Semiconductor Insertion Bumps for Alignment and Die Shift Prevention
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving precise alignment and mechanical registration of semiconductor devices during packaging, particularly with the integration of smaller electronic components that require smaller packages and more efficient use of space, where existing methods struggle to maintain alignment and prevent die shift during solder re-flow processes.
Innovation Solution
The implementation of semiconductor devices with insertion bumps formed over an insulating material layer, which provides mechanical registration and alignment during coupling, and includes a cap layer for solder attachment, ensuring correct alignment and reducing the risk of die shift by maintaining mechanical tolerance and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flip-chip bonding methods are used, then electrical contact is established between contact pads and packaging substrate, but alignment accuracy deteriorates and die shift occurs during solder re-flow processes
Solution Approach 1:
The bonding interface is segmented into two distinct bump types: alignment bumps that provide mechanical registration and signal bumps that provide electrical connection. This segmentation allows each bump type to be optimized for its specific function, with alignment bumps featuring larger cross-sectional areas and higher melting points for stable mechanical support during re-flow processing.
Solution Approach 2:
Alignment bumps serve as intermediary elements between the die and packaging substrate, providing a mechanical registration framework that maintains alignment accuracy throughout the solder re-flow process. These intermediary structures prevent direct reliance on signal bumps for alignment, thereby resolving the contradiction between electrical connection and alignment stability.
2Area of stationary object
If smaller electronic components are integrated to reduce package size, then area utilization improves, but mechanical registration and alignment become more difficult to maintain
Solution Approach 1:
Different regions of the bonding interface are assigned different local qualities: alignment bumps with larger cross-sectional areas and higher melting points are positioned at critical registration points, while signal bumps with smaller areas are used for electrical connections. This local differentiation allows precise mechanical registration even in compact packages with smaller components.
3Device complexity
If traditional soldering processes are used without alignment bumps, then manufacturing complexity is reduced, but alignment accuracy and structural strength deteriorate
Solution Approach 1:
The invention merges two previously separate functions into a unified bump structure: alignment bumps that simultaneously provide mechanical registration and electrical connection. By combining alignment and signaling functions in specific bump structures, the need for separate alignment features is eliminated, maintaining manufacturing simplicity while improving alignment accuracy and structural strength.
Data Source
AI summary
Semiconductor devices, methods of manufacture thereof, and semiconductor device packages are disclosed. In one embodiment, a semiconductor device includes an insulating material layer having openings on a surface of a substrate. One or more insertion bumps are disposed over the insulating material layer. The semiconductor device includes signal bumps having portions that are not disposed over the insulating material layer.