1. BR24T64FVM-WTR Substitution Conclusion From a core electrical parameter standpoint, the BR24T64FVM-WTR presents a high degree of direct substitution feasibility for the 24AA64T-E/MS. Their key specifications are identical, including the 64Kbit density, I²C interface, 400kHz clock frequency, and 5ms write time. The differences are as follows: firstly, the BR24T64FVM-WTR offers a marginally wider lower operating voltage limit (1.6V vs. 1.7V), granting it slightly better compatibility in battery-powered or low-voltage systems. Secondly, there is a minor discrepancy in package width (2.80mm vs. 3.00mm). This necessitates a re-evaluation of PCB layout compatibility and may require modifications to the existing pad design. Provided the new package can be successfully mounted and soldered onto the existing PCB, and assuming the system has no stringent requirements on access time (a parameter not explicitly specified for the BR24T64FVM-WTR, though variations among I²C EEPROMs in this regard are typically negligible), the Rohm device can serve as a functional replacement. Prior to formal substitution, it is strongly recommended to conduct comprehensive soldering, electrical, and reliability verification within the target circuit and operating environment.