Down-Set Conductive Die Pad for Thermal Management in IC Packages
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Solution Overview
Problem
Conventional semiconductor packages suffer from limited thermal conduction due to inefficient heat dissipation, leading to poor performance and reliability issues in integrated circuit devices, particularly in high-density flip chip packages where the substrate core acts as a thermal insulator, restricting heat transfer and increasing the size of the package.
Innovation Solution
A substrate with a beveled cavity and a down-set conductive die pad having tapered sidewalls is used, which provides improved thermal transfer through an exposed surface, allowing for enhanced heat dissipation and a more efficient package profile by increasing the height of die connectors and integrating heat transfer mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multilayer substrate is used to increase circuit design flexibility, then circuit design flexibility is improved, but thermal conduction path length increases which decreases heat dissipating ability
Solution Approach 1:
The patent introduces a vertical cavity structure within the substrate that extends downward from the top surface, creating a three-dimensional thermal conduction path. This allows heat to escape vertically through the cavity rather than being constrained to horizontal paths through the organic substrate core, effectively adding a new dimension to heat dissipation while preserving the multilayer circuit design flexibility.
2Temperature
If a heat spreader is attached to the backside surface of the integrated circuit, then heat removal capability is improved, but package size increases and space requirements increase
Solution Approach 1:
The patent embeds the thermal conduction cavity directly within the substrate structure itself, nesting the heat dissipation function inside the existing substrate rather than adding external components. The cavity is formed as an integral part of the substrate layers, eliminating the need for separate heat spreaders while maintaining effective heat removal capability within the same package footprint.
3Strength
If the substrate core is made of organic material for structural integrity, then structural integrity is improved, but thermal conductivity decreases acting as a thermal insulator
Solution Approach 1:
The patent segments the substrate into multiple functional layers including conductive layers and insulating layers. By dividing the substrate structure into distinct segments with different thermal properties, heat can be conducted through specific conductive pathways while the organic substrate core maintains its structural integrity. The cavity structure further segments the thermal path to bypass insulating regions.
4Ease of manufacture
If conventional substrate arrangement and fabrication process are used, then manufacturing simplicity is maintained, but thermal conduction path is severely limited
Solution Approach 1:
The patent incorporates the thermal conduction cavity into the substrate fabrication process itself, forming the cavity structure during substrate manufacturing rather than as a subsequent modification. This preliminary integration ensures that the enhanced thermal conduction path is built-in from the start, maintaining manufacturing efficiency while achieving superior thermal performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly improves thermal performance and package reliability by enabling effective heat transfer and reducing the package size, allowing for the integration of more features in smaller electronic products while maintaining manufacturing yield.
Implementation Method 1
An important function carried out by the substrate is that of dissipating heat generated by the die during operation... the substrate provides a thermal conduction path away from the die through vias connecting the substrate die pad to the heat spreader
Implementation Method 2
a substrate with a beveled cavity, attaching a down-set conductive die pad with tapered sidewalls for matching with the beveled cavity in the substrate
Data Source
AI summary
An integrated circuit package system and method of manufacture therefor includes providing a substrate with a beveled cavity, attaching a down-set conductive die pad with tapered sidewalls for matching with the beveled cavity in the substrate and having the down-set below a lower surface of the substrate, and attaching an integrated circuit over the down-set conductive die pad and electrically connected thereto.