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About Xtacking®
Debuted in 2018,Xtacking® architecture developed by YMTC is an innovative 3D NAND technology with excellent performance
The ground-breaking technology was designed to provide enterprises and consumers with comprehensive 3D NAND related solutions.

About Xtacking®

A unique way of technical development driven by innovative practice

Independent processing on separated wafers

CMOS wafer

Memory cell wafer

Wafer bonding processing with millions of metal VIAs(Vertical Interconnect Accesses)

Into one wafer
Before the launch of Xtacking® architecture, 3D NAND architectures in the market were divided into traditional side-by-side structure and CnA (CMOS next to Array) architecture. After 9 years of development and 4 years of verification in the 3D IC field, YMTC finally bonded two wafers to 3D NAND flash memory, with innovative layouts and precise verification. Memory cells and peripheral circuits are bonded by billions of metal VIAs on a die the size of a fingernail, and the reliability of the bonding interface is tested as effectively as what is processed on a single wafer. This new technology is bound to empower 3D NAND with technical superiority and unleash its potential. 3D NAND flash memory products based on Xtacking® will provide more cost-effective and innovative options as they scale up.

9years

Development

4years

Verification

Innovative Architecture
Technology-powered Flash Memory Innovation
Celerity

Xtacking® enables DRAM-like high I/O speed

With Xtacking® , the periphery circuits as well as memory cell array are processed on two separate wafers using the logic technology node that enables the desired I/O speed and functions. Once the processing of the array wafer is completed, the two wafers are connected electrically through billions of metal VIAs (Vertical Interconnect Accesses) that are formed simultaneously across the whole wafer in one process step.
Scalability

Xtacking® enables smaller die size and higher bit density

In the conventional 3D NAND architecture, the periphery circuits take up ~20-30% of the die area, lowering NAND bit density. As 3D NAND technology continues to progress to 128 layers and above, the periphery circuits will likely take up more than 50% of the total die area. With Xtacking®, the periphery circuits are now above the array chip, enabling much higher NAND bit density than conventional 3D NAND.
Flexibility

Xtacking® : Modular approach to accelerate Time-to-Market

Xtacking® utilizes fully independent processing of the array and periphery, which offers a modularized, parallel approach to product development and manufacturing, reducing product development time by at least three months and shortening manufacturing cycle time by 20%, significantly accelerating 3D NAND time-to-market. This modular approach also opens possibilities for customized NAND flash solutions by the incorporation of innovative functionalities in the periphery.
Award-winning Xtacking®

YMTC Xtacking® technology
has won many awards in industry events around the world

In August 2025, YMTC Xtacking®4.0 technology has been honored with the Most Innovative Technology Award in the 3D NAND Flash Memory category at the Future of Memory and Storage (FMS) 2025.
On March 12, 2025, YMTC was honored with the "Annual Flash Memory Technology Innovation Award" for its Xtacking®4.0 series products, including the X4-9060, X4-9070, and X4-6080 at the CFMS | MemoryS 2025.
On March 20, 2024, YMTC's X3-6070 QLC 3D NAND, based on the Xtacking®3.0 architecture, was honored with the "Annual Technology Breakthrough Award" at the China Flash Market Summit (CFMS)2024.
On March 23, 2023, YMTC was honored with the "Best Industry Value Contribution Award" at the China Flash Market Summit (CFMS)2023.
In August 2022, YMTC's Xtacking®3.0 was honored with the Most Innovative Memory Technology Award in the category of Heterogeneous Memory Integration at the Flash Memory Summit (FMS) 2022.
In August 2018, YMTC officially launched its ground-breaking Xtacking® architecture at the Flash Memory Summit, and won the “Best of Show” award. This award is designed for the startup with the most innovation and entrepreneurship.
Constant Improvement——Xtacking®

Xtacking® will provide more added value for customers with Xtacking® architecture. This includes Higher NAND throughput, better performance at the system level, and a new business model for customized NAND solutions.
Through close cooperation with clients, business partners, and industry organizations, the memory solutions powered by Xtacking® will be widely used for data centers, enterprise-level servers, PCs, mobile devices, and other fields, which will open a new chapter of customized high-performance NAND solutions.
With ongoing investment in R&D, YMTC is committed to making each generation of products more competitive and better able to satisfy our customers.
The era of 5G, AI, and super data centers require enormous demands of the flash memory market. The mass production of 3D NAND flash memory products based on Xtacking® technology will spur the further development of the global memory market and define the future of 3D flash memory technology.

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