SK hynix Develops UFS 4.1 Solution Based on 321-High NAND

• Optimized for on-device AI with best-in-class sequential reading performance, low power requirement
• Thickness reduced by 15% to fit into ultra-slim flagship smartphones
• Portfolio with world's highest 321-layer product to enhance SK hynix's leadership as full stack AI memory provider

SEOUL, South Korea, May 21, 2025 /PRNewswire/ -- SK hynix Inc. (or "the company", www.skhynix.com) announced today that it has developed UFS 4.1 solution product adopting the world's highest 321-layer 1Tb triple level cell 4D NAND flash for mobile applications.

The development comes amid increasing requirements for high performance and low power of a NAND solution product to ensure a stable operation of on-device AI. The company expects the UFS 4.1 product, optimized for AI workload, to help enhance its memory leadership in the flagship smartphone markets.

With an increase in demand for on-device AI leading to greater importance of the balance between computation capabilities and battery efficiency of a device, the mobile market is now requiring thinness and low power from a mobile device.

The latest product comes with a 7% improvement in power efficiency, compared with the previous generation based on 238-high NAND and a slimmer 0.85mm thickness, down from 1mm before, to fit into a ultra-slim smartphone.

The product also supports data transfer speed of 4300MB/s, the fastest sequential read* for a fourth-generation of UFS, while providing the best-in-class performance by also improving random read and write speed**, critical for multitasking, by 15% and 40%, respectively.  Immediate provision of the required data for on-device AI and faster running speed and the responsivity of an application are expected to enhance user experience.

SK hynix plans to win customer qualification within the year and ship in volume from the first quarter of next year. The product will be provided in two capacity types – 512GB and 1TB.

Ahn Hyun, President and Chief Development Officer, said that SK hynix plans to complete development of the 321-high 4D NAND-based SSD for both consumers and data centers within the year. "We are on track to expand our position as a full-stack AI memory provider in the NAND space by building a product portfolio with AI technological edge."

About SK hynix Inc.

SK hynix Inc., headquartered in Korea, is the world's top tier semiconductor supplier offering Dynamic Random Access Memory chips ("DRAM") and flash memory chips ("NAND flash") for a wide range of distinguished customers globally. The Company's shares are traded on the Korea Exchange, and the Global Depository shares are listed on the Luxembourg Stock Exchange. Further information about SK hynix is available at www.skhynix.com, news.skhynix.com.

SOURCE SK hynix Inc.