This part is a kind of semiconductor called AT24C04A.

Function of this product has 2-Wire Serial EEPROM.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

Features • Write Protect Pin for Hardware Data Protection – Utilizes Different Array Protection Compared to the AT24C02/04 • Low-voltage and Standard-voltage Operation – 2.7 (VCC = 2.7V to 5.5V) – 1.8 (VCC = 1.8V to 5.5V) • Internally Organized 256 x 8 (2K), 512 x 8 (4K) • Two-wire Serial Interface • Schmitt Trigger, Filtered Inputs for Noise Suppression • Bidirectional Data Transfer Protocol • 100 kHz (1.8V) and 400 kHz (2.5V, 2.7V, 5V) Clock Rate • 8-byte Page (2K), 16-byte Page (4K) Write Modes • Partial Page Writes Allowed • Self-timed Write Cycle (5 ms Max) • High Reliability – Endurance: One Million Write Cycles – Data Retention: 100 Years • Automotive Grade, Extended Temperature and Lead-Free/Halogen-Free Devices Available • 8-lead PDIP, 8-lead JE [ ... ]

AT24C04A PDF Datasheet Download