Samsung Achieves Prototype Testing of 900-Layer V-NAND, Poised to Reshape Flash Memory Competitive Landscape

Samsung Electronics has achieved a major breakthrough in NAND flash stacking technology and is expected to reestablish its technological leadership in the global memory chip market.

According to Korea Electronics News, Samsung Electronics has recently succeeded in developing the world's first 900-layer V-NAND prototype system and has verified the normal operation characteristics of its cells. This achievement means that Samsung has made a leap to the 900-layer stage in the R&D phase, while the highest layer record in mass production remains at 321 layers. After the announcement, the industry generally believes that Samsung has gained an advantageous position in next-generation NAND technology competition, while building a higher technological barrier against the price and production capacity advancements of Chinese manufacturers.

Samsung is not only preparing for the mass production of the tenth generation V-NAND (V10, over 400 layers), but also achieving leapfrog progress in R&D. This dual-track strategy helps to solidify its long-term competitiveness in AI servers and edge AI storage markets.

Dual wafer bonding breaks through physical limits

The realization of Samsung’s 900-layer V-NAND relies on "Cell Multi Bonding (CMB)" technology — combining two wafers each with 450 layers into one, thus achieving a significant increase in capacity within a single chip size.

The core logic of NAND flash is vertical stacking: the higher the number of layers, the greater the data storage per unit area, and the power efficiency improves as well. This characteristic makes high-layer NAND a key component for high-capacity, high-efficiency application scenarios such as AI servers, data center SSDs, and smartphones.

However, increasing the number of stacked layers does not come without costs. As the layer count rises, wafer warpage and misalignment become central barriers to yield. Samsung addresses warpage with its high-precision upper chuck design and overcomes misalignment with its unique "new overlay correction" technology. Additionally, the introduction of new bit line (BL) and word line (WL) structures enables further reduction in chip size while lowering power consumption.

Samsung stated that it has "verified normal cell operation characteristics" for this prototype, emphasizing that this achievement surpasses theoretical stacking demonstrations and has reached a practically operable technical level.

SK Hynix leads in mass production

Currently in the mass production market, SK Hynix holds the record with 321-layer 4D NAND, ahead of Samsung's existing mass production products. Samsung is accelerating its preparations for mass production of the V10 generation product to narrow the gap commercially.

Facing threats from competitors, the strategic value of Samsung's 900-layer prototype lies not only in its technology but also in the market signals it sends.

Industry insiders pointed out: "900-layer NAND technology is not simply three times the 300-layer stack, but a fundamental revolution in stacking process paradigms. This sends a clear message to global customers that Samsung remains the technology leader, while constraining the capacity and price onslaught from Chinese companies."

From 3D commercialization to stacking paradigm evolution

Samsung took the lead in commercializing 3D V-NAND in 2013 and has continuously pushed for process iterations to break through stacking limits.

The early "single-stack" method achieved stacking through single etching of micro-holes, but as the number of layers increased, physical bottlenecks such as wafer deformation and alignment difficulties became more apparent. The introduction of CMB technology marks Samsung's paradigm shift from single stacking to multi-wafer bonding, laying the technical foundation for the era of 1000-layer NAND.

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