The M93S66-WMN6TP is an EEPROM integrated circuit manufactured by STMicroelectronics. It is a 128 Kbit Serial SPI Bus EEPROM designed for use from 2.5V to 5.5V. The device has a serial input/output protocol interface and provides non-volatile storage of up to 128 kilobits of data. It offers Byte/Page/Sequential Write and Random Read capabilities. In addition to its power-saving technology, the device’s energy protects data against loss. This device is waterproof and features a typical endurance greater than 1 million write/erase cycles. It is suitable for a variety of industrial, commercial, automotive, and consumer applications, such USB token, smart card, authentication system, and others.