A major shift in the legacy memory market is creating an unexpected situation for the world's third-largest semiconductor foundry, UMC.
The story begins with a supply shock in the older 2D NAND flash memory market. Major players like Kioxia and Samsung are phasing out these legacy chips, specifically SLC (Single-Level Cell) and MLC (Multi-Level Cell) types. They are reallocating their resources to produce advanced 3D NAND, which is in high demand for AI servers and modern electronics. This strategic exit has created a vacuum for the many industrial, automotive, and consumer products that still rely on the reliability of older 2D NAND.
This created a clear causal chain. First, key suppliers announced End-of-Life (EOL) notices for their 2D NAND products, signaling a future supply crunch. Second, as a result, contract prices for these legacy chips began to skyrocket—climbing even faster than prices for the more modern DRAM. TrendForce projected a staggering 70-75% quarterly price jump for NAND in Q2 2026. Third, desperate for supply, customers began approaching UMC, a foundry that specializes in logic chips, not memory, to see if it could fill the gap.
However, pivoting from logic to memory manufacturing is not a simple task. UMC faces three critical bottlenecks. First is people: the specialized engineering talent for 2D NAND has either retired or moved on to 3D NAND development. Second is technology: UMC's processes are optimized for logic, and it lacks the specific process recipes and yield-tuning expertise for memory. Third is equipment: many of the tools required for planar NAND have been dismantled or sold, and acquiring and qualifying new ones would take at least one to two years.
Given these challenges, UMC's immediate strategy is not to become a memory maker overnight. Instead, it's capitalizing on the broader market tightness. The same factors driving the NAND shortage are also tightening supply for mature-node logic chips, which is UMC's core business. This has shifted bargaining power back to the foundries. UMC has already notified clients of wafer price hikes of 10-15% for its 8-inch wafers and 5-10% for its 12-inch wafers, effective in the second half of 2026.
In essence, while the prospect of entering the 2D NAND market is intriguing, the practical, near-term benefit for UMC is the increased pricing power in its existing business. A true pivot to memory production remains a possibility, but it's a story for 2027 or later.
- NAND Flash Memory: A type of non-volatile storage technology that does not require power to retain data. It's commonly found in SSDs, USB drives, and memory cards. 2D NAND is an older, planar version, while 3D NAND stacks memory cells vertically for higher density.
- Foundry: A semiconductor manufacturing plant that makes chips for other companies. Companies like Apple and NVIDIA design chips but use foundries like TSMC and UMC to fabricate them.
- SLC/MLC: Types of NAND flash. SLC (Single-Level Cell) stores one bit of data per cell and is known for its high speed and endurance. MLC (Multi-Level Cell) stores two bits per cell, offering more capacity at a lower cost but with less endurance. They are often used in industrial and automotive applications requiring high reliability.