Patent ID: 7598122
Filing Date: 2009-10-06
Classification: H01L

Abstract:
1. A method of packaging a semiconductor die using a microarray leadframe having an array of contact posts suitable for forming contact pads, a die attach structure and a plurality of lead traces, the posts being arranged in a plurality of rows and each lead trace being integrally formed with an associated contact post and the die attach structure being integrally formed with at least one associated contact post, the method comprising: stamping an adhesive onto discrete areas of the microarray leadframe using a multi-pronged stamp tool, wherein the adhesive is applied to a surface of the microarray leadframe that faces away from bottom surfaces of the contact posts as a series of dots, each dot corresponding to an associated prong of the stamping tool, wherein at least some of the adhesive dots are placed on lead trace portions of the microarray leadframe and at least some other of the adhesive dots are placed on the die attach structure of the microarray leadframe and wherein no prong of the stamping tool applies more than one adhesive dot; attaching a die to the microarray leadframe using the adhesive; electrically connecting the die to the leadframe; and forming an encapsulant cap over the leadframe and die while leaving bottom, surfaces of the contact posts exposed to provide electrical contacts for the packaged die, wherein the encapsulant cap is formed such that encapsulant material is exposed on a bottom surface of the package between the exposed contact posts; wherein: top surfaces of the lead traces are substantially co-planar with a top surface of the leadframe; bottom surfaces of the lead traces are recessed relative to a bottom surface of the leadframe; bottom surfaces of the contact posts are substantially co-planar with the bottom surface of the leadframe; and wherein at least some of the lead traces extend beyond their associated contact posts on two opposing sides of their associated contact posts and have a width in an overlying region of their associated contact post that is narrower than their associated contact post.