Package structure to enhance yield of TMI interconnections

摘要

An apparatus is described that includes a substrate and a mold compound disposed on the substrate. The semiconductor die is embedded within the mold compound and is electrically coupled to lands on the substrate. Solder balls are disposed around the semiconductor die on the substrate. Each of the solder balls have a solid coating thereon. The solid coating contains a cleaning agent to promote its solder ball's coalescence with another solder ball. Respective vias are formed in the mold compound that expose the solder balls and their respective solid coatings. In combined or alternate embodiments outer edges of the mold compound have smaller thickness than regions of the mold compound between the vias and the semiconductor die. In combined or alternate embodiments micro-channels exist between the solder balls and the mold compound.

主权项

1. An apparatus, comprising:
a substrate; a mold compound disposed on the substrate; a semiconductor die embedded within the mold compound and electrically coupled to lands on the substrate; solder balls disposed around the semiconductor die on the substrate, the solder balls each having a respective solid coating thereon, the solid coating containing a cleaning agent to promote the solder balls' respective coalescence with other solder balls, wherein, an active potential of the cleaning agent does not appreciably decay during extended storage of the apparatus between construction of the apparatus and a reflow of the solder balls so that the solder balls will coalesce during the reflow with the other solder balls, the other solder balls being components of a packaged semiconductor die when the apparatus is attached to the packaged semiconductor die to form a package-on-package structure; respective vias formed in the mold compound that expose the solder balls and their respective solid coatings.