SanDisk has taped out the first High Bandwidth Flash (HBF) memory die, a key step toward a new memory technology that could change how AI systems are built. The company is targeting 2027 for HBF memory samples.
What is HBF?
HBF is a memory type designed to deliver high bandwidth, similar to High Bandwidth Memory (HBM) used in AI accelerators, but built on NAND flash instead of DRAM. That distinction matters. NAND is cheaper and more scalable than DRAM, which could make HBF a cost-effective alternative for AI workloads that need massive data throughput.
Tape-out is the point where a chip design is sent to a foundry for manufacturing. It's a critical checkpoint in any chip's development, and reaching it means the design is complete enough to be turned into physical silicon. For HBF, this tape-out is the first concrete proof that the technology is moving from paper to production.
Why AI infrastructure cares
AI models are hungry for memory bandwidth. They constantly move data between compute and storage, and the bottleneck often isn't the processor—it's the memory. HBM has been the go-to solution, but it's expensive and limited by DRAM supply. HBF aims to offer similar bandwidth using NAND, which is already produced at massive scale.
If HBF delivers on its promise, it could reshape the economics of AI infrastructure. Lower memory costs would mean more affordable training and inference systems, potentially opening the door to smaller players who can't afford today's high-end hardware.
The NAND advantage
HBF leverages existing NAND technology, which is a significant advantage. NAND fabrication is mature, and the supply chain is well established. That could allow HBF to scale quickly and at lower cost than a brand-new memory type. SanDisk, which has deep experience in NAND, is betting that this familiarity will translate into a smoother path to production.
The company hasn't said when HBF will be in full production, but the 2027 sample target suggests a few more years of development. The tape-out is the first concrete step, and the next milestone will be getting those samples into the hands of partners and customers.
For now, the industry will be watching to see if HBF can live up to the hype. The technology is promising, but it still has to prove itself in real-world systems. That test begins when the first samples ship in 2027.
