Abstract
The panel-level redistribution-layer (RDL)-first fan-out packaging for hybrid substrate is studied. Emphasis is placed on the process, materials, design, and fabrication of: 1) heterogeneous integration of one large chip and one small chip with 50-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> pitch (minimum); 2) fine metal linewidth and spacing RDL-first substrate on a temporary panel carrier; 3) ordinary build-up package substrate on a panel; 4) hybrid substrate which is by soldering the RDL-first substrate on the build-up substrate; and 5) chips to hybrid substrate bonding and underfilling. Reliability assessment by thermomechanical simulation includes thermal cycling of the heterogeneous integration of the two-chip package on the hybrid substrate that is performed by a nonlinear temperature- and time-dependent finite-element analysis.
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