Patent ID: 7147447

Claim:
An apparatus for packaging a semiconductor device of planar top area and side areas, comprising: a mold having top and bottom portions to form a cavity for holding a semiconductor chip pre-assembled on a planar substrate; the bottom mold portion constructed to accommodate the substrate; the top mold portion having a center die to define the planar top area of the package, and side dies to rest on the substrate and to define the planar side areas of the package; a gap separating the center die from the side dies, the gap having a width; protruding members along the perimeter of the center die, the members extending toward the cavity and having a height approximately equal to the width of the gap; and protrusions of the side die to enlarge the resting area against the substrate, the protrusions at a plurality of selected die locations so that the die can clamp the substrate more forcefully against the bottom mold portion during the packaging process.