suitable alternative.
Analysis ID: CE93-B9D6000
Based on part parameters and for reference only. Not to be used for procurement or production.
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