Integrated Circuit Package Top Pad Structural Stability
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Solution Overview
Problem
Conventional integrated circuit packages face issues with structural stability, heat transfer, and electromagnetic interference due to the lack of rigidity in leadframes, leading to manufacturing challenges and performance limitations.
Innovation Solution
The integration of top and bottom pads with symmetrically arranged tie bars, which provide structural integrity, improved thermal performance, and electromagnetic interference protection by extending tie bar ends beyond the encapsulant to form package leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional leadframes are used without top and bottom pads, then the package structure is simpler and manufacturing is easier, but structural stability deteriorates due to lead frame bouncing during bonding
Solution Approach 1:
The patent merges the leadframe structure with additional top and bottom pads to create an integrated stable platform. The top pad connects to the die and bottom pad, while the bottom pad connects to the leadframe, merging multiple structural elements into a unified stable assembly that prevents lead frame bouncing during bonding operations
2Temperature
If conventional single-pad leadframe structures are used, then manufacturing cost is lower, but heat transfer performance deteriorates due to insufficient thermal pathways
Solution Approach 1:
The patent transitions from a single-pad configuration to a dual-pad configuration with top and bottom pads connected through vertical interconnects. This dimensional expansion creates multiple thermal pathways from the die through the top pad, interconnects, bottom pad, and into the leadframe, significantly enhancing heat transfer performance
3Object-affected harmful factors
If conventional leadframe designs without extended tie bars are used, then the package is more compact, but electromagnetic interference shielding deteriorates
Solution Approach 1:
The patent segments the leadframe structure into distinct functional zones: top pad region, interconnect region, bottom pad region, and extended tie bar regions. The extended tie bars act as separate shielding elements that extend beyond the encapsulant to provide electromagnetic interference protection without requiring a complete increase in package volume
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 configuration enhances the structural stability, thermal performance, and electromagnetic interference shielding of integrated circuit packages, addressing the limitations of conventional designs and improving manufacturing efficiency and performance.
Implementation Method 1
Conventional lead frames generally lack structural rigidity. The finger-like or dangling portions of lead frames can be quite flimsy and difficult to hold in position.
Implementation Method 2
a hard plastic encapsulant material that covers the other components and forms the exterior of the package
Implementation Method 3
bond wires that electrically connect pads on the integrated circuit die to individual leads of the leadframe
Implementation Method 4
a portion of the die pad of the leadframe also remains exposed within the exterior extents of the package for use as a heat sink
Data Source
AI summary
An integrated circuit package system includes a bottom pad with a bottom tie bar, attaching an integrated circuit die over the bottom pad, attaching a top pad with a top tie bar, over the integrated circuit die, and applying an encapsulant wherein the top tie bar integral to the top pad, is exposed on a side of the encapsulant.