Semiconductor Package Expansion Structures for Potting Compound Swelling
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Solution Overview
Problem
Semiconductor packages face mechanical stresses and potential damage due to volume changes in potting compounds caused by environmental factors like temperature changes, leading to detachment and loss of insulation properties.
Innovation Solution
Incorporation of expansion structures such as thinned sections, cavities, and movable foils within the potting compound to absorb and manage volume changes, allowing for controlled expansion and shrinkage without compromising insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the potting compound is used to encapsulate the semiconductor die and carrier, then the insulation and protection are improved, but the mechanical stresses from volume changes cause detachment and cracks
Solution Approach 1:
The patent divides the potting compound into multiple layers with different properties. The first layer (closer to the semiconductor die) has lower modulus of elasticity to accommodate volume changes, while the second layer (outer layer) has higher modulus to provide structural support and insulation. This segmentation allows each layer to perform its specific function, resolving the contradiction between maintaining insulation integrity and withstanding mechanical stresses.
Solution Approach 2:
The patent applies different material properties to different regions of the potting compound. The inner layer near the semiconductor components uses a softer material (lower modulus) to locally absorb thermal expansion stresses, while the outer layer uses a harder material (higher modulus) to provide overall structural stability and insulation. This local differentiation of material quality allows the system to simultaneously achieve stress accommodation and mechanical strength.
2Stability of the object's composition
If the potting compound is made rigid to maintain structural stability, then the housing integrity is improved, but the detachment and cracks occur due to inability to accommodate volume changes
Solution Approach 1:
The potting compound is segmented into two functional layers: an inner layer with lower modulus of elasticity that provides flexibility to accommodate volume changes and maintain attachment integrity, and an outer layer with higher modulus that provides structural stability and housing integrity. This segmentation resolves the contradiction by assigning different stability requirements to different regions.
Solution Approach 2:
The patent uses a composite structure consisting of two different potting compound layers with distinct mechanical properties. The combination of a softer inner layer and a harder outer layer creates a composite material system that simultaneously exhibits both flexibility (for attachment integrity) and rigidity (for housing integrity), resolving the contradiction between these opposing requirements.
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
Enhances the lifespan of semiconductor packages by mitigating mechanical stresses and maintaining insulation integrity during temperature fluctuations.
Implementation Method 1
Expansion and shrinkage of the potting compound of a power electronic frame module, caused for example by the effect of a changing temperature
Data Source
Figure 1~2B
Figure 3A~4A
Figure 4B~5B
AI summary
A semiconductor package (10) comprising a die carrier (3), at least one semiconductor die (4) disposed on the die carrier (3), a potting compound (6) at least partially covering the die carrier (3) and the semiconductor die (4), and at least one structure (8) that is configured to withstand a change of the volume of the potting compound (6) occurring under changed external conditions in a targeted manner.