Advanced Packaging: China's Semiconductor IC Testing & Packaging
China dominates the global semiconductor packaging and testing (OSAT - Outsourced Semiconductor Assembly and Test) market, with Chinese companies controlling approximately 38% of global OSAT revenue. JCET (长电科技), Tongfu Microelectronics (通富微电), and TFME (天水华天) rank among the world's top 5 OSAT providers. As advanced packaging technologies like chiplets, 2.5D/3D stacking, and fan-out become critical for continuing Moore's Law improvements, China is investing heavily to close the gap with Taiwan's ASE in high-end packaging capabilities.
TL;DR
China controls 38% of global OSAT revenue via JCET, Tongfu, and TFME. Advanced packaging (chiplets, 2.5D/3D) is the new battleground as China invests to challenge Taiwan's ASE dominance in high-end packaging.
Key Insights
Global OSAT Market Share
Chinese OSAT companies collectively generate approximately $18 billion in annual revenue, representing 38% of the $47 billion global OSAT market. JCET leads as the world's third-largest OSAT with approximately $4.5 billion revenue, followed by Tongfu ($3.5B) and TFME ($2.8B). However, Taiwan's ASE remains dominant at $7.5B. China's advantage lies in cost efficiency, scale, and proximity to major fabless customers in mainland China and Taiwan.
JCET Leadership
JCET (长电科技), headquartered in Jiangyin, Jiangsu, is China's largest and the world's third-largest OSAT provider. Following its acquisition of STATS ChipPAC in 2015, JCET gained access to advanced packaging technologies including SiP, fan-out WLP, and 2.5D interposer. The company serves major customers including Qualcomm, MediaTek, Samsung, and Chinese chip designers. JCET has invested significantly in advanced packaging capacity, building new facilities in Jiangsu and Singapore for chiplet and 2.5D packaging.
Advanced Packaging Gap
While Chinese OSATs excel in traditional wire-bond and leadframe packaging, they lag 2-3 years behind ASE in the most advanced packaging technologies. Key gaps exist in 3D stacking with Through Silicon Vias (TSV), high-density fan-out packaging above 5 micron RDL, and chiplet interconnect technologies below 10 micron pitch. China's National IC Industry Investment Fund has allocated significant capital for advanced packaging R&D, with JCET, Tongfu, and research institutes collaborating on next-generation packaging platforms.
Chiplet Strategy
China views chiplets as a strategic pathway to bypass advanced lithography limitations. By packaging multiple mature-node chips together, China can achieve system-level performance competitive with monolithic advanced-node designs. The China Chiplet Industry Alliance, established in 2022, promotes domestic chiplet standards and interoperability. JCET has developed proprietary chiplet interconnect technology, and multiple Chinese design companies are adopting chiplet architectures for AI accelerators, server CPUs, and automotive chips.
Tongfu Microelectronics
Tongfu Microelectronics (通富微电), based in Nantong, Jiangsu, is China's second-largest OSAT with $3.5 billion annual revenue. The company has strong partnerships with AMD, serving as a major packaging and testing partner for AMD's Ryzen and EPYC processors. Tongfu has invested in advanced packaging including flip-chip, SiP, and 2.5D technologies. The company operates facilities in mainland China, Malaysia, and the Philippines, serving a global customer base.
Market Growth Drivers
Several factors drive growth in China's OSAT industry: increasing domestic chip production requiring more packaging capacity, demand for advanced packaging from AI and automotive chips, government subsidies and preferential policies for domestic OSATs, and rising costs at Taiwan-based competitors pushing customers to diversify supply chains. The global semiconductor packaging market is projected to reach $80 billion by 2030, with advanced packaging growing at 12% CAGR versus 3% for traditional packaging.
Side-by-Side Comparison
| Company | Country | Revenue | Rank | Advanced Packaging |
|---|---|---|---|---|
| ASE Group | Taiwan | $7.5B | #1 | Leader (3D, CoWoS) |
| Amkor | US | $6.9B | #2 | Strong (SiP, 2.5D) |
| JCET | China | $4.5B | #3 | Growing (SiP, chiplet) |
| Siliconware (SPIL) | Taiwan | $4.1B | #4 | Strong (flip-chip) |
| Tongfu | China | $3.5B | #5 | Growing (flip-chip, SiP) |
| TFME | China | $2.8B | #6 | Moderate |
| PTI | Singapore | $2.2B | #7 | Specialized |
Frequently Asked Questions
Advanced packaging is critical for China because it offers a way to achieve high chip performance without relying on the most advanced lithography equipment, which is subject to US export controls. By combining multiple mature-node dies through chiplet and 2.5D/3D packaging, China can create competitive processors, AI accelerators, and automotive chips. This 'more than Moore' approach is seen as a strategic pathway to semiconductor self-sufficiency.
Traditional packaging (wire-bond, leadframe) connects a single die to a substrate using thin gold wires, offering limited density and performance. Advanced packaging includes flip-chip (direct die-to-substrate connection), fan-out wafer-level packaging (redistributing I/O beyond die area), 2.5D (multiple dies on silicon interposer), and 3D (vertically stacked dies with TSV connections). Advanced packaging enables higher I/O density, better thermal performance, and heterogeneous integration of multiple chip types in one package.