Patent ID: 8643163

Claim:
An integrated circuit package-on-package stacking system comprising: a first integrated circuit package having a first substrate and a first integrated circuit formed on the first substrate; a metalized interposer substrate of flexible tape over the first integrated circuit package; a stiffener integrated with the metalized interposer substrate thinner than the first substrate whereby the stiffener provides structural integrity and mitigates structural deformation, the stiffener having an extension along an outer edge of the metalized interposer substrate or the first substrate, the extension operable to cover at least a portion of the outer edge of the metalized interposer substrate or the first substrate; a second integrated circuit package directly on the metalized interposer substrate and supported only by the metalized interposer substrate; and a transition interconnect on the first integrated circuit package, the transition interconnect, entirely and directly below the stiffener, exposed between the first substrate and the metalized interposer substrate.