Semiconductor Package Test Pad Layout for Compact Reliable Probing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for high-performance, high-speed, and multifunctional semiconductor devices necessitates finer patterns and higher integration, which poses challenges in manufacturing semiconductor packages with adequate space for test pads without increasing size.
Innovation Solution
The semiconductor package incorporates miniaturized wafer test pads that are smaller than package test pads, allowing for reduced package size and efficient pad placement, while maintaining electrical connectivity through connection structures and stacked semiconductor chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test pads are made larger to ensure reliable contact with probe pins, then contact reliability is improved, but package size increases
Solution Approach 1:
The patent applies different pad sizes for different test stages: larger package test pads for final package testing and smaller wafer test pads for wafer-level testing. This local differentiation allows each test pad to be optimally sized for its specific function, ensuring reliable contact where needed while minimizing overall package size.
Solution Approach 2:
The testing process is segmented into two stages: wafer-level testing using smaller wafer test pads and final package testing using larger package test pads. This segmentation allows contact reliability to be achieved at the package level without requiring all test pads throughout the manufacturing process to be large, thus reducing the overall package size.
2Adaptability or versatility
If more space is allocated for test pads, then testing functionality is improved, but integration density decreases
Solution Approach 1:
Different regions of the semiconductor structure are allocated different pad sizes based on testing requirements: wafer test pads are placed in areas where smaller dimensions suffice for wafer-level testing, while package test pads are positioned where larger contact areas are needed for final package testing. This local quality approach maintains full testing functionality while maximizing integration density.
Solution Approach 2:
The testing functionality is segmented across two levels: wafer-level testing capabilities are provided through smaller wafer test pads, and final package testing capabilities are provided through larger package test pads. This segmentation allows comprehensive testing functionality to be achieved without requiring all test pads to occupy maximum space, thereby preserving integration density.
3Productivity
If fine patterns are implemented for high integration, then device performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements different pattern sizes for different testing functions: fine-pitched wafer test pads for wafer-level testing and coarser package test pads for final package testing. This local differentiation allows the semiconductor device to achieve high integration with fine patterns where needed while maintaining manufacturability in areas where larger patterns are acceptable, thereby reducing overall manufacturing precision requirements.
Data Source
AI summary
A semiconductor package, includes: a base chip having a front surface and a back surface opposite to the front surface, the base chip including bump pads, wafer test pads, and package test pads, disposed on the front surface; connection structures disposed on the front surface of the base chip and connected to the bump pads; and semiconductor chips stacked on the back surface of the base chip, wherein each of the wafer test pads is smaller than the package test pads.