Samsung's HBM Heat Trap Patent: The Thermal Fix Unlocking Next-Gen AI Chips

💡 TL;DR: Samsung's patent US12653043B2 (granted June 9, 2026) introduces a Heat Path Block (HPB) inside high-bandwidth memory stacks, creating a dedicated thermal conduit at the exact zone where heat accumulates most in a multi-layer die column. With the global HBM market projected at $54.6 billion in 2026 and AI accelerators pushing toward 16-die stacks, solving the heat trap in HBM is the gating constraint between today's HBM4 and the memory bandwidth needed for the next generation of AI infrastructure.

HBM3665 GB/s

HBM3E1,330 GB/s

HBM42,000+ GB/s

What Samsung's patent actually claims

Patent US12653043B2, titled "Semiconductor package including heat dissipation structure" and granted by the U.S. Patent and Trademark Office on June 9, 2026, addresses a specific and stubborn problem in advanced chip stacking: heat that gets trapped deep inside a vertical column of memory dies with no efficient exit path. The patent describes a heat dissipation structure that introduces a new thermal pathway positioned directly above the primary heat source in a stacked memory package, so that heat can be conducted outward rather than building up between dies.

The core innovation is the Heat Path Block (HPB): a layer of high-conductivity material inserted at the D2D PHY interface. The D2D PHY (die-to-die physical layer) is the circuitry that connects adjacent dies in an HBM stack, and it carries the most electrical traffic of any layer in the package, making it the hottest zone. Samsung's HPB routes heat from this layer outward through a direct thermal conduit, bypassing the low-conductivity polymer substrates that normally surround the stack. Copper-based HPB (with thermal conductivity around 400 W/m·K, roughly 500 to 1,000 times higher than polymer materials) was first validated in Samsung's Exynos 2600 mobile processor, delivering a 16% reduction in thermal resistance at the die level. For HBM implementations, Samsung is adapting this into a silicon-based HPB architecture that integrates into the full memory stack design.

A 16% reduction sounds incremental until you understand just how tight the thermal budget becomes at 16 layers. That is the next problem.

Why heat becomes a crisis inside tall memory stacks

High-bandwidth memory works by stacking DRAM dies one on top of another, connected by through-silicon vias (TSVs). Each additional layer adds memory capacity and bandwidth, but also adds heat. HBM3E, today's dominant standard, uses 8H or 12H configurations (8 or 12 dies high) and delivers up to 1.33 TB/s per stack. The coming HBM4 standard targets 16H configurations at over 2 TB/s per stack.

The thermal problem is geometrical: the dies in the middle of the stack have nowhere to send their heat. The top die has a short path to the heat spreader on top of the package; the bottom die sits close to the interposer. The middle dies are sandwiched, with D2D PHY circuitry generating heat on every layer. In an 8H stack, this gradient is manageable. In a 16H stack, the temperature differential between the middle dies and the outer dies can exceed 15-20°C under sustained load, causing memory errors, performance throttling, and long-term reliability degradation.

For AI training workloads, where HBM runs at full bandwidth for hours, this is not a theoretical concern. NVIDIA's H100 and H200 GPUs each use HBM3 and HBM3E respectively; the Blackwell B200 architecture depends on HBM3E delivering up to 8 TB/s of aggregate memory bandwidth per GPU. Every generation of AI accelerators has pushed the thermal envelope of HBM further. Samsung's HPB is one answer to this constraint, but its two main competitors have taken fundamentally different paths.

Three companies, three thermal strategies

The HBM thermal problem has attracted three distinct engineering responses from the three companies that supply virtually all of the world's HBM.

Samsung (US12653043B2): The Heat Path Block places a thermally conductive structure at the D2D PHY region, achieving a 16% thermal resistance reduction. Samsung first validated this in mobile chip packaging and is now developing a silicon-based variant for HBM stacks, with mass production targeting HBM5 around 2028.

SK hynix, which holds about 62% of the current HBM market, uses what it calls Integrated Cooling Elements (ICEs): silicon-based materials that are thermally conductive but electrically insulating, inserted directly into the D2D PHY layer between the memory dies. SK hynix reports a 30% thermal resistance reduction from this approach, nearly double Samsung's validated figure. SK hynix plans ICEs for its HBM5 generation.

Micron takes a more radical approach: TSV trench cooling, where microscopic grooves are etched alongside standard TSVs and cooling fluid circulates internally. Micron holds a 2025 U.S. patent application for electrically passive cooling TSVs. Micron's approach requires the most process integration but could offer the deepest thermal improvement for extreme stack heights.

Feature	Samsung HPB	SK hynix ICEs	Micron TSV Trench
Patent reference	US12653043B2 (granted)	Filing stage	US application 2025 (pending)
Thermal resistance reduction	16%	30%	In development
Primary heat target	D2D PHY region	D2D PHY region	TSV layer (vertical)
Material approach	Silicon / Copper HPB	Silicon ICEs	Passive TSVs + fluid channels
First validation	Exynos 2600 (mobile)	HBM5 target	HBM5 target
Target generation	HBM5 (~2028)	HBM5	HBM5

These three approaches are competing in both the engineering and IP dimensions. The company that achieves the broadest patent coverage for HBM thermal management will have significant leverage in the HBM5 supply chain. That is where the patent translation angle becomes commercially important.

What this patent connects to, and what it could unlock

Samsung's HPB sits at the intersection of materials science, package architecture, and AI hardware demand. The physics underpinning it are straightforward: copper's 400 W/m·K thermal conductivity is a known quantity. What the patent contributes is the specific architectural arrangement: inserting the HPB at the D2D PHY in a configuration that maintains electrical integrity while creating a new thermal exit.

