Microchip 25AA040AT-I/MC is a 4Kb Serial EEPROM. It is an 8-pin device and provides a storage capacity of 4,128 bits. It features an SPI or I2C interface, low power consumption and its 2.5V operation make it ideal for power-sensitive applications. The 25AA040AT-I/MC is a powered by a 3V lithium battery or 2.5V to 5.5V power supply. Its external communication is 4-wire interface with up to 4 MHz operating frequency. It is ideal for data storage applications and other applications where nonvolatile memory is required. It offers high reliability and long data retention. The 25AA040AT-I/MC has a wide temperature range from -40°C to +125°C.