Conductive Straps for Stacked Electronic Packages
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Solution Overview
Problem
Conventional stacked electronic packages face challenges in reducing size and improving integration while maintaining reliable electrical connections, often relying on external contacts and plated vias which can increase package size and complexity.
Innovation Solution
The use of conductive straps with unique geometries, such as longer sides compared to width, are employed to electrically connect semiconductor dies and electronic components to substrates, providing a durable and low-resistance connection, and encapsulants are used to cover these straps and components, simplifying manufacturing and reducing stress from thermal expansion mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional external contacts and plated vias are used to connect stacked packages, then electrical connections are established, but package size increases and complexity increases
Solution Approach 1:
The patent merges the electrical connection function and mechanical support function into a single integrated conductive strap structure. The conductive straps serve both as electrical interconnects between stacked packages and as mechanical support elements, eliminating the need for separate external contacts and plated vias. This consolidation reduces package size while maintaining reliable electrical connections.
Solution Approach 2:
The patent transitions from planar external contacts to three-dimensional conductive straps that extend vertically between stacked packages. The straps are positioned in the vertical dimension within the package structure, allowing electrical connections without increasing the horizontal package footprint. This dimensional change enables compact package design while maintaining connection reliability.
2Reliability
If conventional external contacts and plated vias are used to connect stacked packages, then electrical connections are established, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the conductive strap structure, which simultaneously provides electrical connectivity, mechanical support, and thermal management pathways. This merging eliminates the need for separate external contacts, plated vias, and support structures, thereby reducing package structure complexity while maintaining connection reliability.
Solution Approach 2:
The conductive straps serve multiple functions: electrical interconnection between packages, mechanical support for stacked components, and thermal conduction pathways. This multi-functionality reduces the number of separate components needed, simplifying the overall package structure while ensuring reliable electrical connections.
3Reliability
If conductive straps with unique geometries are used to electrically connect components, then low-resistance connection is achieved, but manufacturing complexity may increase
Solution Approach 1:
The conductive straps are pre-formed with their unique geometries (such as L-shaped or T-shaped configurations) before being integrated into the package structure. This preliminary formation allows for precise positioning and orientation during assembly, ensuring optimal electrical connection quality while simplifying the manufacturing process by avoiding complex in-situ shaping operations.
4Volume of stationary object
If package size is reduced for smaller electronic devices, then density increases, but thermal management and stress from thermal expansion mismatches become more challenging
Solution Approach 1:
The patent modifies the physical parameters of the conductive straps, such as their cross-sectional area, length, and material composition, to optimize both electrical conductivity and thermal expansion characteristics. By adjusting these parameters, the straps can accommodate thermal expansion mismatches between different package components while maintaining compact package dimensions.
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 smaller package sizes, improved reliability, and reduced manufacturing costs by providing a robust, low-resistance connection between upper packages or components and substrates, while minimizing stress and simplifying the encapsulation process.
Implementation Method 1
Conductive straps each having sides, a top, and a bottom opposite the top are coupled along the bottom to the upper surface of the substrate... Each conductive strap is coupled along the top to a terminal of the passive electronic component
Implementation Method 2
An encapsulant extends over the semiconductor die, the electronic component, and the upper surface of the substrate and covers side surfaces of the substrate and the sides of the conductive straps
Data Source
AI summary
A stacked electronic package includes a substrate and conductive straps each having sides, a top, and a bottom opposite the top. Each conductive strap is coupled along the bottom to an upper surface of the substrate and is separate from others of the conductive straps. A length of at least one of the sides is greater than a width of at least another one of the sides. An encapsulant extends over the upper surface and side surfaces of the substrate and the sides of the conductive straps. A passive electronic component is disposed over the conductive straps, and each conductive strap is coupled along the top to a terminal of the passive electronic component.