Patent ID: 8026616

Claim:
A semiconductor package comprising: a substrate having a first surface and a second surface; a semiconductor chip mounted on the first surface of the substrate; at least one land disposed on the second surface of the substrate, and whose circumference includes a plurality of first group arcs; a mask layer covering the second surface of the substrate and including at least one opening that exposes the at least one land; and at least one external terminal disposed on the at least one land, wherein a portion of the at least one land is covered by the mask layer, and a sidewall of another portion of the at least one land is exposed by the at least one opening, and the circumference of the at least one opening includes a plurality of second group arcs, and a radius of the outermost arc from among the plurality of first group arcs is equal to a radius of the outermost arc from among the plurality of second group arcs.