Radar and missile launcher systems among key applications; MCT packaging supported by JMJ Korea.

The MCT from Sigetronics is packaged in a TO-247 form factor.

Sigetronics, a Korean company specializing in non-memory semiconductor devices, has successfully localized a high-voltage power semiconductor—the MOS Controlled Thyristor (MCT)—for use in defense systems. This marks the company’s first entry into the defense sector with a domestically produced strategic component, opening up new revenue streams amid booming demand in Korea's missile and radar markets.

On the 28th, Sigetronics announced that it had succeeded in mass-producing MCTs, a type of semiconductor switch designed to control extremely high voltages and currents within milliseconds. MCTs are critical components in military systems such as radar and missile launchers, where fast and stable high-power switching is essential.

The company confirmed that its MCT will be installed in portable missile systems developed by a major Korean defense contractor.

CEO Kyuhwan Shim commented, “This will contribute meaningful revenue for the company.” He noted that military-grade components, although produced in smaller volumes than commercial equivalents, offer higher profitability. MCTs are expected to account for 5–10% of Sigetronics’ revenue in 2024, with potential to more than double in 2025 as adoption widens.

Until now, Korea has been entirely dependent on imports for MCTs, with Excelitas Technologies in the U.S. holding a near-monopoly on supply. Due to strict export controls, stable sourcing has long been a challenge. Sigetronics overcame this by combining its own semiconductor fabrication capabilities with technology transferred from the Electronics and Telecommunications Research Institute (ETRI). The localized MCTs offer breakdown voltages above 1,500V and instantaneous switching power over 2kW.

Packaging for the device was developed by JMJ Korea, which also received related MCT technology from ETRI. The company offers custom packaging formats, including TO-247 and F-PAK, using proprietary flip-chip and clip bonding techniques.

Dr. Deok-ho Cho, Executive VP and Head of R&D at Sigetronics, emphasized the significance of this achievement:

“Localizing the MCT is a pivotal step toward building a self-reliant ecosystem for defense semiconductors. It carries strategic importance not only for national security but also for Korea’s broader efforts to secure next-generation semiconductor technologies.”

He added that sustained government support and investment is crucial for further collaboration between public research institutes and SMEs to expand Korea’s defense semiconductor industry.

TheElec, April 28, 2025