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What are the flatness requirements to the silicon wafer in order to enable good solder transfer?

April 26, 2017enable flatness good requirements Silicon solder transfer wafer

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What are the flatness requirements to the silicon wafer in order to enable good solder transfer?

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The flatness specification for the wafer is approximately 250um. The wafer is handled via a vacuum chuck and thus flattened during the solder transfer step.