Patent ID: 7112252
Filing Date: 2006-09-26
Classification: H01L,Y10T

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