Original Part
Alternative Part
1. ADM1485ARZ-REEL Substitution Conclusion
Direct substitution is not feasible. The most critical barrier is supply voltage incompatibility: the original part, SP3485CN, is a 3.3V device (3V to 3.6V), whereas the ADM1485ARZ is a 5V device (4.75V to 5.25V). Direct replacement would result in the original 3.3V system being unable to drive or potentially damaging the substitute IC. Furthermore, the ADM1485ARZ offers significant performance enhancements, including a data rate of 30 Mbps, which far exceeds the SP3485's 10 Mbps, and a receiver hysteresis of 70 mV—3.5 times that of the original part (20 mV). This provides substantially improved noise immunity and signal integrity in electrically noisy industrial environments. However, these performance advantages are only meaningful if the system operates at a compatible voltage and can support the higher signaling rate.
2. ADM1485ARZ-REEL7 Substitution Conclusion
Direct substitution is not feasible. The ADM1485ARZ-REEL7 and ADM1485ARZ-REEL are the same die in different reel packaging (Reel7 denotes a 7-inch reel). Consequently, their core electrical parameters are identical, and the same fatal supply voltage mismatch exists (5V vs. 3.3V), making it unsuitable for circuits designed for the original 3.3V system. Its higher data rate (30 Mbps) and stronger hysteresis (70 mV) represent notable technical advantages. However, realizing these benefits requires the target system to be based on a 5V supply and feature corresponding high-speed signal layout practices. Otherwise, these advantages remain unrealized, with the voltage mismatch being the primary and insurmountable obstacle to substitution.
Analysis ID: 5FA7-B045000
Based on part parameters and for reference only. Not to be used for procurement or production.
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