ROHM Co., Ltd.

Founded as Toyo Electric Apparatus Manufacturing. Development and launch of carbon film fixed resistors.

Establishment of Toyo Electric Apparatus Manufacturing Co., Ltd.

Initiation of in-house assembly of resistors.

Development and launch of metal film fixed resistors.

Publication of "Music History Seen with the Eyes" (5 volumes with Sonosheet). Introduction of quality management.

Establishment of ROHM WACO Co., Ltd. Formulation of corporate purpose and basic management policy.

Development and launch of transistors and switching diodes.

Completion of productization of diode array and diode matrix.

Established ROHM Apollo Co., Ltd. and began IC development.

Published "History of Musical Instruments" (5 volumes with Sonosheet). Established a local subsidiary in California, USA. Introduced computers for office automation.

Developed and began selling transistors. Established ROHM Electronics GmbH.

Established ROHM Korea Corporation.

Developed and began selling light-emitting diodes and network resistors.

Established ROHM Electronics (H.K.) Co., Ltd. Developed and began selling thermal print heads.

Developed and began selling lattice-shaped chip-fixed resistors.

Developed the world's smallest and thinnest chip LED "PICOLED®". Obtained ISO/IEC17025 laboratory certification.

Started a newspaper serial "ROHM-kun's Kyoto Museum Diary" for corporate PR. Established ROHM Electronics Asia Pte. Ltd. (RES DIVISION).

Completed development and research of constant-voltage diodes.

Published "Music of Asia" (4 volumes with cassette tapes). Established ROHM Fukuoka Co., Ltd.

Developed and began selling digital transistors. Established a semiconductor research center.

Developed and began selling band-switching diodes. Listed on the Second Section of the Tokyo Stock Exchange.

Established ROHM Amagi Co., Ltd. First worldwide success in industrializing semiconductor lasers using the MBE method.

Developed microcontrollers using original 4-bit/8-bit CPUs.

Published PR magazine "ROHM-kun's Kyoto Museum Diary I". Began selling capacitors. Commercialized and began selling memory ICs. Established a research and development center. Promoted to the First Section of the Tokyo Stock Exchange.

Developed the world's first noise-free automotive op-amp. Obtained ISO/IEC17025 laboratory certification.

Obtained ISO14001 environmental management system certification. Secured basic patents for flash memory in the United States.

Established ROHM Mechatronics Co., Ltd. Established and began selling LCD process technology. Established ROHM Win UK. Hosted ROHM-kun's Music Concert & Play Bach.

Started mass production of SiC-DMOSFETs. Introduced in-house LED lighting, high-efficiency HVAC, and rooftop greening. Renovated the ROHM Kyoto Station Front Building. Began mass production of SiC Schottky barrier diodes.

Construction of the "Qinghua Room Electronics Engineering Hall" at Tsinghua University. Establishment of ROHM Semiconductor India Pvt. Ltd.

Development of the world’s smallest "0402 size" Zener diode. Commencement of mass production of full SiC power modules. The Roome Kyoto Station Front Building received the Energy Conservation Grand Prize "Minister of the Agency for Natural Resources and Energy Award".

Held the "Kyoto International Music Student Festival '93". Establishment of ROHM Mechatech Philippines, Inc. and ROHM Electronics (Malaysia) Sdn. Bhd. Established a manufacturing-related company in Tianjin.

Started a newspaper column "Roome-kun's New Museum Diary: Science of Japanese Folk Tales". Obtained ISO9001 certification.

Published the CD-ROM "Roome-kun's Kyoto Museum Diary – Soundscape Report Edition". Opened the Second LSI Research Center.

Established ROHM Electronics (Philippines) Sales Corporation, ROHM Electronics Korea Corporation, and Roome Wako Device Co., Ltd.

Established ROHM Electronics (France) S.A.S. and ROHM Electronics (Thailand) Co., Ltd. Opened the Yokohama Technology Center. Published the CD-ROM "Roome-kun's Kyoto Museum Diary vol.2".

