Original Part
Alternative Part
1. ST485ERBDR Substitution Conclusion
The key differences between this part and the original are the data rate (2.5Mbps vs. 10Mbps) and receiver hysteresis (70mV vs. 20mV). The significantly lower data rate limits its use to applications with low communication speed requirements, making it unsuitable for the high-speed transmission supported by the original part. The higher receiver hysteresis, however, improves noise immunity, making it better suited for environments with significant noise interference. Substitution may be considered if the original system operates below 2.5Mbps and requires enhanced noise rejection; otherwise, it is not compatible.
2. ADM3485EARZ Substitution Conclusion
The primary differences from the original part are the supply voltage range (3.0V–3.6V vs. 4.75V–5.25V) and receiver hysteresis (50mV vs. 20mV). The voltage incompatibility prevents direct use in the original 5V system, requiring either a redesigned power supply or level-shifting circuitry. While the increased hysteresis improves noise immunity, the critical limitation remains the supply voltage mismatch. Substitution is feasible only if the system can be modified to operate at 3.3V while still requiring a 10Mbps data rate; otherwise, a direct replacement is not possible.
Analysis ID: A3AD-C3D2000
Based on part parameters and for reference only. Not to be used for procurement or production.
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