The home and social circle of chips: The fascinating journey of PCB circuit boards

　　Deep within the core of every electronic device lies a precise "microcosm": the chip, known as the "industrial foodstuff," is the central protagonist of this world, while the printed circuit board (PCB) that carries and connects it serves as both the "foothold" for the chip to rest securely and the "social circle" for it to collaborate with other components. From the slim body of a smartwatch to the computational core of an AI server, from the auto drive system of a new energy vehicle to the signal hub of a 5G base station, the presence of PCB circuit boards is ubiquitous, silently fulfilling the crucial mission of support and connection, and unfolding a series of magical technological journeys.

　　'Home settling': PCB lays a solid foundation for chips

　　For chips that are small in size but powerful in function, finding a stable and reliable "home" is a prerequisite for performance, and PCB is the "exclusive residence" tailored for it. This board, which is based on an insulating substrate and covers copper foil circuits, provides solid physical support for chips, resistors, capacitors, and other peripheral components through precise mechanical design. During the production process, the chip is precisely soldered onto the preset solder pads on the PCB using surface mount technology (SMT). The solder pads perfectly match the chip pins, ensuring the fixed position of the chip and laying the foundation for electrical connections.

　　The "settling ability" of PCB goes far beyond simple load-bearing. The requirements for the "residence" of chips vary greatly in different application scenarios: wearable devices such as smart watches require PCBs with ultra-thin and flexible characteristics to adapt to the bending curvature of the body. The 0.05mm ultra-thin flexible PCB launched by Shijia Electronics can easily fit the contour of the wrist, allowing the chip to "settle" stably in a narrow space; PCBs in the field of automotive electronics must withstand extreme temperature changes and long-term vibrations ranging from -40 ℃ to 125 ℃. Through special substrate selection and structural design, they ensure stable residence of in vehicle chips within a 15 year service life; The chips in AI servers have been upgraded to high-level PCBs with more than 40 layers, using large-area copper plating and heat dissipation pad design to timely dissipate the huge heat generated by high-speed computing of the chips, avoiding overheating of the "residence" and affecting performance.

　　More intricately, the PCB constructs a "safety net" for the chip through solder mask and silk screen layers. Green, blue and other solder mask layers cover the surface of copper foil circuits, which not only prevent oxidation and corrosion of exposed wires, but also avoid the risk of short circuits during the welding process; The white silk screen layer clearly marks the installation position and pin polarity of the chip, providing clear guidance for assembly and maintenance, making the "settling in" process of the chip precise and efficient.

　　'Interconnection': PCB builds an efficient communication network for chips

　　If a stable 'foothold' allows chips to settle down, then the 'social circle' built by PCB enables chips to truly realize their value. The chip itself cannot independently complete complex tasks and must work in conjunction with other components such as memory, sensors, interfaces, etc. The copper foil lines etched on the PCB are like a carefully planned "highway network", providing precise channels for signal transmission and power supply between components.

　　Early PCBs were mostly single-layer boards, with simple wiring like "rural roads" that could only meet basic connection needs. With the development of electronic devices towards high performance and miniaturization, PCBs have evolved into multi-layer boards and high-density interconnect (HDI) boards, forming a three-dimensional "transportation network". Through technologies such as metalized vias, blind holes, and buried holes, PCBs have achieved interconnection and intercommunication of circuits at different levels, allowing the "communication circle" of chips to move from flat to three-dimensional. The number of layers of high-end smartphone motherboards can reach more than 10, with a line width and spacing of less than 0.1mm. A large number of micro components are arranged in an orderly manner between square inches, and high-speed signal transmission is achieved through precision circuits, supporting efficient collaboration between chips, cameras, screens, and wireless modules.

　　Driven by AI and 5G technology, the "communication demand" of chips has experienced explosive growth, and the "network building capability" of PCBs has also been upgraded. In AI servers, chips need to process massive amounts of data, and PCBs use high-frequency PTFE or ceramic substrates to reduce signal loss through impedance matching technology, ensuring high-speed and accurate data transmission. The PCB value of a single AI server has skyrocketed from the traditional 1125 yuan to over 5000 yuan; The construction of 5.5G base stations promotes the application of high-frequency flexible PCBs, and the use of modified polyimide materials for FPC transmission increases efficiency by 30%, making the "communication" between chips and antenna modules smoother. These technological breakthroughs have not only increased the capacity of the "communication circle" built on PCBs, but also achieved a qualitative leap in transmission efficiency.

　　Iterative Evolution: From Basic Carrier to Industrial Core Hub

　　The magical journey of PCB is also a history of constantly iterating and evolving technological innovations. From its initial single carrying function to becoming the core component that determines the upper limit of electronic device performance, the transformation of PCB's role is driven by the global electronics industry's trend towards high-end and intelligent development.

　　The dual drive of policy guidance and market demand has accelerated the bidding farewell of the PCB industry to "low-end competition". The industry standard conditions released by the Ministry of Industry and Information Technology in 2025 establish hard standards from three dimensions: research and development investment, intelligent manufacturing, and green production, forcing the industry to transform towards high-end. Driven by technological innovation, PCBs are constantly breaking through physical limits: the emergence of soluble PCBs provides a new path to solving the problem of electronic waste. This type of circuit board based on water-soluble polyvinyl alcohol can dissolve after soaking in room temperature water for 36 hours, and 99% of the substrate can be recycled and reused; The embedded process directly embeds the power chip into the PCB, achieving heat dissipation and system level cost reduction, and gradually blurring the "boundary" between PCB and chip.

　　Nowadays, PCBs have been deeply integrated into many fields such as automotive electronics, industrial control, medical equipment, etc., becoming an indispensable core hub in the industrial chain. In the wave of "new four modernizations" in automobiles, the amount of PCB used per vehicle has increased from 0.5 square meters in traditional fuel vehicles to over 2 square meters, with a value increase of 3-5 times, building a safe and reliable "mobile communication circle" for autonomous driving chips; In industrial control scenarios, PCBs ensure stable "socialization" of chips in harsh environments through strong and weak electrical separation design and three proof paint protection. Fubon Investment Consulting predicts that the global AI server PCB market size will increase to $10 billion by 2026, with a compound annual growth rate of over 50%. The "magical journey" of PCB is ushering in a new golden growth period.

　　From the "foothold" of chips to the "nerve center" of electronic systems, PCBs support the vigorous development of modern electronics industry with their precise structure and powerful connection capabilities. Driven by technologies such as AI, 5G, and smart cars, this magical journey will continue to extend towards thinner, more efficient, and greener directions, continuing to write a wonderful chapter that supports innovation and connects the future.