Patent ID: 9698027
Date: 2017-07-04
CPC Classifications: H01L

Claim:
1. A method of making an integrated circuit comprising: providing an electrically conductive base member comprising opposing front and back surfaces, the base member comprising a die attachment portion and a lead frame portion; forming, at the lead frame portion of the base member, a set of holes opening at the front surface of the base member, the front surface of the base member at the lead frame portion comprising wire bonding locations, a subset of the set of holes being formed around each of the wire bonding locations; attaching an integrated circuit to the front surface of the base member at the die attachment portion; forming wire bonds between the integrated circuit and the wire bonding locations; molding an electrically insulating package molding compound onto the front surface of the base member so that the integrated circuit and the wire bonds are embedded in the package molding compound with the package molding compound penetrating into the set of holes opening at the front surface of the base member, the package molding compound comprising a first major surface covering the integrated circuit and an opposite second major surface under the integrated circuit; and selectively etching the base member from the back surface thereof to define residual portions of the base member at the wire bonding locations, the residual portions being surrounded by columnar formations of the package molding compound which penetrate into the set of holes, wherein the columnar formations and the residual portions under the wire bonding locations protrude away from the second major surface of the package molding compound.