UMC and Infineon Sign Supply Chain Decarbonization MoU to Cut Shared Emissions

Key Takeaways

• UMC and Infineon signed an MoU on March 4, 2026 to reduce greenhouse gas emissions across their shared supply chain and promote broader sustainability practices.
• The agreement centers on working with shared suppliers through workshops, knowledge sharing, and support for supplier decarbonization strategies, including science-based targets aligned with SBTi criteria.
• The move builds on both companies’ existing climate programs, including Infineon’s supplier-engagement target for 2029 and UMC’s Scope 1, 2, and 3 reduction targets for 2030.

Infineon Technologies AG and United Microelectronics Corporation announced on March 4, 2026 that they had signed an MoU aimed at reducing greenhouse gas emissions across their shared supply chain. According to the companies, the partnership is designed to create synergies in emissions reduction while also advancing sustainability practices beyond their own direct operations.

The MoU Focuses on Shared Suppliers and Science-Based Targets

Under the agreement, Infineon and UMC will actively engage shared suppliers and help them formulate and implement decarbonization strategies. The support will include workshops, knowledge sharing, and best-practice development, with the goal of encouraging suppliers to set carbon reduction targets in line with Science Based Targets initiative criteria.

Rather than treating emissions reduction as a compliance exercise limited to direct operations, both companies are signaling that supplier engagement is now a core part of long-term climate execution.

Why This Matters in the Semiconductor Supply Chain

For Infineon, the supply chain is already a major part of the emissions equation. In its 2025 sustainability reporting, the company said the greatest leverage lies in its supply chain, where the majority of emissions are generated. Infineon’s SBTi-validated target calls for  72.5% of suppliers, measured by emissions volume, to adopt science-based targets by the end of 2029, covering categories including purchased goods and services, capital goods, and upstream transportation and distribution. Infineon remains committed to CO2 neutrality for Scope 1 and 2 by 2030, alongside a 72.5% absolute reduction in Scope 1 and 2 emissions by 2030 versus 2019.

UMC has also been expanding its climate framework as its SBTi-validated targets now call for a 42% reduction in Scope 1 and 2 emissions by 2030 and a 25% reduction in Scope 3 emissions by 2030, both against a 2020 baseline, with a broader net-zero goal for 2050. UMC has also stated that it has been running a Supply Chain GHG Inventory Initiative since 2022, and that more than 400 suppliers have participated in the program to date.

Taken together, the MoU suggests that emissions reduction is moving deeper into supplier qualification, supplier development, and long-range procurement planning as climate expectations are increasingly becoming part of how strategic semiconductor relationships are managed.

A Sustainability Layer Added to an Existing Strategic Relationship

In March 2023, Infineon and UMC announced a long-term strategic cooperation agreement to expand production capacity for Infineon automotive microcontrollers using UMC’s 40nm eNVM process in Singapore. That earlier agreement was focused on manufacturing capacity for automotive demand and the new MoU adds a sustainability dimension to an already established strategic relationship.

When long-term manufacturing partners begin coordinating on supplier emissions reduction, it usually signals a more structural shift in how procurement, supplier engagement, and sustainability priorities are being aligned. This is especially relevant in semiconductors, where supply chains are global, capital-intensive, and heavily dependent on multi-tier supplier ecosystems.

So far, neither company has disclosed financial terms, a supplier list, or a quantified emissions-reduction figure tied specifically to the MoU. The announcement also does not include a detailed timeline for supplier conversion milestones beyond the broader SBTi-aligned targets already in place.

Still, the direction is clear. UMC and Infineon are positioning supply-chain decarbonization as a shared responsibility, and they are doing so through formal supplier engagement rather than high-level sustainability messaging alone.