Samsung Electronics has made a significant breakthrough in NAND flash stacking technology, which is expected to re-establish its technological leadership in the global memory chip market.
According to reports, Samsung Electronics has recently successfully developed the world's first 900-layer V-NAND prototype system and verified normal cell operation characteristics. This achievement signifies that Samsung has leapfrogged to the 900-layer milestone in the R&D phase, while the current highest record in mass production remains at 321 layers. Following the announcement, industry observers widely believe that Samsung has secured an advantageous position in the competition for next-generation NAND technology, while also building a higher technical barrier to counter pricing and capacity pressures from Chinese manufacturers.
Samsung is not only advancing preparations for the mass production of its tenth-generation V-NAND (V10, over 400 layers) but has also achieved a generational leap in R&D. This dual-track strategy helps solidify its long-term competitiveness in markets such as AI servers and on-device AI storage.
Dual-Wafer Bonding Breaks Physical Limits Samsung's 900-layer V-NAND accomplishment is based on its Cell Multi Bonding (CMB) technology—bonding two wafers each containing 450 layers into a single unit, thereby achieving a substantial increase in capacity within a single chip footprint.
The core logic of NAND flash lies in vertical stacking: the higher the layer count, the greater the data storage capacity per unit area, with corresponding improvements in power efficiency. This characteristic makes high-layer-count NAND a critical component for high-capacity, high-efficiency applications such as AI servers, data center SSDs, and smartphones.
However, increasing the stack layer count comes with challenges. As layers are added, wafer warpage and misalignment become core issues constraining yield. Samsung addressed the warpage problem by introducing a high-precision upper chuck design and developed a proprietary overlay correction technology to overcome alignment errors. Furthermore, the introduction of new bit-line (BL) and word-line (WL) structures has enabled the chip to reduce power consumption while achieving further size reduction.
Samsung stated that it has "verified normal cell operation characteristics" for this prototype, emphasizing that this result goes beyond a theoretical stacking demonstration and reaches a technically operational level.
SK Hynix Leads in Mass Production In the current mass production market, SK Hynix holds the highest layer count record with its 321-layer 4D NAND, leading Samsung's current mass-produced offerings. Samsung is accelerating preparations for mass production of its V10 generation products to narrow the gap on the commercialization front.
Faced with competitive pressures, the strategic value of Samsung's 900-layer prototype lies not only in the technology itself but also in the market signal it sends.
Industry insiders noted, "900-layer NAND technology is not simply triple the stacking of 300 layers; it represents a fundamental shift in the stacking process paradigm. This sends a clear message to global customers that Samsung remains a technology leader, while also imposing a constraining effect on the capacity and pricing offensives of Chinese enterprises."
From 3D Commercialization to Stacking Paradigm Evolution Samsung pioneered 3D V-NAND commercialization in 2013 and has since continued to drive process iterations to break stacking limits.
The initial approach used a "single stacking" method, completing the stack through a one-time etching of micro-holes. However, as layer counts increased, physical bottlenecks like wafer deformation and alignment difficulties became more pronounced. The introduction of CMB technology marks Samsung's transition in its process roadmap from single stacking to multi-wafer bonding, laying the technical foundation for the era of 1,000-layer NAND.
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