Patent ID: 8803300
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A method of manufacture of an integrated circuit packaging system comprising: forming a lead-frame having a die attach paddle and a contact pad adjacent the die attach paddle, the die attach paddle and the contact pad connected by a link; mounting an integrated circuit die over the die attach paddle; forming a protrusion at a peripheral edge of the die attach paddle and an exposed edge about the contact pad by etching away the link between the contact pad and the die attach paddle, and forming a paddle recess in a bottom of the die attach paddle by partially etching a portion of the bottom of the die attach paddle spaced away from the peripheral edge of the die attach paddle; molding a package body on the lead-frame and the integrated circuit die, including portions of the die attach paddle and the contact pad, the package body having an exposed bottom between the die attach paddle and the contact pad leaving the protrusion and the exposed edge exposed from the package body, and portions of the die attach paddle and the contact pad exposed and extending below the package body; and depositing a solder-resistant layer on the protrusion, the exposed edge, and in the paddle recess, but not on bottoms of the lead-frame under the die attach paddle or the contact pad or the exposed bottom of the package body, the solder-resistant layer consists of an oxide of metal.