Discrete Semiconductor Devices - General-Purpose Devices
Maintaining a top-class market share as a cash cow business
In the discrete semiconductor devices business, there is a focus on power devices, but demand for small signal general-purpose devices is expected to steadily grow as the performance of various types of devices increases and more extensive use is made of electronics. For example, small signal eneral-purpose devices (transistors and diodes) for 1 watt or less, which are used in control circuits and similar items, are necessary parts for electrification of automobiles and industrial equipment, and ROHM boasts a large share on account of the development, manufacturing, and sales know-how it has acquired over many years. While maintaining our large share as a cash cow business, having the business contribute to ROHM growth is a topic related to the general-purpose device business in the Medium-Term Management Plan.
For general-purpose devices, it is necessary to provide customers with a stable, low-cost supply because large volumes of them are used in numerous applications. By introducing highly efficient production lines and labor-saving lines, ROHM is increasing its productivity and capacity in addition to achieving stable supply, lower costs, and improved services. As semiconductors used in automobile must be of particularly high quality, we leverage the strengths of IDM and thoroughly manage quality.
Through these initiatives, we are steadily fulfilling the desires of customers and contributing to profit growth in the medium and long term.
Performance by segment
FY ending March 2025
-
■Discrete Semiconductor Devices
- 187.0billion yen
- 42%
- ■ICs
203.8billion yen 45% - ■Modules
32.5billion yen 7% - ■Others
25.0billion yen 6%
Sales
448.4billion yen
Sales by application
FY ending March 2025
-
Automotive
57%
-
Industrial
17%
-
Consumer
14%
-
Communication
2%
-
Computer&Storage
9%
Discrete Semiconductor Devices Net sales
187.0billion yen
ROHM’s Position (2024)
Worldwide small signal device market
- Total market
- 3,617million U.S. dollars
Small signal transistors
- Total market
- 1,576million U.S. dollars
Small signal diodes
- Total market
- 2,041million U.S. dollars
Source:Competitive Landscaping Tool CLT, Annual 2Q24
Key products

Small-signal devices
Small-signal transistors (less than 1W)
Small-signal diodes (less than 500mA)
Used universally in a variety of applications.

Light-emitting diodes (LED)
Discrete semiconductor devices which emit light when voltage is applied.Used for lighting and status indications, etc. in all kinds of electronic devices.
Laser diodes
ROHM’s laser diodes boast the industry’s leading production volume. They are used in laser printers and multifunction printers, and in recent years in laser ranging devices and as a light source for LiDAR, etc.
TOPICS|
Toward the Realization of a Sustainable Society
Development of a 120W high-power laser diode for LiDAR
LiDAR, a technology capable of accurate distance measurement and spatial recognition, has recently been seeing increased adoption in a wide range of applications requiring the automation of operation, including AGVs, robot vacuum cleaners, and autonomous automobiles. ROHM has established proprietary patented technology that achieves narrower emission width in lasers which contributes to longer range and higher accuracy in LiDAR applications.
ROHM released a 25W laser diode in 2019 and a 75W laser diode in 2021. In response to growing market demand for even higher output, in September 2023 ROHM developed a new infrared 120W high-output laser diode, aimed at LiDAR used for distance measurement and spatial recognition in 3D ToF systems.
Utilizing proprietary device development technology, the diode reduces the temperature dependence of the laser wavelength by 66% from that of general products and contributes to narrowing the bandpass filter to extend the detection range of LiDAR. It also achieves a uniform light intensity in over 97% of its emission width to enable more precise detection, despite having the smallest width in the industry. Its high power conversion efficiency (PCE) enables high-efficiency optical output that contributes to lower power consumption in LiDAR applications.