Samsung Electro-Mechanics Plans $1.85 Billion Vietnam Expansion as AI Drives Substrate Demand

Thai Nguyen gets 37% of a major substrate investment

Samsung Electro-Mechanics plans to invest 2.51 trillion won, approximately $1.85 billion, in expanding semiconductor packaging substrate production at its Vietnamese subsidiary in Yen Binh Industrial Park, Thai Nguyen province. The project forms part of a 6.78 trillion won investment program aimed at supplying the increasingly complex chips used in AI servers, powerful computers and automotive electronics.

The larger allocation, 4.27 trillion won, will expand production at Sejong in South Korea. Vietnam therefore accounts for about 37% of the program, calculated from the two allocations in won. Samsung Electro-Mechanics describes the program as its largest investment in a single product line.

The products are flip chip ball grid array substrates, usually shortened to FCBGA. They connect processors to main circuit boards, carrying electrical signals and delivering power. They are not the processors themselves, but their design and manufacturing quality help determine how reliably those processors operate.

The company announcement sets June 2030 as the target for completing construction and starting operations at the expanded Vietnam facility. Reports citing investment filings give an earlier deadline, April 2028. That discrepancy remains unresolved and matters for assessing when additional supply will reach customers.

The expansion builds on an existing substrate operation rather than establishing an entirely new business in Vietnam. An earlier $850 million investment, announced in December 2021, funded FCBGA facilities and infrastructure, with large scale operations reported to have begun in 2024.

What the investment figures and schedules show

The most consistent figures across reports are the allocations in Korean won: 4.27 trillion for Sejong and 2.51 trillion for Vietnam, adding up to 6.78 trillion. Dollar conversions vary. The Vietnam allocation is described as $1.84 billion to $1.9 billion, while estimates for the entire program range from $4.9 billion to approximately $5.05 billion.

One account gives the broader program as 6.70 trillion won rather than 6.78 trillion. The two stated site allocations support the latter total. The dollar variations should not be treated as separate investment commitments.

Reports place board approval on September 28, 2026, followed by an announcement on September 29. Spending on Sejong is scheduled from September 2026 through May 2028, with mass production on the new lines expected in September 2028. The Sejong investment is described as equivalent to about 44% of Samsung Electro-Mechanics' consolidated equity at the end of 2025.

Vietnam's schedule is less settled. The company announcement gives June 2030 for construction completion and operations, while two reports give completion by the end of April 2028. Another describes the broader investment as running through 2028. These accounts do not explain whether the dates refer to different project stages, so April 2028 cannot be presented as a confirmed replacement for June 2030.

Why AI chips need more complex substrates

An FCBGA substrate is a densely wired platform between a semiconductor chip and the circuit board beneath it. In a flip chip connection, tiny conductive bumps connect the chip to the substrate. The substrate then routes signals and power through multiple layers of circuitry.

AI accelerators, graphics processing units and central processing units require many connections and rapid movement of data. As chip packages become larger or bring several chips together, their substrates need more surface area, more layers and finer electrical pathways. Manufacturing those pathways consistently is part of the technical challenge.

Samsung Electro-Mechanics explained these requirements in its December 2021 investment announcement. The company said advanced substrates required more layers, microcircuits, precise connections between layers and thinner structures. It also described packaging several chips together as one reason substrate technology was becoming more important to semiconductor performance.

Samsung Electro-Mechanics President and CEO Chang Duckhyun described the business rationale in a statement accompanying the latest expansion:

As the AI and high-performance computing markets grow rapidly, high-value-added semiconductor substrates are becoming increasingly important as key components that determine semiconductor performance and supply chain stability,

The company expects AI infrastructure investment to continue over the next two to three years. That is its demand outlook, not a guarantee of orders through the Vietnam project's entire construction period.

Customer commitments underpin the expansion

Samsung Electro-Mechanics says the program is based on cooperation with global technology and semiconductor customers over the medium and long term. That cooperation includes customer funding support and purchase commitments or volume guarantees.

Such arrangements can reduce the risk of building expensive production lines before demand is secured. Funding support can help meet upfront costs, while commitments to buy output provide a basis for planning how heavily the facilities will be used.

The terms have not been disclosed. Samsung Electro-Mechanics has not named the participating customers, specified the additional production capacity or announced the number of employees it expects to hire in Vietnam. There is also no disclosed breakdown of how much investment customers will finance.

A separate report attributes to Chang a statement that demand for server and data center FCBGA exceeds 50% of current production capacity. The wording does not establish whether this refers to demand above capacity or to the share of capacity serving those applications. It cannot reliably be used to calculate a supply shortage.

The distinction between market expectations and contracted demand is especially relevant here. Sejong's new lines are expected to enter mass production in 2028, while the company's stated Vietnam target extends to 2030. Customer agreements may support those investments, but their undisclosed duration makes it impossible to judge how much of the later output is already covered.

