1. BR25G640FVT-3GE2 Substitution Conclusion Based on a comparison of core specifications and technical parameters, the BR25G640FVT-3GE2 can serve as a direct replacement for the M95640-RDW6TP. All key specifications are identical, including memory capacity (64Kbit), organization (8K x 8), interface (SPI), speed (20MHz), page write cycle time (5ms), and package (8-TSSOP). This ensures compatibility in electrical connections and basic functionality. The primary difference lies in the operating voltage range. The original part supports 1.8V to 5.5V, whereas the substitute extends the lower limit to 1.6V. The BR25G640FVT-3GE2 offers broader power supply adaptability, making it particularly suitable for ultra-low-power or battery-powered applications with lower voltage thresholds. It operates in the 1.6V to 1.8V range where the original component cannot function. Substitution is entirely feasible from a hardware perspective in the vast majority of systems operating at 1.8V and above. However, if a new design intends to leverage its 1.6V low-voltage capability, it is critical to verify that the entire system's power supply and signal levels remain stable and reliable at this lower voltage.