Sponsored the concert "Kazuo Ozawa Conducts the New Japan Philharmonic Symphony". Started the newspaper column "Roome-kun's New Museum Diary". Opened the VLSI Research Center. Obtained ISO14001 certification for the Environmental Management System.

Established ROHM Electronics (Shanghai) Co., Ltd. and Roome Hamamatsu Co., Ltd. Opened the LSI Development Center and the Kyoto Technology Center.

Sponsored the "Autumn Music Festival in Kyoto Opening Concert". Started sponsoring the "Kazuo Ozawa Music School Opera Project I". Established ROHM Semiconductor (China) Co., Ltd. Opened the Europe Technology Center.

Donated the Ritsumeikan University Roome Memorial Hall. Started afforestation of "Roome Forest" in Australia. Opened Roome (Shin-Yokohama).

Opened the Optical Device Research Center.

Started sponsoring the "Kyoto Student Festival". Donated the Doshisha Roome Memorial Hall. Established Roome Tsukuba Co., Ltd. and ROHM Electronics Trading (Dalian) Co., Ltd. Opened the LSI Measurement Technology Center.

Opened the Taiwan Technology Center and the Shanghai Technology Center.

Sponsored the Chinese performance of the "Kazuo Ozawa Music School Opera Project". Donated the Kyoto University Roome Memorial Hall. Opened the Korea Technology Center.

Released the Japanese SP classic reissue collection II. Established ROHM Electronics (Shenzhen) Co., Ltd. and ROHM Integrated Systems (Thailand) Co., Ltd. Opened the Nagoya Design Center and the Shenzhen Technology Center.

Developed the world’s smallest and thinnest chip LED "PICOLED®". Obtained ISO/IEC17025 laboratory accreditation.

Obtained process certification for the automotive functional safety standard "ISO26262". Announced products featuring the power technology "Nano" and the ultra-low current technology "Nano Energy™".

Obtained OHSAS18001 occupational health and safety certification. Donated the Roome BNCT Center to Kyoto Prefectural University of Medicine.

Commenced mass production of the world’s first SiC-DMOSFET. Implemented in-house LED lighting, high-efficiency HVAC, and rooftop greening. Renovated the Roome Kyoto Station Front Building. Commenced mass production of the SiC Schottky barrier diode.

Construction of the "Qinghua Room Electronics Engineering Hall" at Tsinghua University. Establishment of ROHM Semiconductor India Pvt. Ltd.

Development of the world’s smallest "0402 size" Zener diode. Commencement of mass production of full SiC power modules.

Hosted the "Kyoto International Music Student Festival '93". Establishment of ROHM Mechatech Philippines, Inc. and ROHM Electronics (Malaysia) Sdn. Bhd. Set up a manufacturing-related company in Tianjin.

Started a newspaper column "Roome-kun’s New Museum Diary: Exploring Japanese Folktales through Science." Obtained ISO9001 certification.

Published the CD-ROM "Roome-kun’s Kyoto Museum Diary – Soundscape Report Edition." Opened the Second LSI Research Center.

Presented Roome’s proprietary ultra‑fast pulse control technology (later named "Nano Pulse Control™"). Opened the "Roome Theater Kyoto."

Developed the world’s first noise‑free automotive op‑amp.

Obtained certification for the automotive functional safety standard ISO26262 development process. Announced products featuring the Nano power technology and the ultra‑low‑current Nano Energy™ technology.

Obtained ISO26262 certification for automotive functional safety. Achieved certification for the world’s first international wireless communication standard Wi‑SUN FAN.

Formulated the "Management Vision." Developed the fourth‑generation SiC MOSFET with industry‑leading low on‑resistance.

Formulated the mid‑term management plan "MOVING FORWARD to 2025." Established the Roome Group Environmental Vision 2050. Donated the Roome BNCT Center to Kyoto Prefectural University of Medicine. Joined the international initiative RE100.

Reorganized domestic manufacturing subsidiaries into the upstream "Roome Device Manufacturing Co., Ltd." and downstream "Roome Assembly Manufacturing Co., Ltd." Signed a cooperation agreement with Kyoto City to build a decarbonized society. Signed an agreement with Shiga Prefecture to "Connect People and Forests." Joined the international initiative RE100.