The STMicroelectronics M24C64-WDW6TP is a 64 Kbit serial EEPROM with an I²C interface, organized as 8 K × 8 bits.
NRND – what that means for a BOM line
That means STMicroelectronics is not actively promoting it for new projects, though it remains available for existing production runs through the independent distribution channel. For a new design, a pin-compatible alternative within the same M24C64 family should be evaluated; the base product number M24C64 covers multiple package and tape variants that share the same I²C interface and 64 Kbit density.
The 450 ns access time and 1 MHz clock rate are adequate for configuration storage, calibration tables, and firmware parameter recall where the bus is not the throughput bottleneck.