Patent ID: 8669651

Claim:
A device comprising: a package substrate comprising: a first dielectric layer, wherein the first dielectric layer is the topmost dielectric layer of the package substrate; an under-bump metallurgy (UBM) comprising a first portion extending over a top surface of the first dielectric layer, and a second portion extending into the first dielectric layer; and a first non-reflowable metal bump over the UBM and extending over the top surface of the first dielectric layer; a die over and bonded to the package substrate; a package component over the die and bonded to the package substrate, wherein the package component comprises; an additional device die; and a second non-reflowable metal bump at a surface of the additional device die, wherein the second non-reflowable metal bump extends below a bottom surface of the package component; and a solder bump bonding the first non-reflowable metal bump to the second non-reflowable metal bump.