The STMicroelectronics M93C66-WMN6P is an electronically erasable programmable read-only memory (EEPROM). It is a non-volatile memory in the form of a 8-pin SO8 package with a 512 x 8bit wide storage. It has an operating voltage of 2.5 to 5.5V and uses the Microwire serial data bus. It is used for memory storing and data protection applications, allowing parallel or serial data access via MOSI (master output slave input) and MISO (master input slave output) lines. It is suitable for automotive applications and small form-factor applications.