AT24C04A/P I2C-Compatible, (2-wire) Serial EEPROM by Microchip. Package: 8-DIP Organisation: 512 x 8-bit These are simple and fun to program... and cheap ! Download ATMEL AT24C04 datasheet: Status: NOS ( New Old Stock) Individually tested compoinents: YES (Checked as unprogrammed and ready to go ) RoHS compliant: tbc