What the patent unlocks is more consequential. If Samsung can demonstrate that a 16H HBM5 stack remains thermally stable with the HPB architecture, it removes the main reliability barrier standing between HBM4 and HBM5. HBM5 is expected to deliver 4 TB/s or more per stack, roughly doubling HBM4's bandwidth. That doubles the memory throughput available to AI accelerators, which matters enormously for large language model training, multimodal inference, and scientific simulation workloads that are currently memory-bandwidth limited.

The connection to the broader innovation loop is direct: AI model demand increases memory bandwidth requirements, memory bandwidth requirements drive HBM stack height, stack height creates heat trapping, heat trapping creates demand for patents like US12653043B2, and solving the heat problem enables the next generation of AI. Each link in the chain depends on the others. Understanding where Samsung's patent fits reveals why the IP race in HBM is accelerating.

Who holds the patents, and who is threatened

Samsung leads the overall HBM patent landscape with 2,214 patent families, ahead of TSMC (1,752 families) and Intel (1,001 families), with Micron at 553 families, according to Patsnap. But raw patent counts do not tell the full story. The relevant dimension is which company holds the blocking positions in specific technical areas: thermal management for 16H stacks is one of those areas.

US12653043B2 is a U.S. patent. For Samsung to enforce its HPB architecture globally, it needs parallel filings in the key jurisdictions: Korea (KR), Europe (EPO), Japan (JP), and China (CN), each jurisdiction requiring a formally validated translation of the patent claims. A patent claim that is imprecisely translated in an EPO filing can be narrowed or invalidated in European proceedings. This is exactly where patent translation and IP translation services matter in practice: the legal scope of a patent is only as broad as its accurately translated claims in each jurisdiction.

The companies most affected by Samsung's HPB patent are SK hynix and Micron, who are racing toward HBM5 with their own thermal management approaches. If Samsung's claims are broad enough to cover HPB-adjacent architectures, it could require competitors to design around the patent or license it, adding to the IP overhead of HBM5 production.

A $54.6 billion market where thermal patents set the ceiling

The HBM market reached an inflection point in 2025 and is projected to hit $54.6 billion in 2026, up 58% year-on-year, according to Bank of America estimates. This growth is driven almost entirely by AI training infrastructure: HBM is the memory of choice for GPU-based AI workloads because of its bandwidth-per-watt advantage over standard DRAM. HBM3E currently accounts for roughly two-thirds of all HBM shipments, with HBM4 ramping through 2026 and 2027.

In this market, SK hynix holds approximately 62% of supply, Samsung around 30%, and Micron the remainder. The thermal management race is inseparable from the market share race: the company that first delivers a reliable, high-yield 16-layer HBM5 with adequate thermal management captures the AI hardware design wins for 2028. Samsung's US12653043B2 is not simply a manufacturing patent; it is a competitive position in a market where being one generation behind on memory bandwidth is commercially costly.

These stakes make it clear that thermal patents in HBM are not peripheral concerns: they set the ceiling for what the next generation of AI hardware can achieve.

Patent Key Facts at a Glance

Field	Detail
Patent Number	US12653043B2
Title	Semiconductor package including heat dissipation structure
Assignee	Samsung Electronics Co., Ltd.
Jurisdiction	United States
Grant Date	June 9, 2026
CPC Classification	H10W 70/611, H10W 70/685
Core Innovation	Heat Path Block (HPB) at D2D PHY interface
Validated Thermal Gain	16% thermal resistance reduction (Exynos 2600)
Target Application	HBM5 16-layer stacks (~2028)

So what does it mean for us?

Samsung's Heat Path Block patent is a structural innovation with layered consequences. At the most immediate level, it addresses the physical constraint that caps HBM stack heights, and by extension, the memory bandwidth available to AI accelerators. At the strategic level, it is a building block in Samsung's effort to reclaim HBM market share from SK hynix by being first to a reliable 16H HBM5 architecture.

The patent's commercial value depends on more than the engineering. Patent protection only works across borders when it is accurately filed and translated in each jurisdiction. As Samsung, SK hynix, and Micron all race to lock in their thermal management approaches ahead of HBM5 mass production, the volume of HBM-related patent filings across Korean, European, Japanese, and Chinese patent offices is rising sharply. Each filing needs precise technical translation and formal patent translation to be enforceable.

For anyone watching the AI infrastructure buildout, the takeaway is simple: the thermal physics of tall memory stacks are not an engineering footnote. They are the rate-limiting step on the road from today's HBM4 to the 4 TB/s memory bandwidth that next-generation AI models will need. Samsung's June 2026 patent is one answer to that problem, and the IP race to follow it will be worth watching closely.

FAQ

Sources: ChipClaims - HBM Stacked-Memory Packaging Portfolio (2026) | Samsung Semiconductor - HPB Tech Blog (2026) | TrendForce - HBM5 Heat Dissipation Comparison (2026) | Patsnap - HBM Patent Landscape (2026) | Presenc AI - HBM Market Share 2026

About the author

Dao Huy (Lucas) is a professional translator with over 7 years of experience in technical translation, patent translation, and IP documentation, working across English, Chinese, and French into Vietnamese. His practice centers on semiconductor, electronics, and advanced materials patents - precisely the field where a single mistranslated claim can determine whether intellectual property is enforceable in a jurisdiction. He also localizes software and technology products for Vietnamese-speaking markets.

If your organization files patents in semiconductor packaging, memory technology, or related fields and needs accurate patent translation or IP translation into Vietnamese for ASEAN markets, or needs technical documents localized for Vietnamese audiences, Dao Huy offers professional translation and localization services. Request a quote at daohuy.com.