Original Part
Alternative Part
1. ADM1485ARZ-REEL Substitution Conclusion
Based on key electrical parameters and package, the ADM1485ARZ-REEL can serve as a full replacement for the MAX487CSA+. Both are single, half-duplex RS-422/RS-485 transceivers from Analog Devices, sharing identical supply voltage range (4.75V to 5.25V), package (8-SOIC), and receiver hysteresis (70mV). The primary difference lies in data rate: the ADM1485ARZ-REEL supports speeds up to 30 Mbps, significantly higher than the original part's 250 kbps. Substituting with the ADM1485ARZ-REEL substantially increases potential bus communication bandwidth while maintaining backward compatibility; it can be directly swapped in low-speed applications. However, when implementing the replacement, the original system's layout, termination, and node count must be evaluated to ensure they can support the higher speed. Otherwise, signal integrity issues may lead to communication errors.
2. ADM1485ARZ-REEL7 Substitution Conclusion
The feasibility of substituting the MAX487CSA+ with the ADM1485ARZ-REEL7 is identical to the conclusion for the ADM1485ARZ-REEL. These are different packaging forms (tape and reel) of the same device model. The "-REEL7" suffix typically denotes a specific reel size or quantity and carries no difference in electrical specifications or performance compared to the "-REEL" version. The ADM1485ARZ-REEL7 similarly offers the key advantage of a 30 Mbps high-speed data rate, enabling a direct pin-to-pin replacement of the original part and providing greater speed margin for the system. Likewise, designers must pay attention to high-speed layout guidelines to ensure stable operation.
Analysis ID: 8975-C99B000
Based on part parameters and for reference only. Not to be used for procurement or production.
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