Renesas Electronics Corporation (ルネサス エレクトロニクス株式会社, Runesasu Erekutoronikusu Kabushiki Gaisha) TYO: 6723 is a Japanese semiconductor manufacturer headquartered in Tokyo. It has manufacturing, design and sales operations in around 20 countries. It is one of the world's largest makers of semiconductor systems for mobile phones and automotive applications, the world's largest maker of microcontrollers, and the second largest maker of application processors.