The A3R12E40DBF-AH with FBGA-84 DDR SDRAM ROHS manufactured by Zentel is an electronic component used in memory systems. It has a form factor and a manufacturing technology of FBGA-84. The memory type is DDR SDRAM, which is a type of dynamic random access memory (DRAM). It is RoHS compliant, meaning it is free of hazardous substances such as lead, mercury, and cadmium. The speed is rated at 667 MHz, which allows it to be compatible with a range of computing devices. Additionally, this part has 40-bit organization and a 3.3-volt voltage range. It is designed for use in embedded applications and is typically mounted on a motherboard.