Die Stack Wire Supports for Encapsulation Bending Resistance
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Solution Overview
Problem
During IC packaging, the flexible portions of stacked dies can deform, detach, or break due to significant forces applied during the encapsulation process, leading to potential failures in the die stack.
Innovation Solution
The implementation of support structures, such as thick round or ribbon wire attached to metal pads on the substrate, which counteract bending forces applied by the molding compound, ensuring the stability of the semiconductor-die stack during encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If thin stacked dies are used to reduce physical size, then the package size is reduced, but the flexible portions become susceptible to deformation, detachment, or breakage under significant forces during encapsulation
Solution Approach 1:
The patent applies preliminary action by attaching support structures to the substrate before stacking the semiconductor dies. These support structures are positioned to provide mechanical reinforcement to the flexible portions of the die stack before encapsulation occurs, preventing deformation, detachment, or breakage during the encapsulation process while maintaining the reduced package size enabled by thin stacked dies
2Strength
If support structures are added to reinforce the die stack, then the structural strength is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing support structures only at specific locations where the die stack is most vulnerable - namely, at the flexible portions rather than uniformly across the entire structure. This localized reinforcement approach improves structural strength where needed while minimizing the addition of complex elements, thereby avoiding unnecessary increase in overall device complexity
Data Source
AI summary
A semiconductor device including one or more support structures for supporting a semiconductor-die stack having a region that overhangs a substrate. In an example embodiment, the support structures may be implemented using suitably shaped pieces of relatively thick round or ribbon wire attached to metal pads on the substrate. During the encapsulation operation, the one or more support structures may counteract a bending force applied to the semiconductor-die stack by a flow of the molding compound. At least some embodiments may beneficially be used, e.g., to enable high-yield fabrication of devices having sixteen or more stacked memory dies.