Solid State Optronic was established in 1982,which headquarter is located in San Jose, USA. They focus much attention on innovative products for a developing and underserved market. There are sales offices in Israel, South Africa , Phoenix, Oakland, Ontario, Santa Monica, Arvada, Wallingford, Miami, Oakland, Sanford, Woodstock, Marion, Quincy, Schaumburg, Louisville, Westford, Novi, Bloomfield, Rochester, Exton, Pawtucket, Franklin, Addison, Kirkland, Milwaukee, Beijing, Shanghai, Shenzhen, Hong Kong, Belgium, Denmark, Finland, France, Germany, Italy, The Netherland, Norway, Poland, Russia, Sweden, United Kingdom. Their product line includes MOS output SSRs, SCR output SSRs, Multifunction Telecom Switches, Triac drivers, Transistor output, Darlington output, linear, logic gate. Base on earlier solid state technology, SSO developed proprietary patented technology in SSR design. SSO was the first one who offers a solid state relay with over-current protection in an ultra-miniature 4 pin SOP package-an achievement approved by the high-technology press. In 1999, SSO was awarded EPN's Product award. They aim to become the recognized leader in miniature, optically isolated semiconductor devices. Their mission is tested by the list of their customers and their growing international presence.