Original Part
Alternative Part
1. ST485ERBDR Substitution Conclusion
The ST485ERBDR is a less viable substitute primarily due to its significantly lower data rate (2.5 Mbps) compared to the original part’s 20 Mbps. In high‑frequency communication scenarios, this may lead to insufficient transmission performance, potentially causing data latency or loss. Additionally, its receiver hysteresis voltage (70 mV) is considerably higher than the original’s 20 mV. While this improves noise immunity, it may reduce sensitivity to small signal variations—a trade‑off that must be evaluated based on the specific electromagnetic environment. Other key parameters such as supply voltage (5 V) and package (8‑SOIC) remain compatible. Therefore, this substitute is only suitable for low‑speed, high‑noise applications where data rate is not critical.
2. ADM3485EARZ Substitution Conclusion
The ADM3485EARZ requires careful evaluation as a replacement. The core difference lies in its 3.3 V supply voltage versus the original 5 V, which could lead to power‑incompatibility issues and may necessitate a redesign of the power circuitry. Although its data rate (10 Mbps) is lower than the original’s 20 Mbps, it remains adequate for most mid‑speed communication applications. Furthermore, its receiver hysteresis voltage (50 mV) is higher than the original, offering a balanced compromise between noise rejection and signal stability. Package compatibility (8‑SOIC) simplifies layout adaptation. Overall, substitution is feasible provided the voltage matching is resolved, making it suitable for mid‑speed, low‑power systems after proper voltage adaptation.
Analysis ID: 73B7-A7D7000
Based on part parameters and for reference only. Not to be used for procurement or production.
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