The AT25040B-SSHL-B is a 4 kbit Serial EEPROM from Microchip. It is a non-volatile memory device which can store up to 8 pages of 8-bit data. It features a versatile 2-wire serial interface and is capable of working at a wide range of supply voltages, from 2.7 V to 5.5 V. It also features a large number of pre-programmed status registers, allowing users to tailor the behavior of the device to their needs. The data can also be write-protected, to prevent accidental or malicious changes to the contents. The device also offers up to 2 kb of page erase and page write protection, allowing data to be stored securely.