Intro

Data is no longer a matter of creation, but of processing. As AI-driven transformation accelerates across industries, including energy, logistics, and robotics, demand for data processing is growing exponentially. This has led to the rapid expansion of global data center capacity and high-performance computing (HPC) infrastructure, a trend reinforced by the continued advancement of autonomous driving and IoT technologies. Semiconductors are no longer limited to delivering faster computational performance; they are now expected to process vast volumes of data without delay and enable efficient data transfer. However, these demands have reached a level that cannot be addressed by incremental improvements in chip performance alone. The performance bottleneck no longer resides within the chip, but in the architecture that connects and moves data.

This is driving the growing importance of packaging technologies. In particular, package substrates are emerging as critical components of semiconductor performance, supporting functions such as signal transmission, power delivery, and thermal management, while serving as essential layers that define overall system performance. In an environment that simultaneously demands high-speed signal processing, power efficiency, and high integration density, conventional packaging approaches are reaching their limits.

In this context, Flip-Chip Ball Grid Array (FC-BGA), is drawing significant attention. As an advanced packaging solution, it enables high performance and high integration, emerging as an effective response to growing data processing demands. The market reflects this trend: the FC-BGA market is projected to grow from USD 5.42 billion in 2025 to USD 9.548 billion by 2032, representing a CAGR of approximately 10.6%.

FC-BGA is rapidly expanding its adoption across a wide range of industries—including consumer electronics, mobile devices, automotive, and aerospace—firmly establishing itself as a core element of semiconductor packaging. More importantly, this trend signals a shift in the axis of semiconductor performance, from the chip to packaging. Amid these changes, securing FC-BGA technologies optimized for specific applications is becoming a key determinant of corporate competitiveness.

Key to High Performance: The Evolution of Chip-toSubstrate Architecture

The essence of FC-BGA lies in how it connects the chip to the substrate. While conventional packaging methods rely on wire-based interconnections, FC-BGA adopts a flip-chip architecture, in which the die is inverted and directly attached to the substrate. 

The substrate is then connected to the mainboard through solder balls, fundamentally shortening the signal transmission path. This structural approach serves as a key differentiator, reducing signal latency while enhancing electrical performance.

This structural difference directly translates into performance. By enabling high-density input/output (I/O), FC-BGA supports efficient processing of large volumes of data while minimizing signal loss, creating an environment optimized for high-speed signal 

transmission. At the same time, its structural thermal characteristics—where heat is dissipated through both the underside of the chip and the substrate—excel in heat management, contributing to overall system stability and reliability.

Ultimately, FC-BGA represents a technology that fundamentally redesigns the data transmission architecture. Building on its structural advantages, it is rapidly extending beyond PCs and servers into AI, autonomous driving, and telecommunications infrastructure, strengthening its presence across all domains that require high performance, high-speed data processing. As system complexity increases, the role of packaging is becoming directly tied to overall performance. In this environment, FC-BGA is emerging as a key packaging technology shaping the direction of next-generation semiconductors. 

This trend is most evident in HPC, particularly in servers and PCs.

FC-BGA in Application

①  FC-BGA in PC/Server: A Key Packaging Technology Driving HPC Performance FC-BGA is a high-density package substrate that connects high-performance 

semiconductors to the mainboard and has been widely used in high-performance processors such as CPUs and GPUs. Its importance is increasing further with the growth of the AI market.

This direct chip-to-substrate architecture enhances signal integrity and enables a greater number of I/O connections by allowing terminals to be distributed across the entire 

surface of the die. This, in turn, supports faster data processing and makes it well-suited for high-performance semiconductor packaging, including CPUs, GPUs, and AI accelerators. 

As the proliferation of AI accelerators and high-end GPUs drives an increase in inter-chip data movement, I/O density and signal processing capabilities at the package level are emerging as key determinants of overall system performance. In high-speed signaling environments, both signal integrity and power integrity are critical. FC-BGA meets these requirements with fine-pitch, multi-layer substrates that minimize signal interference and ensure stable power delivery.

Currently, FC-BGA is deployed across a wide range of computing environments—including desktops, laptops, and servers—providing stable electrical connections, effective thermal management, and mechanical support. Among these, in high-performance computing environments such as data centers, large-scale data movement frequently occurs between CPUs, GPUs, and high bandwidth memory (HBM). In this process, the signal transmission performance of the package substrate serves as a critical factor in determining overall system processing speed.

② FC-BGA in Mobility: A Stable Backbone in Unpredictable Driving Conditions

FC-BGA is expanding beyond HPC into the automotive domain, where both advanced computational performance and high reliability are essential.

