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SLIM Packages have built-in vertical connections to the top surface of the package for package-on-package ( PoP ) stacking using high-precision cavity embedding of thin silicon and gallium arsenide (GaAs) devices into ultra-thin organic
applications have combined to push FC CSP mechanical performance – thinner phones, and package-on-package ( POP ) stacking . Figure 1 shows the stack height of an FC CSP package is limited to its ball, substrate, and silicon thickness