Critical Subsystems: Mapping Out Risks Posed by Growing Trade War

By Julian West

First published on SEMI Blog


The recent anti-globalization political rhetoric veering towards nationalism raises a number of challenges for the semiconductor supply chain. Throughout the ongoing U.S.-China trade war, and now the dispute between South Korea and Japan, most attention has focussed on the consequences for players at the top of the supply chain. However, some of the biggest risks might be hidden further down the chain, where some critical subsystems technologies face significant geographical concentration risks.

Critical subsystems include advanced technologies such as the RF power supplies, vacuum valves, vacuum pumps, lasers, optics, and robotics used in semiconductor manufacturing equipment. Many of these technologies are highly specialised with high barriers to entry and only a small number of major suppliers. Each major region has its own strengths and weaknesses, but no single region holds the key to all these technologies.

Critical subsystems suppliers are concentrated in North America, Europe and Japan, where thin film manufacturing technology originated. These regions are also home to the suppliers’ main OEM customers. In 2018, suppliers headquartered in these three regions accounted for 44%, 26% and 24% of critical subsystems revenue, respectively. However, as with most global industries, the company headquarters and manufacturing facilities do not necessarily share the same location.

Critical subsystem companies historically have moved manufacturing facilities abroad to reduce costs. More recently, one main driver for manufacturing relocations has been the need to be near end customers as their technology requirements become more complex. Another is the necessity to boost ‘local content’ of their product in their end markets at the behest of foreign governments, particularly in China.




However, at a time of heighted political tensions, owning manufacturing facilities in foreign countries poses significant risks from foreign government policies or currency fluctuations, a reality highlighted this week with the devaluation of the Chinese Yuan.

Of the three regions, North American companies are most vulnerable to political tensions: 43% of the value of North American critical subsystems are manufactured outside of their home region, considerably more than the 16% manufactured outside of Japan by Japanese suppliers. Furthermore, North American suppliers have by far the largest exposure to China, with 77% of all critical subsystems made in China owned by U.S. companies.


This analysis uses aggregated data from individual subsystems segments in VLSI Research’s Critical Subsystems database. At a high level, we can see that three regions control most of the critical subsystems supply, with U.S. companies saddled by the greatest exposure to global trade tensions. However, individual subsystems segments, many of them controlled entirely by a few companies, have their own stories to tell. Semiconductor manufacturers must understand where components and subsystems in their supply chain are made and who controls the supply since some critical subsystems face ongoing trade sanction threats that could be severe.

For more information about critical subsystems and the VLSI Research Critical Subsystems database, visit

Julian West is a technical and market analyst at VLSI Research Europe.

Topics: China , Europe , semiconductor manufacturing , North America , South Korea , Japan , United States , Critical Subsystems ,trade war , VLSI Europe , global supply chain , thin film

TrustedParts x A