Foundries and OSATs Expand Overlapping Roles

The semiconductor industry is undergoing a notable transformation as Outsourced Semiconductor Assembly and Test (OSAT) companies begin to acquire capabilities traditionally held by foundries. This shift, particularly in backend activities such as 2.5D integration and panel assembly, marks a departure from the long-standing division of labor where foundries focused on front-end wafer fabrication and OSATs on assembly and testing. According to Raghu Nayak of Zeiss, OSATs are now performing roles closer to those of foundries, particularly in advanced packaging environments. This is underscored by the migration of lithography-related materials and processes from wafer fabs to OSATs, highlighting a significant industry trend.

Historically, the semiconductor industry operated in silos, with distinct roles for equipment, fabrication, design, packaging, and testing. However, as Jack Berg from Silvaco notes, connecting these disciplines is essential for making informed design decisions and enhancing manufacturing flexibility, especially at the backend. This evolution is partly driven by the industry's push towards higher interconnect density for AI and chiplet architectures, necessitating advanced packaging techniques that resemble wafer fabrication processes.

This development has strategic implications for the semiconductor supply chain. As OSATs expand their capabilities, they are positioned to absorb processes that foundries might deprioritize due to capacity constraints. Foundries, like Intel, are focusing on newer-node silicon processes, leaving legacy-node and backend processes for OSATs to handle. This shift alters the traditional supply chain dynamics, potentially increasing the strategic importance of OSATs in the semiconductor ecosystem.

Moreover, this overlap could lead to changes in how semiconductor companies allocate resources and manage partnerships. Companies might increasingly rely on OSATs for backend processes, which could shift power dynamics within the industry. This could also lead to more integrated operations, where the boundaries between design, packaging, and testing blur, allowing for more agile and adaptive manufacturing strategies.

To understand the significance of this shift, it is helpful to compare it with past industry changes. Traditionally, the semiconductor industry has seen clear demarcations between different stages of production. Foundries have been responsible for the complex and capital-intensive process of chip fabrication, while OSATs have focused on the assembly and testing phases. This separation allowed for specialization and efficiency, with each segment honing its expertise over decades.

However, the current trend mirrors past instances where technological advancements and market demands have blurred industry lines. For example, the rise of fabless semiconductor companies in the late 20th century led to the establishment of dedicated foundries and OSATs, reshaping the industry's landscape. Similarly, the current convergence of foundry and OSAT capabilities could lead to a new paradigm in semiconductor manufacturing.

Looking forward, it is likely that OSATs will continue to enhance their capabilities in advanced packaging. By 2027, we can expect more OSATs to adopt wafer-fab-style patterning processes, further integrating lithography-intensive techniques into their operations. This will likely lead to a more competitive landscape as OSATs vie for roles traditionally held by foundries.

Policy responses may also emerge as governments and industry bodies recognize the shifting landscape. Regulatory frameworks might need to adapt to address the evolving roles and responsibilities within the semiconductor supply chain. By 2028, we could see new standards and guidelines that reflect the integrated nature of modern semiconductor manufacturing.

The blurring of roles between foundries and OSATs could have wider effects on the semiconductor supply chain. For instance, equipment manufacturers might see increased demand for tools that support advanced packaging processes. This could lead to innovation in equipment design, catering to the unique needs of OSATs as they take on more sophisticated tasks.

Additionally, regions with a strong OSAT presence could benefit economically as these companies expand their capabilities. This could lead to job creation and increased investment in local economies, particularly in areas that have historically relied on semiconductor manufacturing.

In the broader context of sovereign AI and semiconductor sovereignty, these developments are crucial. By enhancing OSAT capabilities, countries could reduce dependency on traditional foundries, fostering greater national autonomy in semiconductor manufacturing. This aligns with global trends towards achieving technological sovereignty in critical sectors.

Overall, the evolving relationship between foundries and OSATs represents a significant shift in the semiconductor industry, with potential long-term implications for global supply chains and national policies. As the industry continues to adapt, stakeholders will need to navigate these changes thoughtfully to leverage new opportunities and address emerging challenges.