The STMicroelectronics M24C64-WMN6T is a 64 Kbit serial EEPROM with an I2C interface, organized as 8 K x 8 bits. The part is packaged in an 8-pin SOIC (3.90 mm body width) for surface-mount assembly.
STMicroelectronics no longer manufactures this specific variant in production volumes. There is no LTB window to chase — the discontinuation has already taken effect.
At 2.5 V the I2C bus timing still meets the 1 MHz clock spec, though the 450 ns access time is measured at the full supply — expect slightly longer read cycles at the low end. Storage temperature exceeds this range, but the device is not rated for continuous operation beyond 85°C ambient.
I2C bus timing and write-cycle budget
The 1 MHz I2C clock is the fast-mode plus rate, giving a theoretical 125 KB/s read throughput. The 450 ns access time is the random-read latency from the address byte to the first data byte — this matters for time-critical polling loops. Write-cycle time is 5 ms per page or word, so a full 64 Kbit rewrite takes roughly 320 ms if you page-write 16 bytes at a time. Budget that into your firmware state machine; the device does not acknowledge its own slave address during the internal write cycle.