IC Die Perimeter Frame for Thermal Interface Material Containment
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Solution Overview
Problem
Conventional thermal interface materials in IC assemblies are prone to migration and bleed-out, leading to reduced thermal performance and potential component failures, especially in applications with limited keep-out zones and increased positional accuracy requirements.
Innovation Solution
A frame material with high thixotropic properties is dispensed adjacent to the perimeter edge of the IC die, creating a barrier to contain thermal interface materials and prevent bleed-out, while maintaining minimal additional cost and footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermal interface pad preform is used to contain thermal interface material, then thermal performance is improved and material bleed-out is prevented, but the footprint and keep-out zone become prohibitively large
Solution Approach 1:
The patent applies a thin film barrier layer (e.g., 1-10 micrometers thick) instead of a bulky pad preform to contain the thermal interface material. This flexible thin film prevents material bleed-out while occupying minimal space, directly resolving the contradiction between containing thermal performance and minimizing footprint.
Solution Approach 2:
The patent changes the thickness parameter of the containment structure from millimeters (pad preform) to micrometers (thin film barrier), dramatically reducing the footprint while maintaining the containment function. This parameter change enables the same thermal performance with significantly reduced keep-out zone.
2Reliability
If a thermal interface pad preform is used to define a well for containing thermal interface material, then material containment is improved, but the difficulty of application and placement positional accuracy increase significantly as dimensions are reduced
Solution Approach 1:
The patent merges the barrier function with the existing assembly substrate or heat spreader by depositing the thin film barrier directly onto these surfaces. This integration eliminates the need for separate pad preform application processes, reducing manufacturing complexity even as dimensions are reduced.
Solution Approach 2:
The patent replaces the mechanical pad preform application process with a deposition process (physical vapor deposition, chemical vapor deposition, or spin coating) that creates the barrier layer. This substitution enables precise control of barrier thickness and uniformity, making the process scalable to smaller dimensions without proportionally increasing difficulty.
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
The solution effectively prevents thermal interface material bleed-out, ensuring reliable IC assembly with improved thermal performance and scalability to smaller footprints, even in applications with limited keep-out zones.
Implementation Method 1
A frame material with high thixotropic properties is dispensed adjacent to the perimeter edge of the IC die, creating a barrier to contain thermal interface materials and prevent bleed-out
Data Source
AI summary
An integrated circuit (IC) assembly comprising an IC die and a frame material that has been dispensed over the assembly substrate to be further adjacent to a perimeter edge of the IC die. The frame material may be selected to have flow properties that minimize slump, for example so a profile of a transverse cross-section through the frame material may retain convex curvature. The frame material may be cured following dispense, and upon application of a thermal interface material (TIM), the frame material may and act as a barrier, impeding flow of the TIM. The frame material may be compressed by force applied through an external thermal solution, such as a heat sink, to ensure good contact to the TIM.