Major industry players led by Resonac Corporation has established JOINT3, a new consortium led by Resonac and 26 other companies from the semiconductor supply chain.

Specifically, the new alliance will jointly develop materials, equipment, and design tools optimized for panel-level organic interposers, that is semiconductor packaging technology. Accordingly, they group will utilize organic materials to create a bridge between different components on a circuit board using a prototype production line for the manufacture of 515 x 510mm panel-level organic interposers.

Resonac will establish an “Advanced Panel Level Interposer Center (APLIC)” as the main hub for this initiative within its Shimodate Plant (Minami-yuki) in Yuki City, in Japan’s Ibaraki Prefecture. APLIC will house the prototype production line, which is scheduled to commence operations in 2026.

Here, the Consortium will accelerate development efforts by delivering verification results that closely mirror real-world structures.

Transition in Manufacturing Landscape

In recent years, packaging for back-end processes has emerged as a key technology in the field of next-generation semiconductors. This includes 2.xD packages, whereby multiple semiconductor chips are arranged in parallel and connected via interposers. Demand for which is expected to grow in line with the need for increased data communication capacity and speed.

As semiconductor performance improves, interposers are becoming larger, and there is a shift from silicon interposers to organic interposers made from organic materials.

Conventional manufacturing methods involve cutting rectangular pieces from circular wafers. However, as interposers increase in size, the number of them that can be obtained from a single wafer decrease, posing a significant challenge. To address this issue, a manufacturing process that transitions from circular wafer shapes to square panel shapes is gaining attention. Because it allows for an increased number of interposers to be produced from a given area of wafer.

As leader of the JOINT3 consortium, Resonac will propose R&D priorities. It will also manage the operation of the prototype production line and drive the overall progress of the initiative. Through co-creation with participating companies, Resonac will also promote the development of materials optimized for panel-level organic interposers.

Hidehito Takahashi, President and CEO of Resonac Holdings Corporation stated “JOINT3 brings together world-class companies from a variety of fields. Combining the complementary strengths and expertise of each company allows us to collectively address challenges in areas that were previously unreachable. This endeavor goes beyond mere technological development and will lead to solutions that address societal challenges. We are excited by the potential that this initiative offers.”

Advanced Packaging for AI

Tokyo Electron Ltd. is one of the participating companies of the JOINT3. Sumie Segawa, Vice President & General Manager, Division Officer, Corporate Innovation Division of Tokyo Electron said, “Advanced packaging for AI semiconductors depends on miniaturization for high speed signaling and lower power, together with scaling for greater capacity. By combining JOINT3’s interposer technology with Japan’s superior materials and processing expertise, we will enable high quality, reliable manufacturing and jointly pursue further advances in AI semiconductors.”

On the other hand, William F. Mackenzie, Group Managing Executive Officer, Ushio Inc., another participating company, remarked, ” Advanced packaging is entering a new era, demanding innovation and collaboration across the ecosystem. As a core enabler, lithography is key to meeting these challenges. Through our Digital Lithography Technology and partnership in the JOINT3 consortium, Ushio is working with industry leaders to deliver the precision and performance the future demands.”

Resonac will leverage the knowledge gained from the semiconductor packaging technology development consortia “JOINT” and “JOINT2,” which transcend the boundaries of semiconductor equipment and materials manufacturers, as well as that sourced from “US-JOINT,” which is being developed in Silicon Valley in the United States. By doing so, Resonac aim to contribute to technological innovation in next-generation semiconductor packaging.

04 September 2025