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    Breaking News

    Imec, Cascade Microtech Develop First Automatic Probe System for Advanced 3D Chips

    Test system enables pre-bond probing of 3D chips with large-array fine-pitch micro-bumps.

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    05.25.17
    Imec and Cascade Microtech, a FormFactor company and a leader in advanced wafer-probe solutions, announced the successful development of a fully-automatic system for pre-bond testing of advanced 3D chips.
     
    Pre-bond testing is important to increase the yield of 3D stacked chips. The new system enables probing and hence testing of chips with large arrays of 40µm-pitch micro-bumps, on 300mm wafers. The relevance of this new tool is underlined by winning the 2017 National Instruments Engineering Impact Award.
     
    As an emerging technology, 3D IC stacking still has many open options and technical challenges. One of these challenges is probing of the individual chips, before being stacked, to ensure a good yield of the 3D stacked ICs. The inter-chip connections of 3D stacked ICs are made by large arrays of fine-pitch micro-bumps, which makes probing these bumps a challenge. Until today, the probing solution is to add dedicated pre-bond probe pads to the to-be-stacked dies, but this requires extra space and design effort and increases test time.
     
    Imec and Cascade Microtech have now developed a fully automatic test cell that can provide test access by probing large arrays of fine-pitch micro-bumps. The system is based on a Cascade Microtech CM300 probe station and National Instruments PXI test instrumentation. The system allows testing of wafers up to 300mm diameter, including thinned wafers on tape frame with exposed through-silicon vias. After several years of collaboration between imec and Cascade Microtech, partly supported by the EU-funded FP7 SEA4KET project, good results were achieved with Cascade Microtech’s Pyramid Probe prototype RBI probe cards on imec’s 300mm wafers with 40µm-pitch micro-bumped chips.
     
    “As everything in the semiconductor realm, also micro-bumps are subject to downscaling,” said Erik Jan Marinissen, principal scientist at imec. “Hence, with Cascade, we have started experiments to also probe our 20µm-pitch micro-bump arrays, and those look promising.”
     
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