Abstract: A leadframe for a semiconductor package is disclosed including electrical leads which extend from one side of the leadframe to an opposite side of the leadframe, where electrical connection may be made with the semiconductor die at the second side of the leadframe. The semiconductor die may be supported on the leads extending across the leadframe. The package may further include a spacer layer affixed to the electrical leads to fortify the semiconductor package and to prevent exposure of the electrical leads during the molding of the package.

Abstract: A dummy circuit pattern is disclosed on a surface of a substrate for a semiconductor package. The dummy circuit pattern includes a plurality of straight line segments and a plurality of interrupt patterns to breakup one or more of the straight line segments. The interrupt patterns are provided so as to not electrically isolate areas of the dummy pattern, thus providing electrical continuity across the dummy circuit pattern.

Abstract: A rigid wave pattern formed on a first side of a substrate in a semiconductor die package. The rigid wave pattern aligns with and overlies the contact fingers formed on the second side of the substrate. When the substrate and dice are encased during the molding process, the rigid wave pattern effectively reduces deformation of and stresses on the dice, therefore substantially alleviating die cracking.