As advancements in AI and autonomous driving technologies expand the role of semiconductors in vehicles, the importance of high-performance System-on-Chips (SoCs) 

is increasing accordingly. In autonomous driving systems, high-performance semiconductors capable of ensuring stability and reliability are essential. As a result, package substrates are evolving toward larger form factors and higher layer counts, with a growing number of I/O connections. 

Advanced Driver Assistance Systems (ADAS) and autonomous driving systems integrate and process data from multiple sensors in real time. Any latency or error in this process can directly impact safety. In this context, stable signal transmission and reliable power delivery at the package level are essential. 

FC-BGA offers structural advantages that meet these requirements and is widely adopted in automotive semiconductors. It supports fast processing and transmission of large volumes of data generated by cameras, LiDAR, and radar, while maintaining stable performance across diverse driving conditions.

Furthermore, automotive environments are subject to significant external factors such as temperature fluctuations, vibration, and humidity, making the mechanical stability and durability of the package critical. Based on its structural characteristics that ensure reliability under these conditions, FC-BGA plays a key role across automotive electronic systems.

③ FC-BGA in Telecom: Enabling High-Speed, High-Accuracy, Low-Loss Networks

FC-BGA is expanding its presence across network infrastructure, enhancing both performance and reliability in communication systems based on improved thermal management and signal integrity. It is widely applied in base stations, transceivers, RF, and microwave applications.

Its structural, based on fine-pitch solder balls, effectively shortens external interconnect distances, minimizing signal loss and interference while enabling consistent signal transmission even in high-frequency environments. This plays a critical role in supporting high-speed data processing and precise communication performance required in networking infrastructure.

In particular, FC-BGA substrates are being used in certain 5G base stations to support the ultra-high-speed data transmission and low-latency communication required for nextgeneration networks. As networks become more distributed and edge computing continues to expand, the growing demand for high-performance base stations and network equipment is further increasing the importance of package substrates.

In communication environments that simultaneously demand high-speed data processing, high integration density, and reliability, FC-BGA is establishing itself as a core solution and expanding its share across the industry.

Key Challenges Facing FC-BGA Innovation

As the adoption of FC-BGA continues to accelerate, its structural limitations are also becoming more pronounced. In FC-BGA packages, mismatches in the coefficient of thermal expansion (CTE) between the silicon die and the organic substrate induce mechanical stress, increasing the likelihood of interconnection failures. Frequent defects can lead to reduced joint reliability, and various technical solutions developed to address these issues often come with additional cost and process complexity.

Warpage in FC-BGA packages can also adversely affect yield and reliability during the packaging process. This occurs due to heat and pressure applied to the substrate, and even slight warpage—on the order of approximately 0.1 mm—can be classified as a defect under industry standards, necessitating precise control.

Lastly, establishing FC-BGA manufacturing facilities requires large-scale investment exceeding USD 500 million, driven by the need for advanced equipment and tightly controlled environments. This creates a high barrier for companies to enter the market, potentially slowing the pace of market expansion.

Ultimately, how these challenges are addressed will serve as a key determinant of a company’s competitiveness.

LG Innotek; Pushing the Boundaries of Innovation with Advanced Technologies

LG Innotek is accelerating the expansion of its FC-BGA business through multi-faceted investments aimed at overcoming technical limitations and strengthening its competitiveness. Following the acquisition of Gumi Plant 4 in June 2022, the company began establishing FC-BGA production lines. By late 2024, it started supplying products to major North American technology companies, while concurrently securing talent to steadily reinforce its business foundation.

The “Dream Factory” at the Gumi site is a representative production hub that exemplifies this trajectory. Operated as a dedicated FC-BGA manufacturing facility, it has established an efficient production environment by automating most processes, with only essential personnel required. Covering an area equivalent to three football fields, the facility is operated by approximately 10 employees and is structured to enable production with roughly 50% of the workforce required in conventional setups. Through the Dream Factory, LG Innotek is effectively addressing key challenges, including production efficiency, technological reliability, and readiness for next-generation materials.

In addition, efforts are ongoing to address technical challenges, including the previously mentioned substrate warpage issue. LG Innotek is exploring directions optimized for AI server semiconductors based on glass substrate technology with high integration and low loss characteristics. The company has established a pilot line at the Gumi site and is advancing development with the goal of commercialization between 2027 and 2028.

Business expansion is also progressing in stages. Beginning with the mass production of PC FC-BGA for major North American technology companies, LG Innotek plans to enter the server FC-BGA market in 2026. In addition, a new site for expanding semiconductor substrate production capacity is expected to be finalized within the first half of the year, with plans to double current capacity.

Through the integrated advancement of production infrastructure, technology, and investment, LG Innotek’s FC-BGA business continues to grow steadily. As demand for semiconductor substrates accelerates in line with global investment in AI data center infrastructure, the company is expected to respond proactively to rapidly increasing market demand through preemptive investment and continued technological advancement.