South Korea aims for 50% domestic defense semiconductor supply by 2029

South Korea’s push for 50% domestic defense semiconductor supply is a tactical hedge against Taiwan Strait volatility and U.S.-China tech decoupling. Technically, it will accelerate vertical integration in military-specific domains like SiC/GaN power devices and radiation-hardened SoCs—but IP and equipment beyond mature nodes remain bottlenecked by ASML and Applied Materials. Compliance-wise, firms face 15–20% higher operational costs from dual-supply-chain restructuring, especially radar/EW system makers reliant on TSMC’s sub-7nm nodes. Strategically, the U.S. may pressure Samsung to share more mil-spec process data under ‘trusted partner’ frameworks, while Japan and Israel deepen collaboration on specialty materials and EDA tools. Within 18 months, this policy will spur a bifurcated ‘defense-commercial’ semiconductor ecosystem in Korea—but without breakthroughs in EUV lithography or advanced packaging, the 50% target risks being a packaging-level illusion.