Sejong and Vietnam have different, overlapping roles

Sejong is intended to become a key mass production hub for technically demanding substrates, particularly products for AI servers. Vietnam is assigned a strategic role in meeting global volume demand, improving production efficiency and maintaining stable supply.

This is not a simple division between advanced production in South Korea and basic production in Vietnam. Samsung Electro-Mechanics already produces advanced substrates at its Vietnamese facility. Reports also describe approval for very large FCBGA products serving AI servers, robotics, smart vehicles, defense applications and high performance computing.

The latest plan develops a manufacturing network outlined in 2021. At that time, Samsung Electro-Mechanics designated Vietnam as an FCBGA production base, with Suwon and Busan supporting technology development and production of more advanced products.

In the 2021 announcement, Chang, identified as CEO, explained the demand behind that earlier investment:

The demand for high-performance semiconductor package substrates is increasing as chips become more advanced and the market for 5G, AI, and cloud grows. We will develop semiconductor package substrates based on our differentiated technology to provide a valuable experience to customers.

The same announcement forecast annual FCBGA market growth of more than 14% and tighter supply through 2026. Those were forecasts made in 2021, not measurements of subsequent growth. The new investment shows continued commitment to the product, but does not by itself demonstrate that the earlier forecast was met.

How the Thai Nguyen operation developed

Samsung Electro-Mechanics Vietnam received its initial investment certificate in 2013, with registered capital of $1.2 billion. Operations began in February 2015. The plant initially manufactured and assembled high density interconnection boards and components including camera modules, power converters, touch modules and linear motors.

The progression from those activities to semiconductor substrates has taken place over several investment rounds:

• 2013: The Thai Nguyen project received its initial investment certificate with $1.2 billion in registered capital.
• February 2015: The plant began operations.
• May 2020: Registered capital reached nearly $1.35 billion after adjustments.
• December 23, 2021: Samsung Electro-Mechanics approved $850 million for Vietnamese FCBGA facilities and infrastructure, to be invested in phases through 2023.
• February 2022: Thai Nguyen approved an additional $920 million in registered capital, bringing the project total to $2.27 billion.
• 2022: Trial substrate production reportedly began in Thai Nguyen.
• 2024: The Vietnam FCBGA plant reportedly began large scale operations.
• September 2028: Sejong's expanded lines are expected to begin mass production.
• June 2030: The company announcement targets completion and operations for the Vietnam expansion, although other reports give April 2028.

The February 2022 capital adjustment targeted high density interconnection board capacity of 73,000 square meters per month, alongside expansion of products including camera modules and lenses. That figure is not a disclosed capacity target for the new FCBGA expansion.

Registered capital approvals and corporate investment announcements measure different things. The $920 million adjustment should therefore not simply be added to the earlier $850 million announcement or the latest $1.85 billion plan to produce a cumulative spending total.

A substantial operation with a modest profit margin

According to Samsung Electro-Mechanics' audited 2025 financial statements, its wholly owned Vietnamese subsidiary generated revenue of 2.98 trillion won, approximately $2.19 billion, and profit of 47.68 billion won, approximately $35.1 million.

Dividing the reported profit by revenue gives a margin of about 1.6%. These figures cover the subsidiary, not just its FCBGA activity, so they do not establish the profitability of substrate production alone.

At December 31, 2025, the subsidiary had assets of 2.65 trillion won, approximately $1.95 billion, and liabilities of 1.68 trillion won, reported at about $1.25 billion. The planned 2.51 trillion won expansion is equivalent to roughly 95% of those year end assets, illustrating its scale relative to the existing business.

Samsung Electro-Mechanics reported consolidated 2025 revenue of 11.31 trillion won, approximately $8.32 billion, and operating profit of 913.3 billion won, approximately $672.1 million. The Vietnamese subsidiary's revenue was equivalent to about 26.3% of the consolidated revenue figure.

That is a simple size comparison, not a confirmed contribution to consolidated sales. Transactions within a corporate group can be removed when accounts are consolidated. The subsidiary's reported profit also should not be compared directly with group operating profit as though both measures were identical.

Separate Samsung projects add testing and infrastructure

Samsung Electronics is separately planning 105.79 trillion Vietnamese dong, approximately $4.09 billion, for memory chip testing facilities at Yen Binh Industrial Park. Its first production line is targeted for the fourth quarter of 2027, with another planned for 2028.

Those facilities would carry out final testing of DRAM and NAND flash chips packaged at Samsung's Cheonan plant in South Korea. DRAM provides working memory, while NAND flash retains stored data. The project does not include wafer manufacturing, the stage at which chips are formed on semiconductor material.

About 66.64 trillion dong, or 63% of the testing investment, is planned to come from reinvested profits generated by Samsung's Vietnamese operations. That portion depends on future earnings. Reports also describe 103 Vietnamese engineers receiving training at Cheonan and Onyang in memory testing and equipment operation.

