Semiconductor Chip Input Output Pad Layout for TAB Packaging
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Solution Overview
Problem
Conventional semiconductor chip designs face limitations in miniaturization and increased pad density due to static electricity faults and high manufacturing costs, which restrict the number and pitch of input/output pads, leading to reduced productivity in TAB package manufacturing.
Innovation Solution
The semiconductor chip design features input pads in a central area and output pads in a peripheral area, with dummy pads and metal bumps to distribute bonding pressure uniformly, allowing for a finer pitch and increased number of pads without increasing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of input/output pads is increased to meet miniaturization and high-performance requirements, then the functionality and performance of the semiconductor chip is improved, but the pitch between pads must be reduced which causes static electricity faults between input pads
Solution Approach 1:
The invention divides the pads into two distinct groups: input pads arranged in a first pattern and output pads arranged in a second pattern. This segmentation allows input pads to be spatially separated from output pads, preventing static electricity faults while maintaining a high total number of pads. The distinct arrangement patterns for each pad type enable independent optimization of their respective layouts.
Solution Approach 2:
The invention transitions from a conventional single-edge pad arrangement to a multi-dimensional layout where input pads and output pads are distributed across different regions of the semiconductor chip. By utilizing both edges of the chip and arranging pads in different patterns, the design effectively uses the two-dimensional space more efficiently, increasing pad count without reducing pitch to fault-causing levels.
2Quantity of substance
If the pitch of input pads is reduced to increase the number of pads, then the density of pads is improved, but manufacturing precision requirements increase which reduces productivity
Solution Approach 1:
By segmenting pads into input and output groups with distinct arrangement patterns, the invention creates larger effective pitch distances within each group. This segmentation allows for coarser manufacturing tolerances while still achieving high overall pad density, as the critical high-precision requirements are relaxed within each segmented group.
Solution Approach 2:
The invention applies different arrangement patterns locally to different regions of the chip: input pads follow a first pattern optimized for their function, while output pads follow a second pattern. This local quality approach allows each region to be optimized independently, maintaining manufacturing precision within acceptable ranges while achieving high overall density.
3Area of moving object
If all pads are arranged in the peripheral area of the semiconductor chip, then the chip size can be reduced, but the number of pads that can be accommodated is limited
Solution Approach 1:
The invention utilizes the full two-dimensional area of the chip by arranging input pads and output pads in different regions and patterns. Instead of confining all pads to a single peripheral edge, the design distributes pads across multiple edges and central areas, effectively using the available chip real estate in both dimensions to maximize pad count while maintaining compact size.
Solution Approach 2:
By segmenting the pad locations into distinct input and output regions with different arrangement patterns, the invention can pack more pads into the same chip area. The segmented approach allows for more efficient space utilization compared to a uniform peripheral arrangement, as each segment can be optimized for its specific function and density requirements.
Data Source
AI summary
A semiconductor chip, having an active surface including a peripheral area and a central area, presents a connection area formed on a portion of the peripheral area. The semiconductor chip includes output pads formed in the peripheral area of the active surface and input pads formed in the central area of the active surface. The input pads may be connected to wiring patterns of a TAB tape passing over the connection area.