TSMC's CoWoS packaging technology, originally a niche experiment, has become an industry standard, according to the second part of Digitimes' analysis series examining the origins and trajectory of the chip-on-wafer-on-substrate process.

The report, published by digitimes.com under the title "Behind CoWoS (part 2): How TSMC turned a niche packaging experiment into an industry standard," continues the outlet's examination of how advanced packaging moved from a specialized technical option to a central pillar of semiconductor manufacturing.

Why does CoWoS matter now?

CoWoS — chip-on-wafer-on-substrate — allows TSMC to place multiple chips side by side on a silicon interposer and connect them to a substrate. The approach gained commercial significance as logic and memory integration became a bottleneck for system performance, particularly in AI and high-performance computing accelerators.

According to the Digitimes analysis, TSMC did not initially develop CoWoS as a volume product. The technology began as an experimental packaging direction, and the foundry refined it over successive generations before customers adopted it at scale.

What does the second part cover?

The article reconstructs the internal history of the program, describing how TSMC positioned the packaging technology within its broader roadmap and how early deployment decisions shaped later demand.

Key themes the analysis addresses:

• The original scope of the CoWoS program as a limited packaging experiment
• The decisions that carried the technology from pilot use to standardized production
• The role customer demand played in accelerating adoption
• The consequences for the wider industry, as competing foundries and packaging suppliers responded to the format TSMC established

How did a packaging line become a standard?

The Digitimes account frames the transition as incremental rather than sudden. TSMC developed the process, qualified it with selected customers, and expanded capacity as design wins accumulated.

Over time, the report argues, CoWoS ceased to function as a differentiated option and became the default reference for high-end multi-chip integration — an outcome few in the industry anticipated when the project started.

The full analysis is available from Digitimes as the second installment of its CoWoS series.