onsemi CAT24C512HU5IGT3, 512kbit Serial EEPROM Memory, 400ns 8-Pin UDFN-8 Serial-I2C

The ON Semiconductor EEPROM serial 512-Kb memory is using I2C interface which is internally organized as 65,536 words of 8 bits each. It support the standard (100 kHz), fast (400 kHz) and fast-plus (1 MHz) I2C protocol. It has a low power CMOS technology.

Hardware write protection for entire memory
1,000,000 program/erase cycles
It has 100 year data retention