Remote Attachment Medium Application for IC Packaging Precision
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Solution Overview
Problem
Existing methods for applying attachment media in integrated circuit packages, such as solder or epoxy, face challenges in accurately targeting and dispensing the correct amount at the stack assembly station, leading to difficulties in achieving reliable and efficient bonding.
Innovation Solution
Applying the attachment medium, such as solder paste or epoxy, at a remote station before the leadframe or substrate is brought to the stack assembly area, allowing for better control over targeting and quantity, and eliminating the need for on-site application, thereby increasing production speed and bond quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If attachment medium is applied at the stack assembly station, then the bonding process can be performed in one location, but the targeting precision and quantity control of the attachment medium deteriorate
Solution Approach 1:
The patent divides the attachment medium application process into separate stages: pre-application at a remote station and final bonding at the stack assembly station. This segmentation allows each station to be optimized independently - the remote station for precise application and the assembly station for bonding, thereby resolving the contradiction between precision and process complexity.
Solution Approach 2:
The attachment medium is applied in advance at a remote station before the leadframe or substrate is transported to the stack assembly station. This preliminary action ensures precise targeting and quantity control is achieved at the application station, while the assembly station focuses solely on bonding, resolving the precision-control contradiction.
2Productivity
If attachment medium is applied at the stack assembly station, then the process is more integrated, but the production speed and bond quality deteriorate
Solution Approach 1:
By segmenting the process into remote application and local bonding stages, each station can operate at optimal speed and quality levels. The remote station applies medium efficiently, and the assembly station performs bonding reliably, together achieving both high productivity and bond quality.
Solution Approach 2:
The pre-applied attachment medium acts as an intermediary that bridges the remote preparation station and the local bonding station. This intermediary ensures that when bonding occurs at the assembly station, the medium is already precisely positioned and ready, enabling both fast production and high bond quality.
3Measurement precision
If attachment medium is applied remotely before assembly, then the application precision improves, but the process complexity increases
Solution Approach 1:
The patent segments the overall process into distinct functional stations: a remote application station optimized for precision and a stack assembly station optimized for bonding. This segmentation allows each station to specialize, improving measurement precision while managing complexity through functional separation rather than integration.
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 approach results in improved attachment bonds and increased production efficiency by ensuring precise application of the attachment medium, leading to enhanced component bonding and faster assembly processes.
Implementation Method 1
a die and at least one substrate to which the die is attached by an attachment medium such as solder or epoxy
Implementation Method 2
The stack is subsequently covered with heated mold compound, which cures to form a hard, box-shaped encasement around the stack
Implementation Method 3
Solder ball attachment is usually provided by reflow heating
Data Source
AI summary
A method of making an IC package having a die and a substrate that are to be attached at an attachment station including providing the die and substrate and, at a location remote from the attachment station, coating at least one of the die and a die attachment portion of the substrate with attachment medium.