The STMicroelectronics M24C04-WDW6T is a 4Kbit serial EEPROM organized as 512 x 8 bits, accessed through an I2C interface running at 400 kHz.
The M24C04-WDW6T carries an official obsolete status. STMicroelectronics no longer manufactures this specific tape-and-reel variant. If you are qualifying a replacement, the M24C04 family includes several active I2C EEPROMs in the same 8-TSSOP footprint with identical pinout and 4Kbit density; verify the supply voltage and clock frequency match your design. The 5 ms write cycle time (word or page) is standard for this generation and carries over to any drop-in replacement.
Because the M24C04-WDW6T is obsolete, it is not available through the standard authorized-distributor channel. If your BOM needs this exact order code for a legacy board repair or a last-time-buy top-up, submit an RFQ and we will locate material that meets the original ST specification.