Samsung Electro-Mechanics (SEMCO) will commit 6.78 trillion won (approximately US$5.0 billion at recent exchange rates) to expand manufacturing capacity for AI chip package substrates, the Korea-listed electronic components maker disclosed.

The investment targets high-density flip-chip ball grid array (FC-BGA) substrates used to mount graphics processing units, AI training accelerators and high-performance computing processors on system boards. Package substrates are the multi-layer printed circuit boards that sit between a silicon die and the main motherboard, carrying thousands of signal and power connections.

What Samsung Electro-Mechanics produces

Samsung Electro-Mechanics is the components subsidiary of the Samsung conglomerate, headquartered in Suwon. Its product lines include:

• Multilayer ceramic capacitors (MLCCs)
• Camera modules for mobile and automotive applications
• Package substrates, including FC-BGA, FC-CSP and rigid-flex printed circuit boards
• Power inductors, chip resistors and other passive components

The substrate segment has become SEMCO's highest-margin business over the past five years, riding demand from AI server builders and HPC customers.

What AI chip package substrates require

High-end substrates for AI accelerators must meet specifications that distinguish them from standard package substrates used in consumer electronics. Key requirements include:

• Large panel formats, typically 100 mm × 100 mm or larger
• Line/space pitch below 10 micrometres on inner layers
• Layer counts of 16 or more for complex system-in-package assemblies
• Tight impedance control for high-speed serial interfaces such as PCIe Gen5 and NVLink

These specifications place AI-class substrates in a narrower supplier pool than commodity FC-BGA products.

The supplier landscape

The global high-end FC-BGA market is concentrated among four Asian producers. Outside Korea, Ibiden and Shinko Electric Industries supply substrates from Japan, while Unimicron and Kinsus operate from Taiwan. SEMCO competes directly with all four in the premium tier.

Demand for advanced substrates has outpaced available capacity since the launch of Nvidia's H100 accelerator in late 2023, with substrate suppliers reporting order backlogs extending across multiple quarters. AI training infrastructure buildouts by hyperscale operators have sustained the order pipeline through 2024 and 2025.

Scale of the commitment

A 6.78 trillion won capex programme ranks among the largest single-purpose investment announcements in the global substrate industry over the past decade. By comparison, SEMCO's group-wide capital expenditure in 2023 totalled approximately 2.5 trillion won, indicating the new programme represents a multi-year capacity build-out rather than a single fiscal-year outlay.

Substrate fabrication facilities typically require 18 to 24 months from groundbreaking to volume production, which means new output from the announced programme would not reach commercial scale before 2026 or 2027.

What it changes for customers

For AI accelerator customers evaluating second-source supply, the announcement signals multi-year demand visibility from SEMCO's order book. Allocation has been a recurring feature of the FC-BGA market since 2023, with Nvidia, AMD and hyperscale buyers securing priority access through long-term contracts.

The capacity buildout also affects competitive positioning. SEMCO has historically held an estimated 15 to 20 percent share of the high-end FC-BGA segment. Industry analysts tracking substrate supply have attributed the company a credible path to a higher share figure if the announced capacity executes on schedule.

Outlook

The 6.78 trillion won programme will be tracked by foundries, fabless chip designers and substrate customers evaluating supply security for next-generation AI accelerators. Samsung Electronics' Device Solutions division, which operates the foundry business, also sources FC-BGA substrates from SEMCO for memory packages and advanced logic, creating internal demand alongside external customers.

If executed as announced, the investment would add meaningful volume to a market that has remained structurally short of high-end substrate capacity for over two years.