Original Part
Alternative Part
1. ADM1485JRZ-REEL Substitution Conclusion
The ADM1485JRZ-REEL is a performance-enhanced direct replacement with a high degree of drop-in feasibility. It is fully compatible with the original part in terms of core electrical interface (supply voltage: 4.75V to 5.25V) and physical package (8-SOIC), allowing for direct substitution without modifications to the power supply or PCB layout. The differences lie in the data rate (30Mbps vs. 5Mbps) and receiver hysteresis (70mV vs. unspecified). The higher data rate not only easily accommodates the original application's requirements but also provides superior noise immunity and enhanced capability for long-line transmission. The increased receiver hysteresis offers improved noise margin, enabling more reliable detection of valid signals in noisy industrial environments. System performance will be enhanced following the substitution.
2. ADM3485EARZ-REEL Substitution Conclusion
The ADM3485EARZ-REEL is not a direct replacement; it is a compatible option requiring system-level evaluation. The fundamental barrier to direct substitution is the complete incompatibility in supply voltage (3V to 3.6V vs. 4.75V to 5.25V). This device is intended for 3.3V logic systems; inserting it directly into an original 5V-powered circuit will cause device failure or malfunction. While its data rate (10Mbps) is sufficient for the original application and it is also a half-duplex RS-485 transceiver, the voltage discrepancy is a critical constraint. It is only a viable alternative if the target system's overall power architecture is 3.3V-based; otherwise, significant changes to the power supply design are necessary.
Analysis ID: 9137-4BD1000
Based on part parameters and for reference only. Not to be used for procurement or production.
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