Flex printed circuits, Rigid-flex and HDI flexible circuits at Flex Interconnect Technologies flex circuit , flexible circuit, rigid flex, HDI circuit, manufacturer, flexible PCB, flex interconnect technologies, FIT, silicon valley, milpitas, san jose, california Flex Interconnect Technologies is a leading flex circuit, rigid flex and HDI flexible circuit manufacturer located in Silicon Valley, serving the High-End Computer, Medical, Defense, Aerospace, Semiconductor and Automotive industries.