IC Substrate Corner Bracing for Solder Joint Fatigue Relief
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Solution Overview
Problem
Integrated circuits with large substrate sizes experience fatigue life reliability degradation due to coefficient of thermal expansion mismatch with circuit boards, leading to solder joint failure under the weight of heatsinks, which impairs functionality and shortens device lifespan.
Innovation Solution
Reinforcing solder joints by bracing the corners of integrated circuit substrates with corner reinforcement braces that are fixed to the circuit board and substrate, using adhesives to fill gaps and provide structural support, thereby reducing stress and strain on the joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corner reinforcement braces are added to reinforce solder joints, then reliability of solder joints is improved, but device complexity increases
Solution Approach 1:
The corner reinforcement braces are installed before the heatsink is attached to the substrate. This preliminary action allows the braces to be positioned and secured while having access to all necessary areas, preventing later access issues and ensuring proper installation before the final component (heatsink) is in place.
Solution Approach 2:
The corner reinforcement braces act as intermediary structural elements between the substrate and the heatsink. These braces transfer and distribute the mechanical loads and thermal expansion stresses from the heatsink across the substrate corners, protecting the solder joints from direct stress concentration while maintaining the functional relationship between the heatsink and substrate.
2Ease of operation
If corner reinforcement braces are installed before heatsink attachment, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The corner reinforcement braces are designed to be positioned specifically at the four corners of the substrate, which are the critical stress points. This localized positioning at specific high-stress areas provides sufficient structural reinforcement without requiring precise positioning across the entire substrate surface, reducing overall manufacturing precision requirements while maintaining effectiveness.
Solution Approach 2:
Instead of reinforcing the entire substrate surface uniformly, the solution applies reinforcement only at the critical corner regions where stress concentration occurs during heatsink attachment. This partial action approach provides adequate reinforcement for solder joint protection while simplifying the installation process and reducing precision requirements compared to full-surface reinforcement.
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 solution effectively mitigates solder joint fatigue, prolonging the functionality and lifespan of integrated circuits by reducing stress and strain, even without a heatsink, ensuring stable electrical connections.
Implementation Method 1
adhering the corner of the substrate, the circuit board, and the corner reinforcement brace to one another
Data Source
AI summary
An apparatus may reinforce solder joints by bracing corners of integrated circuit substrates. To do so, an exemplary apparatus may include (1) a substrate of an integrated circuit coupled to a circuit board and (2) at least one corner reinforcement brace coupled to the circuit board and at least one corner of the substrate. Various other apparatuses, systems, and methods are also disclosed.