Patent ID: 6610162
Filing Date: 2003-08-26
Classification: H01L,Y10T

Abstract:
A method of assembling a semiconductor die to a lead frame comprising:providing the lead frame having a plurality of lead members, each lead member of said plurality of lead members having a lead end portion connected to a portion of the lead frame, said each lead member of said plurality of lead members having a length, having a thickness, and having a free end portion; forming a stress relief portion in the plurality of lead members, said stress relief portion extending along the length of each lead member of the plurality of lead members between the free end portion and the lead end portion thereof, said stress relief portion having a predetermined length and depth, said stress relief portion formed by one process of a machining process, an etching process, a process using an electron beam, and a deforming process; providing a die having an active surface, having a plurality of outer edges, having a width, having a length greater than the width, and having a plurality of bond pads extending along a center portion of the active surface along the length of said die, at least one bond pad of the plurality of bond pads for connection to said plurality of lead members; providing adhesive; placing the adhesive continuously without interruption throughout a portion of the active surface of said die extending from adjacent each side of the plurality of bond pads except for a portion of the active surface of said die adjacent the plurality of outer edges of said die from which said plurality of lead members extends from the lead end portion over at least one outer edge of the plurality of outer edges of said die having the free end portion thereof located adjacent the at least one bond pad of the plurality of bond pads; superimposing said lead frame on said die with said active surface facing said lead frame and the plurality of lead members extending over the active surface of said die, said stress relief portion of the plurality of lead members extending from adjacent the at least one outer edge of the plurality of outer edges of said die, extending over a portion of the active surface of said die having no adhesive thereon, and over a portion of the adhesive on a portion of the active surface of said die; securing said plurality of lead members to the portion of the active surface of said die using the adhesive; allowing a portion of said plurality of lead members to be unsecured to the portion of the active surface of said die having no adhesive thereon; providing an area located between the portion of the active surface of said die having no adhesive thereon and the stress relief portion of said plurality of lead members having an enlarged space compared to a space between the portion of the active surface of said die having adhesive thereon and the stress relief portion of said plurality of lead members; and sizing and configuring an area for allowing passage of filler particles of molding material therethrough in a transfer molding operation preventing damage from said filler particles by said transfer molding operation to the portion of the active surface of said die having no adhesive thereon and allowing an increased amount of flexure for movement of said plurality of lead members with respect to said die by allowing passage of said filler particles from said area.