This part is a kind of semiconductor called A24C256.

Function of this product has 256K (32768 x 8) TWO-WIRE SERIAL EEPROM.

Manufacturers : AiT Semiconductor

Image and pinout :

Some of the text within the PDF file :

AiT Semiconductor Inc. www.ait-ic.com A24C256 TWO-WIRE SERIAL EEPROM 256K (32768 X 8) DESCRIPTION A24C256 provides 262,144 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 32,768 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operations are essential. The A24C256 is available SOP8 and TSSOP8 Package. FEATURES  Two-Wire Serial Interface  VCC=1.8V To 5.5V  Bi-Directional Data Transfer Protocol  Internal Organized A24C256, 32,768 X 8 (256K bits)  400KHz (1.8V, 2.7V & 5V) Compatibility  64-byte Page Write Mode  Partial Page Writes Allowed  Self-Timed Write Cycle (5ms Max)  High-Reliability  1 Million Write Cycles guaranteed  Data [ ... ]

A24C256 PDF Datasheet Download