This part is a kind of semiconductor called DS2431-A1.

Function of this product has 1-Wire EEPROM.

Manufacturers : Maxim Integrated

Image and pinout :

Some of the text within the PDF file :

DS2431-A1 Rev 1; 3/08 1024-Bit, 1-Wire EEPROM for Automotive Applications General Description The DS2431-A1 is an AEC-Q100 Grade 1 qualified version of the DS2431. The logical behavior of both versions is identical. The DS2431-A1 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS2431-A1 communicates over the single-conductor 1-Wire bus. The communication follows the standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into [ ... ]

DS2431-A1 PDF Datasheet Download