Provided are a semiconductor device using, for example, an epoxy molding compound (EMC) wafer support system and a fabricating method thereof, which can, for example, adjust a thickness of the overall package in a final stage of completing the device while shortening a fabricating process and considerably reducing the fabrication cost. An example semiconductor device may comprise a first semiconductor die that comprises a bond pad and a through silicon via (TSV) connected to the bond pad; an interposer comprising a redistribution layer connected to the bond pad or the TSV and formed on the first semiconductor die, a second semiconductor die connected to the redistribution layer of the interposer and positioned on the interposer; an encapsulation unit encapsulating the second semiconductor die, and a solder ball connected to the bond pad or the TSV of the first semiconductor die.