Original Part
Alternative Part
1. 24AA64T-E/ST Substitution Conclusion
The 24AA64T-E/ST can serve as a functional replacement for the AT24CS64-XHM-T, with two key performance degradations to note: its I²C clock frequency is limited to 400 kHz (vs. 1 MHz for the original part), reducing maximum communication speed by up to 60% and potentially impacting data write/read throughput; additionally, its access time is 900 ns (vs. 550 ns for the original part), increasing response latency by approximately 64%—systems sensitive to high-speed read operations should evaluate timing compatibility. All other core parameters (density, interface, voltage range, package, and write cycle time) are identical. If the system does not demand high communication rates and has sufficient timing margin, direct substitution is viable.
2. BR24S64FV-WE2 Substitution Conclusion
The BR24S64FV-WE2 can functionally replace the AT24CS64-XHM-T, but three differences should be considered: first, the clock frequency is limited to 400 kHz (vs. 1 MHz for the original part), significantly reducing communication bandwidth; second, there may be subtle differences in low-level driver behavior between Rohm and the original manufacturer (Microchip), such as in address recognition or protocol fault tolerance, requiring software compatibility verification; third, while the package is 8-LSSOP (with the same pin pitch as TSSOP), the exact mechanical dimensions and pad layout should be checked for PCB layout compatibility. If the system is not speed-sensitive and passes hardware compatibility testing, this device can be considered an alternative substitute.
Analysis ID: 4D4E-D1C4000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com