Original Part
Alternative Part
1. BR24S64FVJ-WE2 Substitution Conclusion
The BR24S64FVJ-WE2 matches the original part 24AA64T-E/MS in all key parameters—64Kbit density, 8K×8 organization, I2C interface, 400kHz clock frequency, 1.7V–5.5V wide supply voltage, and 5ms write cycle time—and is package-compatible (both in 8-TSSOP/MSOP with 3.00mm body width). This makes it a viable drop-in replacement. The only noted discrepancy is that the original part specifies a 900ns access time, while the Rohm datasheet does not explicitly list this parameter. In practice, however, the access speed of I2C EEPROMs is primarily governed by the clock frequency; since both devices support the 400kHz standard mode, this difference typically does not affect functional compatibility. For systems with extremely stringent read timing requirements, it is recommended to verify the AC characteristics of the Rohm device.
2. BR24G64FVM-3AGTTR Substitution Conclusion
The BR24G64FVM-3AGTTR shares the same basic specifications as the original part in terms of density, organization, and operating voltage range. However, two key differences exist: its clock frequency is increased to 1MHz (compared to 400kHz for the original), and its package width is slightly narrower (2.80mm vs. 3.00mm). The higher clock frequency can improve data transfer throughput, but it requires the host controller to support I2C high-speed mode. If the original system was designed only for 400kHz operation, signal integrity should be verified. The narrower package width may introduce soldering compatibility issues, so PCB pad layout should be checked for fit. If the system supports the higher I2C rate and the mechanical dimensions are acceptable, this device can be considered a performance-upgrade alternative; otherwise, compatibility should be carefully evaluated.
Analysis ID: 0954-5409000
Based on part parameters and for reference only. Not to be used for procurement or production.
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