Previously, we clarified the value logic, market growth, product stratification, and technological upgrade requirements brought about by the iteration of high-speed optical modules for PCB in the AI era, and outlined the industry dividends of high-speed motherboards and backplanes. Building on this, this article makes a key addition: the true high-value core and high-barrier track in the AI and PCB industry chain is not conventional high-speed boards, but rather IC packaging substrates, which have long been underestimated and directly determine the upper limit of high-end computing power production capacity.

It is the core support platform for AI chips, GPUs, and HBM memory. It is not only the most critical technological barrier for computing hardware, but also the most promising high-value track for domestic substitution in the current AI industry chain.

Ⅰ.Packaging Substrate: The Core Barrier to High-End PCB Development

If a regular PCB is the "skeleton" of an electronic product, then the packaging substrate is the "intimate carrier" of the chip, also known as the chip's second circuit board. It serves as the signal converter between the chip's tiny pins and the motherboard circuitry, and is an indispensable core material in the chip packaging process.

Compared to ordinary PCB, the technological barriers of packaging substrates are overwhelmingly higher. Ordinary PCB have a minimum linewidth of only 50 μm, while the advanced processes used in packaging substrates can achieve linewidths as low as 2 μm. Combined with a 2-20 layer precision stack-up structure, this necessitates the use of high-end SAP/mSAP semi-additive processes for production. This extremely high technological threshold also keeps the industry's gross profit margin stable at 30%-40%, far exceeding that of traditional PCB products.

Currently, mainstream packaging substrates are divided into two major categories: ABF and BT. The market structure is clearly defined and has long been monopolized by overseas companies.

ABF substrate is a core material essential for high-end AI computing power, with extremely high technological barriers. This material is exclusively developed in Japan and supplied globally, and with its ultra-fine wiring and multi-layer stacking capabilities, it is specifically designed for packaging high-end AI computing power chips such as GPUs and CPUs.

Japan has basically monopolized the global high-end ABF production capacity, and China has only achieved preliminary mass production verification. The localization rate of high-end AI chip adapter substrates is less than 10%, making it one of the most critical "bottleneck" tracks in the current semiconductor field.

BT substrates are geared towards the consumer semiconductor field, focusing on high heat resistance and widely used in products such as mobile SoCs, memory, and RF modules. Compared to ABF substrates, BT substrates have lower manufacturing difficulty and faster localization. Although the core substrate is still controlled by Japanese and Taiwanese companies, domestic manufacturers have achieved mass substitution, significantly reducing the pressure of technological bottlenecks.

The triple barriers of process technology, customers, and certification are the core reasons for the long-term monopoly of overseas companies. The yield ramp-up of ultra-fine circuit production is extremely difficult, and the substrate needs to be closely matched to the chip manufacturer's design. Changing suppliers requires a complete overhaul of the chip solution, resulting in extremely strong customer loyalty. Furthermore, entering the supply chain of international leaders requires a stringent 3-5 year certification cycle. The solid barriers of early entrants further enhance the scarcity of technological breakthroughs by leading domestic manufacturers.

Ⅱ.Three Core Sectors, Reshaping Industry Value

Today PCB industry has long since moved beyond the era dominated by smartphones and PCs. The traditional consumer electronics market is experiencing stagnant growth, overcapacity, and fierce competition for profits. Meanwhile, the three high-end sectors of AI servers, new energy vehicles, and 5G communications have become the core engines of industry growth, completely transforming the industry from "low-price, high-volume" to "high-price, high-value-added" models.

1.AI Servers: Highest Value, Fastest Growth

This is currently the fastest-growing and most valuable core area in the PCB industry. The global AI computing power arms race continues to escalate, and high-end servers are constantly being iterated. The PCB value of a single H100-level AI server can reach $3,000-$5,000, which is nearly 10 times that of a regular server.

High-end AI servers require ultra-high-performance multilayer boards with more than 20 layers and high-frequency, high-speed special materials, making them extremely technically demanding. As large-scale AI models continue to expand and computing power demands continue to surge, the incremental demand for high-end PCB and packaging substrates will continue to grow in the long term.

2.New Energy Vehicles: The Sector with the Largest Growth Potential

The accelerated penetration of electric and intelligent vehicles has significantly increased the value of automotive PCB per vehicle. Traditional gasoline vehicles have a simple structure, with a PCB value of only around $200 per vehicle; while new energy vehicles are equipped with core modules such as the three-electric system, intelligent cockpit, vehicle radar, and autonomous driving, directly increasing the PCB value per vehicle to $400-$600.

Meanwhile, automotive-grade products have stringent reliability and stability requirements, and the extremely high entry barrier avoids low-end competition, making automotive PCB a core track with ample incremental growth and high profitability.

3. 5G Base Station: Robust High-End Platform

Communication PCB form the foundation of the industry's stable growth. 5G base stations have a rigid demand for high-frequency, high-speed PCB; a single base station PCB can be worth $1,500-$3,000, and the unit price of the high-frequency copper-clad laminates used is 5-10 times that of ordinary boards, resulting in extremely high added value. With the recovery of the domestic 5G construction cycle and the continued advancement of forward-looking 6G technology research and development, the demand for high-end communication PCB is steadily increasing, providing continuous and robust performance support for the industry.

Ⅲ.Industry Summary

In the AI era, PCB manufacturing is no longer a low-value-added traditional industry. The core logic of the industry is clear: the inward competition for low-end board materials and the solidification of profits, coupled with Domestic Substitutes for Packaging Substrates and Surge in Three Major High-End Demands, will be the core growth drivers for the industry in the next 3-5 years.

The demand priorities are also very clear:

AI servers, with their high value and high growth rate, firmly hold the top spot; new energy vehicles follow closely behind with massive market growth; 5G communication relies on high barriers to build a solid foundation; and the industrial dividends of high-end PCB are being released at an accelerated pace.

This article comprehensively supplements the technological barriers and competitive advantages of the PCB industry, hoping to provide you with substantial reference. If you find the content useful, please like and save it! We will continue to focus on the optical communication sector, continuously updating core insights on industry iterations, technological breakthroughs, and domestic substitution, helping you to continuously seize opportunities in this field. Welcome to follow us!