A semiconductor device includes: a chip having at least one electrically conductive contact at a first side of the chip; an extension layer extending laterally from one or more sides of the chip; a redistribution layer on a surface of the extension layer and the first side, and coupled to the contact; an interposer having at least one electrically conductive contact at a first surface of the interposer and coupled to the redistribution layer, and at least one electrically conductive contact at a second surface of the interposer opposite to the first surface; a molding material at least partially enclosing the chip and the redistribution layer, and in contact with the interposer. Another semiconductor device includes: an interposer; a redistribution layer over the interposer; a circuit having first and second circuit portions, wherein the redistribution layer includes the first circuit portion, and the interposer includes the second circuit portion.