Fibrous Laminate Interface for IC Security Coatings
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Solution Overview
Problem
The finer feature sizes in high-density microelectronic integrated circuits and printed wiring assemblies pose challenges for barrier coatings, as they are vulnerable to mechanical stresses during application and operational life, and full encapsulation is hindered by flow restrictions in fine-pitch interconnects, necessitating a method for effective and efficient security-enhanced coating solutions.
Innovation Solution
A fibrous interface layer is embedded within a bond coat layer before curing, providing security by preventing reverse engineering and reducing mechanical stress, while a perimeter seal enhances performance and reduces mechanical damage, using materials like aramid, silicon carbide, or carbon fiber to form a composite formulation that matches the coefficient of thermal expansion of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barrier coatings are applied to high-density fine-featured circuit architecture, then security and protection are improved, but mechanical stress on fine metallization lines and interconnects increases
Solution Approach 1:
The patent applies composite materials by combining organic barrier coating materials with inorganic filler particles (such as silica, alumina, or titania) to create a hybrid coating system. This composite formulation provides enhanced mechanical strength and stress distribution while maintaining barrier properties, thereby protecting fine circuit features without excessive mechanical stress concentration
2Reliability
If barrier coatings are applied to encapsulate fine metallization lines, then security is improved, but coating flow through fine-pitch interconnects is restricted
Solution Approach 1:
The patent employs parameter changes by carefully controlling the rheological properties of the coating formulation, including viscosity, particle size distribution, and solvent selection. These parameter adjustments enable the coating to flow adequately through fine-pitch interconnects during application while maintaining the desired barrier properties and security features after curing
3Productivity
If finer feature sizes are used in circuit design, then circuit density is improved, but vulnerability to mechanical stress increases
Solution Approach 1:
The patent applies local quality by creating regions of enhanced mechanical protection specifically at locations where fine circuit features are most vulnerable. The coating formulation includes stress-distributing fillers and adhesive promoters that locally reinforce the coating-circuit interface, providing targeted protection to high-stress areas while maintaining overall coating integrity
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 embedded fibrous layer strengthens the bond coat, reduces mechanical stress, and enhances security by preventing reverse engineering, while the perimeter seal improves performance and reduces mechanical damage, ensuring reliable operation throughout the hardware's life cycle.
Implementation Method 1
using materials like aramid, silicon carbide, or carbon fiber to form a composite formulation that matches the coefficient of thermal expansion of the substrate
Implementation Method 2
The top coat layer includes a fibrous interface configured to provide security and strengthen the bond coat layer
Implementation Method 3
a perimeter seal enhances performance and reduces mechanical damage
Data Source
AI summary
An integrated circuit (IC) package with a fibrous interface is provided. The package includes a substrate, a bond coat and a top coat. The substrate is configured to contain IC components and connections. The bond coat layer is configured to encapsulate the IC components. The top coat layer has at least a portion embedded in the bond coat layer. Moreover, the top coat layer includes a fibrous interface configured to provide security and strengthen the bond coat layer.