Rohm

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Japanese manufacturer of semiconductors and electronic components.

Last updated August 21, 2026

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Overview

Rohm Co., Ltd., commonly styled as ROHM and historically known as Rohm Semiconductor, is a Japanese manufacturer of semiconductors and electronic components headquartered in Kyoto. The company was incorporated on September 17, 1958, as Toyo Electronics Industry Corporation by Kenichiro Sato. Its original business was the manufacture of resistors, and the company name ultimately combined the letter “R,” referring to resistors, with “ohm,” the unit used to measure electrical resistance. Rohm’s early identity was therefore rooted in passive electronic components rather than in the semiconductor industry. Over time, it expanded into semiconductor production and developed a broader portfolio spanning integrated circuits, discrete semiconductors, LEDs, sensors, power-management devices, and other electronic parts. The company formally adopted the name Rohm in 1979 and changed its corporate name again to Rohm Semiconductor in January 2009. The brand is generally presented as Rohm or ROHM, while the corporate name has also been associated with Rohm Co., Ltd. Semiconductors became the center of the business as Rohm moved beyond resistors. Integrated circuits and discrete semiconductors account for approximately 80 percent of the company’s revenue according to the referenced company description. Its portfolio includes power-stage ICs for power supplies, CMOS operational amplifiers for sensor-signal amplification, Hall-effect sensors, DC-to-DC controller ICs, current-sensor ICs, AC-to-DC converter products, LEDs, and other analog, power, and mixed-signal devices. Through its Lapis Semiconductor activities, Rohm also develops and manufactures FeRAM and other large-scale integrated circuits. Lapis originated from the former OKI Semiconductor business, which had been a division of Oki Electric. Rohm serves electronics manufacturers and system designers across a range of applications. Its products are used as building blocks in power supplies, industrial equipment, sensing systems, automotive electronics, consumer devices, and other electronic systems, although the available reference material does not provide a complete current market breakdown. The company’s positioning is based on supplying a broad set of components rather than relying on a single semiconductor category. Its combination of discrete devices, analog ICs, power-management products, sensors, LEDs, and memory-related technologies gives it exposure to multiple parts of the electronics value chain. The company has also expanded its manufacturing footprint outside Japan. In Malaysia, Rohm began construction of a production facility in Kelantan in 2016, and the plant began operating in April 2017. The original facility concentrated primarily on discrete semiconductor production, including diodes. In 2022, Rohm expanded the site to approximately one and a half times its previous size, with planned operations from 2023 focused additionally on analog LSIs and transistors. This expansion reflects the company’s effort to increase regional manufacturing capacity and support a wider semiconductor product mix. Rohm was listed among the world’s top 20 semiconductor sales leaders through 2012, according to the referenced Wikipedia material. The available sources do not establish a current ranking, detailed financial results, current executive roster, or a complete account of recent strategic initiatives. Rohm remains an active Japanese electronics-component and semiconductor manufacturer with international operations and a product portfolio extending from its original resistor business into advanced semiconductor and electronic-system components.

History

Rohm was established in Japan on September 17, 1958, when Kenichiro Sato incorporated Toyo Electronics Industry Corporation. The company’s original product was the resistor, a foundational passive component used to control current and voltage in electronic circuits. Its early name, R.ohm, referred to the letter R for resistor and ohm, the unit of electrical resistance. This naming connected the company directly to its initial technical specialization. As the electronics industry developed, Rohm broadened its activities beyond passive components. The company entered semiconductor manufacturing and gradually made integrated circuits and discrete semiconductor devices central to its business. This transition changed Rohm from a resistor-focused component maker into a diversified semiconductor and electronic-parts manufacturer. The company officially adopted the name Rohm in 1979. In January 2009, its corporate name was changed again to Rohm Semiconductor, although the brand is commonly styled as Rohm or ROHM. Rohm’s semiconductor portfolio expanded across analog and power-management applications, discrete devices, sensors, LEDs, and other integrated-circuit categories. Products described in the reference material include power-stage ICs for power supplies, CMOS operational amplifiers used to amplify sensor signals, Hall-effect sensors, DC-to-DC controller ICs, current-sensor ICs, and AC-to-DC converters. Through the Lapis Semiconductor division, Rohm also produces FeRAM and other LSI products. Lapis is associated with the former OKI Semiconductor business, previously operated as a division of Oki Electric. The company developed an international manufacturing presence as demand for semiconductor and electronic components became increasingly global. In 2016, Rohm began construction of a production facility in Kelantan, Malaysia. The site started operations in April 2017 and initially concentrated on discrete semiconductor products, including diodes. In 2022, Rohm announced an expansion that increased the facility’s size by approximately one and a half times. The expanded operation was planned to support production of analog large-scale integrated circuits and transistors in addition to the original discrete-semiconductor activities, with operations planned from 2023. Rohm’s business today encompasses both the original resistor heritage and a much larger semiconductor portfolio. Integrated circuits and discrete semiconductors are described as contributing about 80 percent of revenue, illustrating the extent to which the company’s center of gravity moved toward semiconductor devices. Its components are intended for use in power conversion, sensing, industrial systems, automotive electronics, consumer electronics, and other equipment, although the supplied sources do not provide a complete application or geographic revenue breakdown. The company was counted among the top 20 semiconductor sales leaders through 2012 according to the referenced Wikipedia article. The available material does not provide sufficient information to document later rankings, current revenue, present leadership, or a detailed chronology of product launches. Rohm is nevertheless an active international electronics manufacturer whose historical development follows a clear progression from resistors to a broad portfolio of semiconductor and electronic-system components.

