Image Number 12 for United States Patent #8482134.
A stackable package is placed within a mold during an encapsulation operation. A compliant surface, e.g., of a compliant film, of the mold is pressed down on upper interconnection balls of the stackable package to force upper portions of the upper interconnection balls into the mold. However, lower portions of the upper interconnection balls are exposed within a space between the compliant surface and a substrate of the stackable package. The space is filled with a dielectric material to form a package body. The package body is formed while at the same time exposing the upper portions of upper interconnection balls from the package body in a single encapsulation operation. By avoiding selective removal of the package body to expose the upper interconnection balls, the number of operations as well as cost to manufacture the stackable package is minimized.