JAPAN'S Sony Corp plans to expand semiconductor output in the US and Japan and boost sales to non-group companies from 50 per cent to 70 per cent over the next two years. A spokesman said Sony would invest US$400 million in expanding production of static random access memory (SRAM) chips in April next year, the same investment as the previous two years. Sony's subsidiary in Texas plans to expand production of six-inch wafers for one and four-megabit SRAM chips from the current 5,000 units a month to 7,000 units over the next two years. The company also plans to install more advanced equipment at its Nagasaki plant which produces SRAM chips as well as microcontrollers and logic integrated circuits. the spokesman said.