Bye Bye MLC: QLC and TLC to Be Dominant SSD Technologies Amidst AI's Ravenous Appetite for NAND — and PLC Won't Probably Happen Till the Era of Petabyte SSDs

Why It Matters

The transition reshapes supply chains, pricing and product roadmaps, forcing data‑center and OEM strategies to prioritise density‑focused SSDs while legacy MLC remains confined to high‑reliability niches.

Key Takeaways

• MLC NAND capacity drops 41.7% YoY in 2026.
• Samsung exits MLC market, final shipments mid‑2026.
• TLC and QLC become dominant for consumer, enterprise SSDs.
• PLC NAND unlikely until petabyte SSDs become viable.
• Embedded niche retains MLC demand, but volume limited.

Pulse Analysis

The NAND flash market is undergoing a rapid migration from multi‑level cell (MLC) structures toward triple‑level cell (TLC) and quad‑level cell (QLC) architectures. AI‑driven workloads, high‑resolution video, and cloud‑scale analytics are inflating capacity requirements, making the lower cost‑per‑bit of TLC and QLC attractive despite their reduced endurance. Manufacturers are now engineering controllers that mitigate wear, allowing QLC‑based SSDs to serve mainstream consumer laptops and enterprise data‑center arrays. This transition aligns with a broader industry trend of prioritising density and price efficiency over the traditional endurance advantage of MLC.

Samsung’s decision to cease MLC production by mid‑2026 removes the sector’s largest supplier, prompting Kioxia, SK Hynix and Micron to scale back to contractual minima. The abrupt capacity contraction—projected at 41.7 % YoY—has already forced OEMs to lock in long‑term purchases, driving a sharp price premium on remaining MLC stock. While this benefits the few manufacturers still offering the legacy part, it reinforces MLC’s relegation to specialized sectors such as automotive safety systems and industrial control where long qualification cycles outweigh cost concerns. Consequently, capital is being redirected toward TLC and QLC fabs, accelerating their process nodes and volume output.

Penta‑Level Cell (PLC) NAND remains a speculative frontier, with analysts estimating viability only when petabyte‑class SSDs achieve economic scale. The engineering challenges of reliably storing five bits per cell, coupled with exponential wear acceleration, keep PLC out of mainstream roadmaps until storage densities surpass 100 TB per drive. In the interim, vendors are investing in advanced error‑correction codes and 3D stacking techniques to push QLC limits further, ensuring a smoother transition for data‑center operators. Companies that anticipate the eventual PLC shift should monitor petabyte SSD pilots and align R&D budgets toward controller innovations that can tolerate higher error rates.