1. ADM3485EARZ Substitution Conclusion The ADM3485EARZ is not a direct drop-in replacement for the SN75HVD1176D. Significant differences exist in key electrical parameters, and substituting the former without modifying the system design will result in system failure or severely degraded reliability. The primary differences are as follows: First, supply voltage—the SN75HVD1176D operates from a single 5 V supply, whereas the ADM3485EARZ requires 3.3 V. Power rails and logic-level interfaces originally designed for 5 V must be adjusted accordingly; otherwise, device damage or communication failure will occur. Second, data rate—the SN75HVD1176D supports up to 40 Mbps, while the ADM3485EARZ is limited to 10 Mbps. This directly restricts communication bandwidth; if the original system operates above 10 Mbps, communication will fail after substitution. Third, receiver hysteresis differs slightly but is not a critical limitation. Feasibility of substitution depends entirely on whether the target application can accept the lower 3.3 V operating voltage and the 10 Mbps rate ceiling, and whether a board redesign is acceptable.