LG Innotek expands Vietnam substrate plant as AI servers strain RF-SiP supply

The insatiable demand from AI servers for high-frequency, high-speed substrates is diverting HDI and ABF capacity away from RF-SiP—particularly those used in 5G mmWave smartphones—creating acute supply constraints. LG Innotek’s Vietnam expansion isn’t merely capacity scaling; it’s a strategic hedge against U.S.-China tech decoupling risks. This shift inflates cleanroom and material certification costs and will likely provoke Murata and Samsung Electro-Mechanics to accelerate their own Southeast Asian or Indian investments. Within 12 months, RF front-end module lead times could stretch by over 30%. While Taiwan, China-based suppliers retain technical edges, their market share is vulnerable without secured access to advanced FCCL and plating equipment. Crucially, substrates have evolved from passive components into strategic bottlenecks in the AI hardware stack—with allocation power increasingly dictated by chipmakers like NVIDIA and AMD.