STATS ChipPAC and UMC unveil 3D IC developed under open ecosystem

STATS ChipPAC Ltd. (SGX-ST: STATSChP) and United Microelectronics Corp. (NYSE: UMC; TWSE: 2303) announced the world’s first demonstration of TSV-enabled 3D IC chip stacking technology developed under an open ecosystem collaboration. The 3D chip stack, consisting of a wide I/O memory test chip stacked upon a TSV-embedded 28nm processor test chip, successfully reached a major milestone on package-level reliability assessment.

"The next level of chip integration is rapidly evolving, and 3D IC technology is poised to enable the next frontier of IC capabilities for customers under various deployment models," said Shim Il Kwon, VP of Technology Innovation of STATS ChipPAC.

S.C. Chien, vice president of Advanced Technology Development at UMC, said, "We see no imperative to restrict 3D IC to a captive business model, as UMC’s development work with nearly all the major OSAT partners for 3D IC has been very productive. Our successful collaboration with a leading OSAT partner like STATS ChipPAC has further established the viability of an open ecosystem approach. This model should work especially well for our mutual 3D IC customers, as foundry and OSAT can utilize their respective core strengths during development and delivery, while customers can benefit from keeping supply chain management flexible and realize better transparency over technology access compared to closed, captive 3D IC business models."

Under the 3D IC open development project with STATS ChipPAC, UMC provides the FEOL wafer manufacturing, with a foundry grade fine pitch, high density TSV process that can be seamlessly integrated with UMC’s 28nm poly SiON process flow. The know-how developed will be applied towards implementation on the foundry’s 28nm High-K/metal gate process. For MEOL and BEOL, STATS ChipPAC performs the wafer thinning, wafer backside integration, fine pitch copper pillar bump and precision chip-to-chip 3D stacking.

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