The CAT24C128WI-GT3 is a 128K-bit Serial CMOS EEPROM (Electrically Erasable Programmable Read Only Memory) device from ON Semiconductor. This device uses I2C (Inter-Integrated Circuit) serial interface to access the data it stores. It features a 2-wire interface, low power consumption, and fast write operations. The device operates from a single +5V logic supply and can store up to 128K-bits of data in a single device. The device can be read and written byte by byte, and features a write-protect pin to protect stored data from inadvertent alteration. The CAT24C128WI-GT3 is a reliable, low-cost, non-volatile memory device ideal for a variety of applications including: consumer products, portable electronics, industrial equipment, system monitoring and control, and data logging.