Interlocking Stiffener Assembly for Semiconductor Package Warpage
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Solution Overview
Problem
Existing methods for addressing warpage issues in semiconductor packages, such as using thick integrated heat spreaders or adjusting substrate thickness, result in increased package size, weight, and material costs, while material selection for CTE mismatch control is limited in effectiveness.
Innovation Solution
A stiffener assembly comprising a corner member and frame members that interlock with each other, allowing limited movement to constrain warpage by coupling to components with varying coefficients of thermal expansion, thereby enhancing mechanical integrity and managing warpage without significantly increasing package size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick integrated heat spreaders are used to control warpage, then warpage control is improved, but package size and weight increase
Solution Approach 1:
The stiffener is divided into multiple frame members connected by movable connections, creating a segmented structure that can distribute and manage warpage forces across multiple points rather than requiring a single thick component
Solution Approach 2:
The movable connections between frame members allow the stiffener to dynamically adapt to thermal expansion and contraction, permitting controlled movement that accommodates warpage without requiring excessive material thickness
2Reliability
If substrate thickness is increased to control warpage, then warpage control is improved, but package height increases
Solution Approach 1:
Instead of controlling warpage by increasing thickness in the vertical dimension, the stiffener uses a planar framework structure that controls warpage through lateral geometry and distributed support points, managing warpage control without increasing package height
3Reliability
If material selection is optimized for CTE mismatch control, then warpage control is improved, but material availability is limited
Solution Approach 1:
The stiffener uses standard movable connection mechanisms that can be implemented with commonly available materials, changing the approach from selecting specialized materials with specific CTE properties to using geometric and mechanical parameters that work with widely available materials
4Reliability
If thick heat spreaders are used to control warpage, then warpage control is improved, but manufacturing complexity increases
Solution Approach 1:
The stiffener is segmented into multiple frame members that can be manufactured separately using standard processes and then assembled, reducing manufacturing complexity compared to producing single thick components
Solution Approach 2:
The movable connections act as intermediaries between the frame members, providing a simple mechanical interface that facilitates assembly without requiring complex joining processes
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
The stiffener assembly effectively controls warpage in semiconductor assemblies by allowing controlled movement of components, improving package reliability, ease of assembly, and extending lifespan while maintaining compact dimensions.
Implementation Method 1
The warping in the semiconductor assembly may arise due to different components of the semiconductor assembly being constructed from materials having varying coefficients of thermal expansion (CTEs)
Data Source
AI summary
There may be provided a stiffener assembly for a semiconductor package. The stiffener assembly may include a corner member and a frame member. A primary mating element of the corner member and a secondary mating element of the frame member may be configured to interlock with each other to form a connection joint that permits movement of the secondary mating element relative to the primary mating element.