1. M24C64-DRDW3TP/K Substitution Conclusion In terms of core functionality, package, and electrical interface, the M24C64-DRDW3TP/K can directly replace the BR24G64FVT-5E2. Both are 64Kbit I2C EEPROMs (organized as 8K x 8, 1MHz clock, 8-TSSOP package). However, three key differences exist. First, the operating voltage ranges differ. The original part supports 1.6V to 5.5V, while the substitute is rated for 1.8V to 5.5V. If the system operates below 1.8V (e.g., within the 1.6V to 1.8V range), the substitute may not function correctly. Second, the substitute offers a slight advantage in write cycle time—4ms versus 5ms for the original—which can improve data write efficiency. Third, the substitute is AEC-Q100 automotive-grade qualified (not specified for the original), making it more reliable for demanding automotive or industrial environments. In summary, the substitution is fully viable if the system voltage consistently remains above 1.8V and does not rely on operation down to 1.6V. In such cases, the replacement could even offer benefits in reliability and write speed. Otherwise, careful evaluation of low-voltage compatibility is required.