The acquisition of Semicoa reduced the number of SST makers from three to two. The US DOJ wants Microsemi to sell off all of Semicoa's assets.
The Sydney Morning Herald has more here.
The antitrust lawsuit filed Thursday claims that Irvine, Calif.-based Microsemi created a monopoly on parts called small signal transistors, which amplify electrical signals, when the company bought Semicoa in July.
The government also argues that the performance and price of other parts called ultrafast recovery rectifier diodes, which also help control the flow of electric current, will suffer because the deal reduced the number of competing firms for those parts from three to two.
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