KOA is a manufacturer of passive components and semiconductor devices. Its product range covers various electronic applications requiring precise resistance control, circuit protection, and power switching. The main product lines available through Centenary Materials include SMD chip resistors, resistor networks, J-FET, MOSFET and modules, metal oxide film resistors, carbon film resistors, and fuses. Centenary Materials offers in-stock supply, fast quotation and sourcing service for parts not currently listed.