Patent ID: 6670550
Filing Date: 2003-12-30
Classification: H01L

Abstract:
A semiconductor die assembly having a semiconductor die and a portion of a lead frame comprising:a semiconductor die having an active surface having a plurality of bond pads thereon and having a plurality of sides forming an outer edge of said semiconductor die; at least two adhesive segments, each adhesive segment having an outer edge and an inner edge, said each adhesive segment secured to a portion of said active surface of said semiconductor die having said outer edge of at least one of said at least two adhesive segments located relatively closer to said outer edge of said semiconductor die and having said inner edge thereof relatively further from said outer edge of said semiconductor die and located on said portion of said active surface of said semiconductor die; a portion of a strip of lead frames, each portion of said strip of lead frames including a plurality of lead members connected to said portion of said strip of lead frames, said plurality of lead members extending inwardly from said portion of said strip of lead frames and over a portion of said active surface of said semiconductor die, at least one lead member of said plurality of lead members having an inner lead end portion at its inner end, having a length and having a thickness, extending over said each adhesive segment being secured thereto, and having a free portion thereof extending beyond said outer edge of said each adhesive segment and over a portion of said active surface of said semiconductor die, causing a gap to be formed between said extending free portion of said at least one lead member and said active surface of said semiconductor die, said gap extending outwardly from said inner edge of said each adhesive segment to said outer edge of said semiconductor die; a plurality of wires, each of said plurality of wires having one end thereof bonded to at least one of said plurality of lead members connected to said portion of said strip of lead frames and another end thereof bonded to at least one of said plurality of bond pads on said active surface of said semiconductor die; an underfill material substantially free of filler material filling said gap formed between said active surface of said semiconductor die and said extending free portion of said at least one lead member of said plurality of lead members and extending outwardly from said outer edge of said each adhesive segment only to said outer edge of said semiconductor die, said underfill material preventing flow of encapsulant material into said gap; and an encapsulant material encapsulating portions of said semiconductor die and said plurality of lead members, said encapsulant material including at least one of a material substantially free of abrasive particles, an epoxy resin, and an acrylic resin.