Column Electrode Height Design for Solder Electromigration
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Solution Overview
Problem
The existing connection structures in electronic apparatuses suffer from unbalanced electron density at the interface between the metallic joining portion and the solder, leading to electromigration, which degrades the electric connection and reduces the reliability of the electronic apparatus.
Innovation Solution
The connection structure is designed with a column electrode where the height of the column electrode is greater than or equal to the width of the connecting portions, ensuring balanced electron density and reducing electromigration by evenly distributing electrons across the interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the column electrode height is increased to equalize electron density, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by specifically setting the column electrode height to be equal to or greater than the connecting portion width. This dimensional parameter adjustment equalizes the electron density distribution at the solder interface, preventing electromigration and improving connection reliability without requiring complex additional structures.
2Duration of action of stationary object
If the column electrode height is increased to reduce electromigration, then durability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes a clear dimensional relationship (column electrode height ≥ connecting portion width) that provides a manufacturable specification. This parameter setting ensures sufficient electron density equalization to prevent solder electromigration and extend solder layer longevity, while maintaining achievable manufacturing precision through a straightforward geometric constraint.
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 design effectively equalizes the current density within the column electrode, thereby restricting electromigration and enhancing the reliability and longevity of the solder layer, thus improving the overall reliability of the electronic apparatus.
Implementation Method 1
a second connecting portion connected to another end of the column electrode via solder
Implementation Method 2
unbalanced electron density at the interface between the metallic joining portion and the solder, leading to electromigration
Implementation Method 3
equalizes the current density within the column electrode
Data Source
AI summary
A connection structure includes a column electrode; a first connecting portion connected to one end of the column electrode; and a second connecting portion connected to another end of the column electrode via solder, wherein a height of the column electrode is a width of the first connecting portion or greater.