Original Part
Alternative Part
1. 24LC64F-I/ST Substitution Conclusion
Direct substitution is not recommended. The 24LC64F-I/ST differs in its operating voltage range of 2.5V to 5.5V, while the original part (BR24S64FVT-WE2) supports 1.7V to 5.5V. In low-voltage systems operating between 1.7V and 2.5V—such as those powered by a single cell—the 24LC64F-I/ST will not function or may fail to operate entirely. This constitutes a critical and decisive compatibility difference.
2. 24AA64FT-I/ST Substitution Conclusion
Recommended as a high-feasibility alternative. The 24AA64FT-I/ST aligns closely with the original part (BR24S64FVT-WE2) in key specifications: same 64Kbit capacity (8K × 8), identical I2C interface with 400kHz clock frequency, the same wide voltage range of 1.7V–5.5V, and the same 8-TSSOP package. The only noted deviation is its specified access time of 900 ns, a parameter not explicitly defined for the original device. For I2C EEPROMs, this access time is typically much faster than the bus communication period, so it does not introduce a performance bottleneck or compatibility issue in practical applications. Direct replacement is therefore considered viable.
Analysis ID: 99E9-8B49000
Based on part parameters and for reference only. Not to be used for procurement or production.
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