The testing project and the substrate expansion together represent roughly $5.94 billion in planned Vietnam investment, using the $4.09 billion and $1.85 billion estimates. They belong to different Samsung affiliates and serve different parts of semiconductor production.

Samsung has not disclosed how testing volumes would be divided between Vietnam and South Korea. Moving packaged chips between countries also adds transport and coordination requirements, even if it creates more flexibility across production sites.

A separate reported $1 billion investment involving Samsung group companies and US based Helix Digital Infrastructure concerns data centers and AI infrastructure. It should not be counted as part of the Thai Nguyen substrate expansion or treated as a disclosed purchase commitment for its output.

Vietnam seeks more domestic value from semiconductor investment

The expansion arrives as Vietnam tries to increase the domestic share of value in its electronics industry. Its electronics localization rate is reported at around 5% to 10%, against government targets of 25% to 30% by 2030 and 35% to 40% by 2035. Those figures refer to electronics broadly, not specifically to Samsung's substrates.

Politburo Resolution 19-NQ/TW, dated July 28, 2026, identifies semiconductors and new materials as priority sectors and calls for stronger links between foreign invested manufacturers and domestic businesses. The practical issue is whether new factories will purchase more local materials, equipment and technical services.

Vietnam already hosts substantial assembly, packaging and testing operations run by Intel, Amkor and Hana Micron. Intel has reportedly continued moving some activity from Costa Rica to Vietnam in 2026, including work related to server and networking chips. LG Innotek has also announced a roughly $1 billion substrate project in Hai Phong, while reports say advanced production and substrate development remain at Gumi in South Korea.

Domestic company FPT announced an advanced packaging and testing plant in Bac Ninh on January 28, 2026. Its initial 2026 to 2027 phase covers 1,600 square meters and six functional testing lines, plus reliability and durability testing. FPT designs chips in Vietnam but has them manufactured overseas, so the plant would bring another production stage into the country.

Regional competition is also growing. Broadcom and Toppan Holdings opened an advanced FCBGA substrate facility in Singapore during the same week as Samsung's announcement. Malaysia and Singapore have deeper semiconductor ecosystems, making supplier development and technical skills important competitive factors for Vietnam.

Skills and materials remain unfinished parts of the plan

Vietnam's semiconductor workforce program targets at least 50,000 workers with university qualifications or higher by 2030. That includes 15,000 in chip design and 35,000 in manufacturing, packaging, testing and related work.

Samsung introduced semiconductor training into its Samsung Innovation Campus program in 2026, with introductory, basic and advanced levels. The program aims to train about 2,200 students during the year, while a Bac Ninh laboratory simulates semiconductor assembly. That training target is not a hiring commitment for the Thai Nguyen expansion.

Materials projects show both opportunity and the distance still to travel. Vietnam National Chemical Group completed an initial study in June 2026 on entering semiconductor supply chains. Its plans include upgrading existing industrial chemicals to electronic grade, building a suitable laboratory and investigating regeneration of isopropyl alcohol solvent.

Ordinary industrial chemical production is not enough for chip manufacturing. Some semiconductor solvent specifications require metallic impurities below 0.01 parts per billion, demanding specialized purification, measurement and contamination control. The chemical group's work remains research into raising standards, rather than established commercial semiconductor supply.

Other efforts include research into refining domestic quartz to silica with 99.99% purity, a planned quartz project in Quang Tri with capacity of 1,500 tons annually, and Tokuyama's semiconductor grade polycrystalline silicon facility opened in Vietnam in August 2026. These activities concern different materials and processing stages. High purity quartz is not a wafer, and 99.99% pure silica is not semiconductor grade silicon.

For the Samsung expansion, the decisive missing details remain the added output, customer identities, funding terms, hiring plans and a reconciled completion schedule. Investment in a factory can increase production and exports. Its contribution to domestic technological capability will depend on the work Vietnamese engineers and suppliers actually undertake.

Key Points

• Samsung Electro-Mechanics plans 2.51 trillion won, about $1.85 billion, for its Vietnam FCBGA expansion.
• Vietnam receives about 37% of a 6.78 trillion won program, with the remainder allocated to Sejong.
• Sejong mass production is targeted for September 2028. Vietnam's stated June 2030 target conflicts with reports giving April 2028.
• Customer funding and purchase commitments support the plan, but customers, added capacity and hiring figures remain undisclosed.
• The Vietnamese subsidiary reported $2.19 billion in revenue and $35.1 million in profit for 2025.
• Samsung Electronics' separate $4.09 billion Vietnam project concerns memory chip testing, not wafer fabrication.
• Vietnam is expanding packaging, testing and materials capabilities, while domestic sourcing and specialist skills remain limited.