Flex Cable IC Bonding for Faster, Break-Resistant Packaging
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Solution Overview
Problem
The process of connecting integrated circuit dies to package substrates is resource-intensive and prone to wire breakage due to fragile bonding wires, which occupy excessive space and require complex, time-consuming bonding processes.
Innovation Solution
The use of a flex cable with conductors embedded in an insulating housing, allowing simultaneous bonding of all conductors to contacts on the integrated circuit die and package substrate, reducing the likelihood of breakage and minimizing space occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding is used to connect integrated circuit contacts to package substrate, then electrical connection is achieved, but the bonding process is time-consuming and resource-intensive
Solution Approach 1:
Multiple individual wire bonds are merged into a single flex cable assembly containing multiple conductors. The flex cable integrates multiple electrical connections into one unified component that can be bonded as a single unit, dramatically reducing the number of bonding operations required while maintaining all necessary electrical connections between the integrated circuit and package substrate
Solution Approach 2:
The electrical connections are pre-configured within the flex cable before the bonding process. The conductors are already arranged and insulated in their final configuration, allowing the bonding head to simply press and bond the pre-prepared flex cable to the contacts without performing complex individual wire bonding operations for each connection
2Manufacturing precision
If thin bonding wires are used to match contact pad size, then connection precision is improved, but wire fragility increases
Solution Approach 1:
An insulating housing or sheath is applied over the conductors to protect them while maintaining flexibility. This protective layer prevents the conductors from breaking during handling and bonding operations, while the flex cable itself remains flexible enough to conform to the contact pad layout and achieve precise alignment
Solution Approach 2:
The flex cable uses composite construction combining conductive traces on flexible substrate material with an insulating protective layer. This composite structure provides both the mechanical strength needed to prevent breakage and the electrical conductivity required for signal transmission, while maintaining the flexibility needed for precise contact alignment
3Reliability
If loop and slack are added to bonding wires to prevent breakage, then wire reliability is improved, but space occupation increases
Solution Approach 1:
The flex cable is constructed with segmented or folded sections that provide the necessary flexibility and stress relief without requiring large loops of wire. The cable can be folded back on itself or contain flexible segments that absorb mechanical stress, preventing conductor breakage while maintaining a compact overall form factor that minimizes space occupation
4Manufacturing precision
If individual wire bonding is performed for each contact, then connection precision is maintained, but manufacturing complexity increases
Solution Approach 1:
The bonding process merges multiple individual bonding operations into a single bonding action. The flex cable bonding head bonds the entire flex cable assembly to the integrated circuit contacts in one operation, eliminating the need to individually bond each wire separately. This maintains connection precision because each conductor within the flex cable is pre-positioned to align with its corresponding contact
Solution Approach 2:
The flex cable bonding head is designed as a universal bonding tool that can bond multiple conductors simultaneously to multiple contacts. This single multi-functional bonding head replaces what would otherwise require multiple separate bonding operations, simplifying the manufacturing process while maintaining the ability to achieve precise connections for each individual contact
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 method reduces connection time, minimizes wire breakage, and allows for multi-layer stacking and electromagnetic interference shielding, enhancing connectivity and efficiency.
Implementation Method 1
The thermosonic bonding head is configured to bond the first surface of the plurality of conductors to a first plurality of contacts of the integrated circuit die, and to bond the second surface of the plurality of conductors to a second plurality of contacts of the package substrate.
Data Source
AI summary
Embodiments relate to an integrated circuit package having an integrated circuit die connected to a package substrate through conductors of a flex cable. The flex cable includes an insulating housing made of an insulating material and a plurality of conductors disposed inside the insulating housing. Each conductor of the plurality of conductors is connected to a first contact of a plurality of contacts of the integrated circuit die and a second contact of a plurality of contacts of the package substrate.