UMC has said it will add 20k wpm of 28nm capacity so long as customers pay up-front and guarantee orders at a set price. The addition would be made at UMC’s Tainan fab. The cost would lift UMC’s 2021 capex by 53% to $2.3 billion. Calling  it an “innovative, win-win” arrangement, UMC CEO Jason Wang ...

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