Mechanically Bridged SMD Interconnects for Flexible Package Assembly
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Solution Overview
Problem
Conventional SMD interconnects are limited by their geometric design, requiring symmetry for stability and resilience during assembly, which restricts design flexibility and increases the surface area needed on the package substrate for sufficient electrical and mechanical connections.
Innovation Solution
Mechanically bridged SMD interconnects allow for simultaneous mounting of multiple interconnects on a package substrate strip, using tie bars that can be cut to isolate individual units after singulation, enabling diverse geometries and reducing the need for complex assembly equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional SMD interconnects use symmetrical geometric design for placement stability, then placement stability during assembly is improved, but design flexibility is restricted and surface area on package substrate increases
Solution Approach 1:
The interconnect structure is segmented into multiple independent interconnect regions that can be individually designed with different geometries. Each interconnect can have its own optimal shape and size, allowing design flexibility while maintaining overall structural stability through the segmented configuration.
Solution Approach 2:
The patent employs asymmetrical interconnect geometries that are optimized for specific electrical and mechanical performance requirements. By abandoning the conventional symmetrical design, the interconnects can achieve better placement stability through asymmetric weight distribution and geometry optimization, while also reducing the required surface area on the package substrate.
2Reliability
If conventional SMD interconnects use symmetrical geometric design, then resilience to machine vibration is improved, but surface area on package substrate increases
Solution Approach 1:
Different regions of the interconnect structure are given different local qualities and geometries optimized for their specific functions. Critical areas for mechanical resilience are reinforced with appropriate geometries, while non-critical areas are minimized to reduce overall surface area. This localized optimization allows the interconnect to achieve high resilience to machine vibration while occupying minimal substrate area.
3Productivity
If gang clips are used to mount large plurality of SMD interconnects simultaneously, then assembly productivity is improved, but device complexity and assembly equipment complexity increase
Solution Approach 1:
Multiple SMD interconnects are merged into a single integrated interconnect structure that can be mounted simultaneously as one component. This merging eliminates the need for complex gang clip assemblies and dedicated assembly equipment, while still achieving high productivity through simultaneous placement of multiple interconnect regions in a single assembly operation.
Data Source
AI summary
An electronic device includes a package substrate, at least one integrated circuit (IC) die including a substrate having a semiconductor surface including circuitry electrically coupled to bond pads positioned onto contact pads on a top surface of a package substrate. At least one surface mount device (SMD) component including at least a first terminal and a second terminal is on the package substrate positioned lateral to the IC die. There is at least one SMD interconnect electrically connecting to at least one of the first terminal and the second terminal to the bond pads. The SMD interconnect includes a portion of a tie bar that extends to an outer edge of the electronic device.