| abstract |
A semiconductor device with a sheet-like insulating substrate ( 101 ) integral with two or more patterned layers of conductive lines and vias, a chip attached to an assembly site, and contact pads ( 103 ) in pad locations has an encapsulated region on the top surface of the substrate, extending to the edge of the substrate, enclosing the chip, and having contact apertures ( 703 ) at the pad locations for external communication with the pad metal surfaces. The apertures may have not-smooth sidewall surfaces and may be filled with solder material ( 704 ) to contact the pads. Metal-filled surface grooves ( 710 ) in the encapsulated region, with smooth groove bottom and sidewalls, are selected to serve as customized routing interconnections, or redistribution lines, between selected apertures and thus to facilitate the coupling with another semiconductor device to form a package-on-package assembly. |