According to a recent analysis, the global market for 8-inch semiconductor wafers is poised for a significant supply crunch and a corresponding price increase cycle starting in 2027. This shift is primarily driven by surging demand from AI data centers, coupled with production cuts by leading foundries and an increase in outsourced orders from Integrated Device Manufacturers (IDMs). While the industry-wide transition from 8-inch to 12-inch wafers may offer some relief, it is not expected to fundamentally alter the long-term trend of tightening supply for the smaller wafers.

AI Demand Surge and Foundry Cuts Trigger a Supply-Demand Reversal

Since the latter half of 2024, the rapid adoption of AI applications, particularly the large-scale deployment of AI data centers, has led to a swift recovery in the capacity utilization rates for 8-inch wafer foundries globally. The demand from AI servers for these wafers extends beyond power management chips to include numerous components within power supply chains and analog monitoring systems. Long-term demand is expected to grow steadily alongside applications in servers and automotive electronics. Within this demand structure, server applications—including both traditional and AI servers—are projected to show the most significant increase, accounting for an estimated 10% of total 8-inch wafer demand by 2027.

While overall demand is skyrocketing, the supply side is experiencing a deliberate contraction. Major foundries like TSMC and Samsung are prioritizing resources for advanced process nodes, which has led to a reduction in capacity for mature nodes, with 8-inch foundries being the first affected. Data indicates that global 8-inch wafer foundry capacity is forecast to decline year-over-year by 5% in 2026 and 4% in 2027. As demand for advanced foundry and packaging services continues to rise, leading manufacturers with advanced process capabilities are expected to further reduce their 8-inch capacity.

Concurrently, outsourced orders from traditional IDMs are on a gradual upward trend. Some IDMs, such as NXP Semiconductors, plan to phase out their own capacity, with plans to shutter four proprietary 8-inch foundries by 2035. Others, including Infineon and STMicroelectronics, are shifting resources toward new, wholly-owned or joint-venture 12-inch fabs, thereby releasing more 8-inch orders to external foundries. These trends are further tightening the available 8-inch foundry capacity. With demand growing and supply falling, the global supply-demand ratio for 8-inch wafers is projected to drop to -1.2% starting in 2027, indicating a supply deficit that may persist for several years.

Transition to 12-Inch Wafers Offers Limited Relief

The physical expansion of 8-inch foundry capacity faces objective constraints, as equipment suppliers have ceased production of older-generation machinery. Leading foundries have generally halted large-scale expansions for 8-inch processes. Expansions by second-tier manufacturers primarily rely on decommissioned equipment from first-tier players, with second-hand equipment being both expensive and difficult to source.

Since 2021, major foundries have encouraged clients to migrate some 8-inch products to 12-inch processes. However, progress has been relatively slow due to several factors. From a foundry cost perspective, while 12-inch processes theoretically offer cost advantages due to larger wafer size and better process uniformity, most 8-inch production lines are fully depreciated, making their actual operational costs more favorable compared to newer 12-inch lines. For design clients, migrating involves significant economic and time costs for redesign, tape-out, and product re-certification, leading to a preference to maintain existing projects where possible.

Amid the emerging risk of 8-inch shortages, design houses are expected to accelerate their focus on 12-inch processes. The 90-150nm 12-inch process nodes are forecast to gradually absorb overflow orders from the 8-inch segment in the coming years. In mainland China, companies like SMIC, Nexchip, and CanSemi, along with emerging second-tier players, have relevant capacity plans. Among Taiwanese foundries, the VSMC joint venture between Vanguard International Semiconductor and NXP in Singapore has also allocated some capacity for handling IDM orders migrating from 8-inch to 12-inch.

Considering these new capacity additions, the broader "8-inch equivalent" wafer supply-demand balance may see some alleviation. However, the rate of new supply growth is still expected to lag behind demand. Even with an accelerated migration trend, the overall industry is projected to face a "persistent tightness" scenario from 2027 to 2028.

Strong Orders and Rising Costs Point to Sustained Price Hikes from 2027

Influenced by the aforementioned trends, the 8-inch foundry segment has moved past the post-pandemic price slump that lasted until 2025, entering a demand-driven price increase cycle. Starting in the second half of 2025, Hua Hong Group and SMIC initiated price hikes for 8-inch processes, followed by Taiwanese manufacturers like Vanguard International Semiconductor and United Microelectronics Corporation (UMC). During this round, 8-inch foundry prices generally increased by 10%-15%.

As foundry capacity utilization remains high and prices rise, upstream material costs are also climbing. In the latter half of 2025, driven by demand, prices for 8-inch silicon wafers increased by approximately 10%-12%, with another round of hikes likely in the second half of 2026. Simultaneously, factors including conflicts in the Middle East and reduced output from the Democratic Republic of Congo have led to shortages and price increases for materials like resins and rare metals, subsequently driving up costs for photoresists, targets, and specialty gases. Research indicates that the direct material cost per 8-inch wafer is rising by about $4-$5 per quarter.

Under the dual pressures of sustained high capacity utilization and escalating upstream material costs, the foundry industry maintains strong motivation for further price increases. A new round of price adjustments is anticipated by late 2026 or early 2027. Given that the constraints on 8-inch capacity expansion and the structural growth in demand are unlikely to change in the short term, the upward price trend for 8-inch processes appears highly certain. Downstream end-users are advised to prepare thoroughly for a supply landscape characterized by persistent shortages and ongoing price increases for 8-inch wafers.