Original Part
Alternative Part
1. Substitution Conclusion for 24AA64T-I/ST
The 24AA64T-I/ST can directly replace the BR24S64FV-WE2, as both are fully compatible in core specifications. The only differences lie in package marking (TSSOP vs. SSOP, with identical physical dimensions) and the manufacturer. Key parameters such as memory capacity (64 Kbit), interface (I²C at 400 kHz), operating voltage range (1.7 V to 5.5 V), and write cycle time (5 ms) are identical. Therefore, electrical and functional performance will remain unchanged after substitution. Only supply chain and cost considerations between Microchip and Rohm need to be noted.
2. Substitution Conclusion for 24FC64-I/ST
The 24FC64-I/ST is functionally capable of replacing the BR24S64FV-WE2, but compatibility differences must be evaluated. The main variations are in clock frequency (1 MHz vs. 400 kHz) and access time (400 ns vs. unspecified, typically around 900 ns). The 24FC64-I/ST offers higher I²C communication speed, which provides better performance in high-speed applications. However, if the original host controller only supports 400 kHz or has insufficient timing margin, direct substitution may cause communication failure. Before replacing, verify whether the host supports 1 MHz mode or can properly drive the device at 400 kHz (downward compatibility is typically possible). Other parameters such as voltage range, package, and write time are consistent.
Analysis ID: B88C-BFA1000
Based on part parameters and for reference only. Not to be used for procurement or production.
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