1. SP1485EEN-L Substitution Conclusion From a functional and package perspective, the SP1485EEN-L serves as a high-performance direct replacement option. It is fully compatible with the original part in terms of package (8-SOIC) and core functionality (half-duplex RS-422/485 transceiver). The key differences are: a significantly higher data rate (20Mbps vs. 1Mbps), a slightly narrower supply voltage range (4.75V to 5.25V vs. 4.5V to 5.5V), and a marginally lower receiver hysteresis (20mV vs. 25mV). The SP1485EEN-L can easily handle the original part's 1Mbps application with substantial headroom, offering superior performance. However, it imposes stricter tolerance requirements on the power supply, necessitating that the system voltage remains above 4.75V. Furthermore, in extremely noisy industrial environments, its slightly lower receiver hysteresis may, in theory, result in a minor reduction in noise immunity, although this impact is negligible for the vast majority of applications. Substitution can be successfully implemented provided the system supply voltage meets its specified requirements.