The HB52RF649DC, HB52RD649DC are a 64M x 72 x 2 banks Synchronous Dynamic RAM Small Outline Dual In-line Memory Module (S.O.DIMM), mounted 18 pieces of 256M bits SDRAM sealed in TCP package and 1 piece of serial EEPROM (2k bits) for Presence Detect (PD). An outline of the products is 144-pin Zig Zag Dual tabs socket type compact and thin package. Therefore, they make high density mounting possible without surface mount technology. They provide