Samsung finds thinner, cooler path for HBM4E AI memory

Samsung published quantitative research in the IEEE detailing its HBM4E packaging strategy, highlighting the thermal advantages of its Hybrid Copper Bonding (HCB) approach over conventional Thermo-Compression Bonding (TCB).

The research focuses on how HCB addresses heat management challenges in high-stack HBM packages. Unlike TCB, which uses micro bumps and underfill materials between layers, HCB creates direct copper-to-copper connections.

This removes materials that can increase thermal resistance and creates additional pathways for heat to escape from the memory stack, as per SemiconductorsX.

Samsung’s research team used physics-based multi-scale modeling and test chip experiments to evaluate thermal performance from chip-level structures through package and server system environments.

The validation process included HCB and TCB-based HBM test vehicles mounted alongside an ASIC test chip on a silicon interposer, followed by measurements under air-cooling conditions similar to actual server operation.

The results showed that HCB reduced hotspot junction temperatures compared with TCB, lowering the risk of thermal issues. The technology also reduced heat interference between the HBM stack and the underlying logic chip.

New Samsung tech benefits with thinner and cooler HBM4E

These changes allow both components to operate with less thermal impact on each other. Under the same cooling conditions, the improved thermal performance created additional power headroom for higher performance operation.

Samsung also found that applying HCB reduced the overall package stack height by more than 15 percent. A thinner structure can help limit heat accumulation while supporting more compact advanced packaging designs.

The findings provide technical support for Samsung’s future HBM4E production plans, particularly for 16-high and higher memory stacks used in high-performance computing systems.

The company said the predictive thermal design framework developed through the study will be used to evaluate bonding technologies and optimize next-generation HPC packaging architectures.