1. BR24T64FVM-WTR Substitution Conclusion A detailed comparison confirms that the BR24T64FVM-WTR can directly replace the 24LC64F-E/MS in core functionality. However, two key differences must be noted. First, it offers a wider operating voltage range (1.6V to 5.5V vs. the original's 2.5V to 5.5V), providing greater compatibility, particularly in low-voltage systems such as 1.8V applications. Second, there is a slight difference in package width (2.80mm vs. 3.00mm). While both are MSOP, the 0.2mm mechanical variance requires verification of PCB pad layout compatibility. All other critical parameters—including memory capacity, interface, timing, and storage architecture—are identical. Therefore, substitution is highly feasible, provided voltage and package compatibility are confirmed.