1. BR24T64FVM-WTR Substitution Conclusion Based on core specifications and functionality, the BR24T64FVM-WTR can serve as a viable substitute. However, two key differences require attention. First, its operating voltage range of 1.6V–5.5V is wider than the original part's 2.5V–5.5V. This makes it compatible with lower voltage systems (e.g., 1.8V logic), offering greater adaptability in battery-powered or low-voltage applications. Second, while both use an 8-MSOP package, there is a slight width discrepancy: the BR24T64FVM-WTR measures 2.80mm versus 3.00mm for the original. PCB footprint compatibility must be verified; an existing layout designed for 3.00mm may require modification. All other critical parameters—including 64Kbit density, I2C interface, 400kHz frequency, and 5ms write cycle time—are identical. Therefore, if the system's voltage requirements align and the package footprint is compatible, this device can be considered a valid replacement.