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On the Way from Fan-out Wafer to Fan-out Panel Level Packaging
Keywords: Panel Level Packaging, Embedding, System in Package
Fan-out Wafer Level Packaging (FOWLP) is one of the latest packaging trends in microelectronics. The technology has a high potential in significant package miniaturization concerning package volume but also in thickness. Main advantages of FOWLP are the substrate-less package, lower thermal resistance, higher performance due to shorter interconnects together with direct IC connection by thin film metallization instead of wire bonds or flip chip bumps and lower parasitic effects. Especially the inductance of the FOWLP is much lower compared to FC-BGA packages. In addition the redistribution layer can also provide embedded passives (R, L, C) as well as antenna structures using a multi-layer structure. It can be used for multi-chip packages for System in Package (SiP) and heterogeneous integration. Manufacturing is currently done on wafer level up to 12/300 mm and 330 mm respectively. For higher productivity and therewith lower costs larger form factors are forecasted for the near future. Instead of following the wafer level approach to 450 mm, panel level packaging will be the next big step. Sizes for the panel could range up to 18x24 or even larger influenced by different technologies coming from e.g. printed circuit board, solar or LCD manufacturing. However, an easy upscaling of technology when moving from wafer to panel level is not possible. Materials, equipment and processes have to be further developed or at least adapted. An overview of state of technology for panel level packaging will be presented and discussed in detailed.
Tanja Braun, Research Scientist
Fraunhofer IZM
Berlin, Berlin

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