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The printed circuit board (PCB) industry chain is very long and highly specialized, clearly divided into three main segments: upstream raw materials, midstream manufacturing, and downstream applications, along with the supporting equipment and software.
1. Upstream: Raw materials and substrate suppliers: This is the starting point of the entire industry, providing the basic materials needed for PCB manufacturing. Price fluctuations and technological advancements directly affect the costs and product performance of the midstream manufacturing sector.1.1. Copper-clad laminate (CCL): The core substrate of PCBs, made by impregnating reinforcing materials (such as fiberglass cloth) with resin (such as epoxy resin), with one or both sides covered with copper foil, and formed through hot pressing.Copper foil: The conductive layer, divided into rolled copper foil and electrolytic copper foil.Resin: Such as epoxy resin, polyimide (PI), PTFE, etc., determines the board’s thermal resistance, dielectric constant, and other properties.Reinforcing materials: Mainly glass fiber cloth (E-glass), providing mechanical strength and stability.Others: Such as wood pulp paper (used for low-cost boards like FR-1, FR-2), fillers, etc.1.2. Chemicals: Various electroplating, etching, cleaning, and other processes used in PCB production.Electroplating chemicals: Copper balls, copper sulfate, nickel gold solution, tin salts, etc.Etching chemicals: Etching solution (acidic/alkaline), stripping solution, etc.Photoresist: Dry film (the largest proportion), wet film, photoinitiators, etc.Other auxiliary chemicals: Developer, stripping solution, cleaning agents, etc.1.3. Other raw materials:Drilling pads/covers: Used to protect the board surface and ensure hole position accuracy during mechanical drilling.Metal anodes: Such as phosphor copper anode balls/angles used for circuit electroplating.Inks: Solder mask ink (green is the most common), text ink, etc.Main upstream companies include:Copper-clad laminate: Kingboard Chemical (the largest globally), Shengyi Technology (domestic leader), Nan Ya Plastics, Taiyo Yuden, Jinan Guojin, etc.Copper foil: Kingboard Chemical, Nordson Corporation, Jiayuan Technology, Changchun Chemical, etc.Chemicals: Atotech, Dow Chemical, DuPont, Shanghai Xinyang, Guanghua Technology, etc.Dry film: DuPont, Changchun Chemical, Hitachi Chemical, Taiwan Changxing Materials, etc.
2. Midstream: PCB manufacturing and assembly: This is the core of the industry chain, processing raw materials into final PCB products. Depending on the technical complexity and product type, it can be divided into several subfields.2.1. PCB manufacturing (bare board production):Single/double-sided boards: Lower technical threshold, mainly used in low-end consumer electronics, home appliances, lighting, etc.Multilayer boards: The most widely used, 4-8 layer boards are mainstream, used in communications, automotive electronics, industrial control, medical devices, etc.High-density interconnect boards (HDI): Using blind and buried vias and other technologies, with smaller line widths and spacings, and higher density. Mainly used in smartphones, tablets, wearable devices, and other space-constrained electronic products.Flexible boards (FPC): Made from polyimide or polyester film, can be bent and folded. Mainly used for display connections (OLED), camera modules, keyboards, foldable phone hinges, etc.Packaging substrates (IC Substrate): The pinnacle of technology, used for chip packaging, connecting chips to PCBs. Line widths and spacings are extremely fine (micron level), requiring high precision and reliability. Mainly used for high-end chips like CPUs, GPUs, and FPGAs.High-frequency and high-speed boards: Made from special materials (such as PTFE) to ensure the integrity of high-frequency signal transmission. Mainly used in 5G base stations, satellite communications, radar, high-end servers, etc.Metal substrates (thick copper boards): Excellent heat dissipation, mainly used in LED lighting, power modules, automotive headlights, etc.2.2. Electronic assembly (PCBA / SMT): Midstream manufacturers or specialized foundries (EMS) mount and solder components such as chips, resistors, and capacitors