Semiconductor Package Solder Paste Layout for Chip Self-Alignment
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Solution Overview
Problem
Existing semiconductor packages face challenges in achieving improved electrical characteristics due to misalignment and poor adhesion of semiconductor chips, leading to defects and reduced durability.
Innovation Solution
A semiconductor package design featuring a solder resist pattern with an alignment mark and a solder paste pattern that allows for self-alignment of semiconductor chips, utilizing a combination of first and second solder pastes to form a solder paste pattern that enhances electrical connectivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional alignment methods are used to mount semiconductor chips, then chip positioning can be achieved, but misalignment and poor adhesion occur leading to defects and reduced durability
Solution Approach 1:
The solder paste pattern is designed to automatically guide chip alignment through its asymmetric configuration. The alignment mark on the chip corresponds to a specific region of the solder paste pattern, enabling self-alignment during the mounting process without requiring additional alignment marks on the substrate or complex alignment procedures. This self-service mechanism ensures precise positioning and reliable adhesion simultaneously.
Solution Approach 2:
The solder paste pattern is pre-formed with an asymmetric design before chip mounting, creating a built-in alignment guide structure. This preliminary action prepares the mounting area with embedded alignment information, allowing the chip to be automatically positioned correctly during placement. The asymmetric solder paste pattern serves as a pre-established alignment reference that eliminates the need for separate alignment procedures.
2Manufacturing precision
If alignment marks are formed by etching and removing solder resist, then alignment positioning is achieved, but electrical characteristics are degraded
Solution Approach 1:
The invention introduces an asymmetric solder paste pattern as an intermediary element that serves dual functions: it provides alignment guidance through its asymmetric configuration and simultaneously maintains electrical connectivity. The solder paste pattern acts as a mediator between the alignment requirement and the electrical performance requirement, eliminating the need to compromise electrical characteristics for alignment purposes.
Solution Approach 2:
The asymmetric solder paste pattern performs multiple functions simultaneously: it serves as both the mounting adhesive material and the alignment reference structure. This multi-functional design eliminates the need for separate alignment marks that would compromise electrical characteristics, as the solder paste itself provides both mechanical bonding and electrical connectivity while its asymmetric shape guides precise chip positioning.
Data Source
AI summary
A semiconductor package may be provided. The semiconductor package may include a package substrate, a semiconductor chip on the package substrate, a solder resist pattern disposed between the package substrate and the semiconductor chip, the solder resist pattern having an opening region, an alignment mark disposed on the package substrate, the alignment mark in the opening region, and a solder paste pattern on a side surface of the alignment mark adjacent to the semiconductor chip, wherein the solder paste pattern is disposed between the semiconductor chip and the package substrate.