Original Part
Alternative Part
1. ST485EBDR Substitution Conclusion
The ST485EBDR can essentially serve as a direct replacement. Both are half-duplex RS-485 transceivers operating at a 5V supply voltage and housed in an 8-SOIC package, with fully compatible pinouts. The key difference lies in the receiver hysteresis: the ST485EBDR offers 70 mV, which is significantly higher than the original part's 30 mV. This provides improved noise immunity in electrically noisy environments, though it may introduce a slight increase in signal transition delay. Additionally, its data rate capability (5 Mbps) is slightly higher than the original model (4 Mbps). In practice, care must be taken to ensure the communication baud rate does not exceed the original design limit. For systems operating at 5V and at data rates ≤4 Mbps, the substitution typically requires no hardware modifications.
2. ADM3485EARZ Substitution Conclusion
The ADM3485EARZ is not a drop-in replacement and requires redesign of the power supply and signal level sections. The primary incompatibility is its 3.3V (3V to 3.6V) operating voltage, which is not compatible with the original 5V system. Direct substitution would likely result in communication failure or device damage. Furthermore, its data rate capability (10 Mbps) is higher, and its receiver hysteresis (50 mV) falls between the two compared devices. Implementing this substitution requires a full evaluation of the system's power architecture and logic-level compatibility. It is only potentially suitable if the target system is designed for 3.3V operation; otherwise, level translation or power regulation circuitry must be added.
Analysis ID: 7355-36A5000
Based on part parameters and for reference only. Not to be used for procurement or production.
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