Patent ID: 8722461

Claim:
A method of making a semiconductor package comprising: a. etching a through pattern in a metal substrate, thereby forming a die attach pad, a first set of contact pads surrounding the die attach pad, a second set of contact pads surrounding the first set of contact pads, and a third set of contact pads between the first set of contact pads and the die attach pad, wherein the first and the second set of contact pads are coupled with a support member that is anchored to the die attach pad by cross members, wherein the support member and the cross members are coplanar, wherein each contact pad of the third set of contact pads includes an anchor bar; b. mounting at least one semiconductor die on the die attach pad; c. mounting bondwires for electrically coupling the at least one semiconductor die to at least one contact pad; d. at least partially encasing the semiconductor die, bondwires and contact pads in a mold compound while leaving one surface of the metal substrate exposed; and e. etching away the support member, thereby electrically isolating the first set of contact pads and second set of contact pads with respect to each other and thereby also forming a groove such that a portion of each anchor bar abuts the groove.