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SJ Semiconductor Corp. (SJSemi) was established in August 2014 in Jiangyin, China. SJSemi is the first pure-play MEOL(Middle-End of Line) Foundry which adapted and implemented Front-End wafer manufacturing and quality system in China for global services. SJSemi's main business is on bumping, Cu pillar, RDL and Testing for 12" wafers. The company also places heavy RD emphasis on Fan-out, TSV and 3D technologies.