The downsizing of resistors is approaching its limit, and the modularization is expected to spread in all types of equipment in the future. Modularization improves signal quality and enables high-speed transmission and processing.
Furthermore, since the wireless communication standard 5G that was introduced in 2019 enabled the high-speed communication, circuits that previously worked only with electrical signals now can work with optical signals. Thereafter, the development of modules with optical components have been boosted.
In the automotive field, modularization is rapidly advancing in order to secure the space for the installation of ADAS (Advanced driver-assistance systems), sensing systems for self-driving cars, image processing systems, and control systems.
The demand for higher density mounting increases the demand for higher power with the same conventional size. From that reason, the resistors that have been derated with a large margin are now used with tight derating in more cases.
In order to cope with this situation, it is necessary to reconsider the power rating, mounting, and land pattern recommendation, while improving the resistor itself. KOA has been promoting the use of terminal part temperature over ambient temperature for the derating curve of SMD resistors as a result of the reconsideration.