World's Fastest 3D NAND Flash memory Architecture

Next Gen Memory Architectures

NEO Semiconductor is a high-tech company focused on developing architectures for 3D NAND flash and other advanced memory technologies. 3D NAND Flash Memory is a non-volatile memory that does not require power to retain data.  It is widely used to store data, video, and music in our everyday life. The products include memory cards, USB drives, solid-state drives, smartphones, cameras, game consoles, data centers, etc. With its high density and low cost, 3D NAND flash memory has become the driving force for AI, 5G, and the cloud computing era.

X-NANDTM: World's Fastest 3D NAND Flash Memory Architecture



R/W Speed


Sequential Write Speed


Sequential Read Speed



NEO Semiconductor’s X-NAND is a revolutionary 3D NAND flash memory architecture.  Traditional 3D NAND flash memory has 2 to 4 planes in Y-direction, but X-NAND can increase the number of planes to 16 to 64 without increasing chip size.  This reduces the bit line delay to only 1/4 to 1/32 and allows 4 to 32 times more data to be transferred in parallel. The results are drastic increases in the performance of 3D NAND flash memory. 

Most Innovative Memory Technology

Most Innovative Memory Technology Award Winner - FMS 2022

Most Innovative Memory Technology Award
Winner - FMS 2022

X-NAND Gen2 that enables 3D NAND flash memory with 20X faster write performance received top honors at Flash Memory Summit 2022 – After officially announcing its groundbreaking technology, X-NAND Gen2, NEO Semiconductor captured the top prize at Flash Memory Summit 2022, winning the “Best of Show” award for the Most Innovative Memory Technology. This category addresses innovations that will change the way flash memory is used in products and raise the bar to new levels of performance, availability, endurance, scalability, and energy efficiencies.


Most Innovative Flash Memory Startup Award Winner - FMS 2020

NEO Semiconductor and X-NAND were recognized at the Flash Memory Summit 2020 conference with a Best of Show Award for “Most Innovative Flash Memory startup” for a high-performance solution that can uniquely lower cost across all tiers of SSD technologies.

What Is NAND Flash Memory?


NAND flash memory is a kind of non-volatile memory chip, which means that when computer devices of all kinds power down, the data is still there. It is widely used in smartphones, solid-state drives, USB drives, cloud, and data center storage. With smartphones, you use NAND flash memory to store thousands of photos, videos, music, and apps. Even though we don’t notice it, we are using NAND flash memory everywhere around us.

3D NAND Flash Memory

NAND Flash memory migrated from 2D to 3D process in 2014. This solved the ‘shrinkage’ bottleneck of the process technology. By building layers like a ‘skyscraper’, the density can keep increasing without process limit. Currently, 3D NAND flash has reached 176 layers and experts predicted the layers will reach 800 in the future.


2D NAND Flash Memory


3D NAND Flash Memory

Performance Degradation
of NAND Flash Memory

However, the advantages of multiple-level cells come with a price. Storing multiple bits per cell significantly slows performance because multiple read and write cycles are required to access data. For example, QLC requires 4 more read and 8 more write cycles than SLC when accessing data. Similarly, next-generation PLC will offer 5 times slower reads and 16 slower writes than SLC. This becomes a huge bottleneck for the future of NAND flash memory.



Why NAND Flash Memory
Speed Is So Critical?

Modern 5G, AI and IoT applications require very high-speed communications for huge amounts of data. This data is stored in the NAND flash memory of smartphones, robots, IoT devices, computers, cloud servers, and data centers. So, NAND flash memory speed determines data access and storage speeds. Unfortunately, each generation NAND flash memory becomes slower, creating bottlenecks for applications.

X-NANDTM Architecture

With that issue in mind, NEO Semiconductor focused its efforts on solving the performance bottlenecks. In 2018, the company made a breakthrough in 3D NAND architecture named X-NAND which can achieve SLC speeds with QLC densities. Traditional NAND flash memory has 4 planes due to the limitations of page buffer layout size. X-NAND’s innovative architecture allows the number of planes to increase to 16 to 64 planes without increasing the page buffer size. This drastically increases parallelism and reduces the bit line capacitance to achieve very high read and write speeds without increasing the chip cost.

Traditional NAND




X-NAND™ Offers Superior Performance

Compared with traditional NAND flash memory, X-NAND provides astonishing higher speed for both read and write operations. X-NAND random read and write speeds is 3X faster and sequential read and write speeds are 15X and 30X faster, respectively.


Process Compatibility

X-NAND is a circuit design change using the existing processes of 3D NAND flash memory technologies. This provides a drop-in solution for the next NAND flash memory products.