Retaining ring interconnect used for 3-D stacking

摘要

A retaining ring interconnect. A retaining ring is formed on a perimeter of a pad on each of two adjoining surfaces of two PCB substrates. A conductive paste is applied between the pads on the two adjoining surfaces. The retaining rings are aligned and facing with each other. By performing a heat compression process, the retaining rings are connected to encompass the conductive paste. A eutectic bond is thus formed to bond the two PCB substrates.