onto the manufactured PCB bare boards, forming complete circuit function modules.Main midstream manufacturing companies include:Comprehensive giants: Pengding Holdings (global revenue leader, strong in FPC and SLP), Zhen Ding Technology, Xinxing Electronics (strong in packaging substrates), TTM Technologies, Xunda Technology.Domestic leaders: Shenzhen Circuit (strong in communication boards, packaging substrates), Huadian Co., Ltd. (strong in communication boards, automotive boards), Jingwang Electronics (diversified layout), Dongshan Precision (strong in FPC, acquired Mflex), Shenghong Technology.Packaging substrates: Xinxing Electronics, Jingshuo Technology, Nan Ya Circuit Board, Shenzhen Circuit, Xingsen Technology.FPC: Pengding Holdings, Dongshan Precision, Hongxin Electronics, Nippon Mektron, Taijun Technology.3. Downstream: End application fields: PCBs are known as the “mother of electronic products”; almost all electronic devices rely on them. Downstream demand is the core driving force behind the development of the entire industry.3.1. Communication field (largest market):Wireless infrastructure: 5G/6G base station AAU, BBU, antenna boards, optical transmission equipment, etc. (high-frequency and high-speed boards, multilayer boards).Terminal devices: Smartphones (HDI, SLP, FPC), routers, switches, etc.3.2. Computers and data centers: Servers, high-end computers (multilayer boards, high-frequency and high-speed boards), storage devices, GPU acceleration cards, etc.3.3. Consumer electronics: Home appliances, smart homes, game consoles, drones, wearable devices (FPC, HDI), etc.3.4. Automotive electronics (high growth):
- Electrification: Battery management systems (BMS), motor controllers, on-board chargers (OBC) (multilayer boards, thick copper boards).
- Intelligence: ADAS (advanced driver-assistance systems), smart cockpits, radar sensors, camera modules (HDI, high-frequency boards).
3.5. Industrial and medical: Industrial control equipment, instruments, medical imaging equipment (CT, MRI), ventilators, etc. (requiring high reliability, multilayer boards).3.6. Aerospace and military: Extremely high requirements for PCB reliability, environmental resistance, and lifespan.4. Supporting industries: Equipment and software: Provide tools and equipment for PCB design and manufacturing, which are key to technological upgrades in the industry.4.1. Design software (EDA): Major vendors: Cadence, Mentor Graphics (Siemens EDA), Zuken, Altium, etc.4.2. Production and testing equipment:
- Laser Direct Imaging (LDI) equipment: Replaces traditional film exposure with higher precision.
- Mechanical/laser drilling machines: Used to form conductive holes.
- Electroplating equipment: Used for hole metallization and line thickening.
- Etching machines: Used to form the final circuit patterns.
- Optical inspection equipment (AOI/AXI): Automatically detects circuit defects.
- Presses: Used in the lamination process.
- Testing equipment: Flying probe testers, bed-of-nails testers.
- Main manufacturers: Orbotech (Israel), Hitachi (Japan), Schmoll (Germany), Teradyne (USA), Han’s Laser (China), Dongwei Technology, etc.
Summary of industry chain characteristics:
Technology-driven: Downstream electronic products are continuously evolving towards miniaturization and high performance, continuously driving PCB technology iterations (e.g., HDI→SLP).
Heavy asset investment: Production line equipment is expensive, especially for high-end PCBs and packaging substrate production lines.
Regional concentration: The manufacturing focus has shifted from Europe, America, and Japan to mainland China, which accounts for more than half of the global PCB output value, especially forming a complete industrial cluster in the Pearl River Delta and Yangtze River Delta regions.
Cost-sensitive: Upstream raw material costs (especially copper and fiberglass cloth) account for a high proportion, and the manufacturing industry has a high demand for cost control.
Warm reminder: The stock market has risks, and investment requires caution. The content written in this article is for reference only and represents personal research viewpoints. Stock friends should think and analyze the stock market themselves.
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