KOA Corporation is a Japanese electronic passive component supplier founded in 1940 in Tokyo and headquartered in Ina, Nagano Prefecture.KOA is one of the world's largest manufacturers of chip resistors. The product range covers low temperature co-fired ceramics (LTCC), resistors, temperature sensors, inductors, fuses and varistors. 1,100 of KOA's 3,600 employees worldwide are based in Japan. Production and sales bases are located in Japan, China, Taiwan, Malaysia, USA, Germany and Singapore.