2022
Malaysian manufacturing expansion announced
[1]Rohmen.wikipedia.org
Rohm expanded the Kelantan facility by approximately one and a half times and planned to add analog LSIs and transistor production.
2017
Kelantan facility starts operations
[1]Rohmen.wikipedia.org
The Malaysian facility began operating in April, initially focusing mainly on discrete semiconductors such as diodes.
2016
Kelantan facility construction begins
[1]Rohmen.wikipedia.org
Rohm began construction of a production facility in Kelantan, Malaysia.
2012
Ranked among leading semiconductor companies
[1]Rohmen.wikipedia.org
Rohm was described as being among the top 20 semiconductor sales leaders through 2012.
2009
Corporate name changed to Rohm Semiconductor
[1]Rohmen.wikipedia.org
In January 2009, the company changed its corporate name to Rohm Semiconductor.
1979
Company name changed to Rohm
[1]Rohmen.wikipedia.org
The company formally adopted the Rohm name, derived from its resistor origins and the electrical unit ohm.
1958
Company incorporated as Toyo Electronics Industry Corporation
[1]Rohmen.wikipedia.org
Kenichiro Sato incorporated the company in Japan on September 17, 1958. Its original business focused on resistor manufacturing.

Products and positioning

A diversified semiconductor and electronic-component supplier with roots in resistor manufacturing and strengths in analog, power, discrete, sensor, LED, and other integrated-circuit technologies.

Semiconductors
Integrated circuits
Rohm produces a broad range of integrated circuits, including analog, power-management, control, sensing, and other application-oriented devices. ICs are now one of the company’s principal business areas, representing part of the semiconductor portfolio that accounts for approximately 80 percent of revenue together with discrete semiconductors. The available material does not provide a complete current product-family list.
Semiconductors
Discrete semiconductors
Rohm manufactures discrete semiconductor products, including diodes and transistors. These devices are used as individual switching, rectification, amplification, and protection elements in electronic circuits. Discrete semiconductors are a major part of Rohm’s business and were the initial focus of the company’s Kelantan, Malaysia, manufacturing operation.
Power electronics
Power-management ICs
Rohm’s power-management portfolio includes power-stage ICs, DC-to-DC controller ICs, and AC-to-DC converters. These products support the regulation, conversion, and control of electrical power in equipment and systems. They are intended for applications such as power supplies and other electronic designs requiring efficient voltage or current management.
Analog semiconductors
Analog and sensor ICs
The company offers analog devices including CMOS operational amplifiers, current-sensor ICs, and Hall-effect sensors. Operational amplifiers can be used to increase the strength of signals from sensors, while Hall-effect and current-sensing products detect magnetic fields or electrical current. These components serve as interface and measurement building blocks in electronic systems.
Optoelectronics
LEDs
LEDs are part of Rohm’s electronic-component portfolio. The supplied reference identifies LED production as one of the company’s product areas but does not specify current families, technical characteristics, applications, or launch dates.
Memory and integrated circuits
FeRAM and LSI products
Rohm’s Lapis Semiconductor division designs and manufactures FeRAM and other LSI integrated circuits. Lapis is associated with the former OKI Semiconductor operation, previously a division of Oki Electric. The supplied sources do not provide detailed specifications or a complete list of current memory products.
Passive electronic components · 1958
Resistors
Resistors were Rohm’s original core product and remain important to the company’s historical identity. The Rohm name itself references the resistor and the ohm, the unit of resistance. The available material does not describe current resistor families or their relative contribution to the business.

Brand decisions

2022
Broaden and enlarge the Kelantan facilityStrategy
Background
Rohm sought to increase production capacity and broaden the Malaysian site beyond its original discrete-semiconductor focus.
Action taken
The facility was expanded to approximately one and a half times its previous size, with plans to produce analog LSIs and transistors.
Aftermath
Operations using the expanded capacity were planned to begin in 2023.
Source
2016
Expand semiconductor manufacturing in MalaysiaStrategy
Background
Rohm pursued additional international manufacturing capacity by establishing a production site in Kelantan, Malaysia.
Action taken
The company began construction of a new facility focused initially on discrete semiconductor production.
Aftermath
The facility began operating in April 2017 and later became the subject of a further capacity expansion.
Source

Recent events

2022
Rohm expands Kelantan facility[1]Rohmen.wikipedia.org
Other
Rohm expanded its Malaysian facility to approximately one and a half times its previous size, with plans to add production of analog LSIs and transistors.
2017
Rohm begins operations at Malaysian facility[1]Rohmen.wikipedia.org
Other
The Kelantan facility commenced operations, with its initial production focused primarily on discrete semiconductors such as diodes.
2016
Rohm begins construction of Kelantan production facility[1]Rohmen.wikipedia.org
Other
Rohm started construction of a manufacturing facility in Kelantan, Malaysia, as part of its international production expansion.

Sources14 sources

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