Double-Sided Brazed MCM Packaging for Downhole Reliability
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Solution Overview
Problem
Conventional multi-chip module (MCM) packaging technologies are not adequately reliable or efficient for high temperature and high pressure environments found in downhole applications, as they are primarily developed for consumer electronics targeting a temperature range of 0° C. to 85° C., with unknown reliability in harsh downhole conditions.
Innovation Solution
The development of new MCM packaging technologies that include double-sided active component attachment methods such as direct brazing, frame brazing, and post brazing to securely attach ceramic substrates to metal housings, along with heat sinks for medium power dissipation and 3D die stacking, and known good populated substrates, to enhance reliability and density in high temperature and pressure settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional MCM packaging is used, then the packaging is simple and easy to manufacture, but the reliability in high temperature and high pressure environments is insufficient
Solution Approach 1:
The packaging structure is divided into multiple functional layers including substrate, encapsulant material, and metal housing with separate attachment mechanisms. The double-sided attachment method segments the bonding process into first substrate attachment and second substrate attachment, allowing optimized bonding parameters for each side to improve reliability without excessive overall complexity
Solution Approach 2:
The invention transitions from conventional single-sided or planar attachment to double-sided three-dimensional attachment, bonding substrates to both the metal housing and the intermediate frame structure. This vertical stacking and multi-face bonding approach increases reliability by distributing mechanical and thermal stresses across multiple bonding interfaces rather than a single plane
2Quantity of substance
If conventional MCM packaging is used, then the manufacturing process is simple, but the packaging density is insufficient
Solution Approach 1:
The packaging structure employs nested arrangements where substrates are bonded to an intermediate frame that is itself attached to the metal housing. Components are arranged in vertically stacked configurations with electrical connections routed through multiple layers, maximizing the use of three-dimensional space within the housing to increase packaging density
Solution Approach 2:
The invention utilizes vertical stacking and multi-layer substrate arrangements bonded to both horizontal and vertical surfaces of the housing and frame structure. This transitions from two-dimensional planar packaging to three-dimensional spatial utilization, significantly increasing the quantity of components that can be packaged within the same footprint
3Stability of the object's composition
If double-sided attachment methods are used, then the thermal expansion management is improved, but the manufacturing complexity increases
Solution Approach 1:
The invention employs different bonding parameters for each substrate attachment process, optimizing temperature, pressure, and bonding material selection for each specific substrate-housing interface. This allows tailored thermal expansion compensation at each bonding interface, managing differential thermal stresses between dissimilar materials (ceramic substrates, metal housing, organic encapsulant) through parameter optimization rather than structural complexity
Solution Approach 2:
An intermediate frame structure serves as a mediator between the metal housing and the ceramic substrates, providing a transition layer that accommodates differential thermal expansion. This intermediary structure absorbs and distributes thermal stresses, protecting the brittle ceramic substrates from direct thermal shock and expansion mismatches with the metal housing
4Quantity of substance
If 3D die stacking is implemented, then the vertical packaging density is increased, but the stress management becomes more difficult
Solution Approach 1:
The vertical stack of dies is segmented into discrete bonded interfaces with intermediate bonding layers and alignment structures between each die. This segmentation allows stress isolation at each interface, preventing cumulative stress buildup through the stack. Each bonding interface can be independently optimized to manage local thermal and mechanical stresses, protecting the overall stack from stress propagation
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
These innovative packaging solutions improve the reliability and density of microelectronics in downhole tools by effectively managing thermal expansion, reducing stress, and increasing vertical packaging density, thereby enhancing the performance of high-temperature and high-pressure applications.
Implementation Method 1
double-sided active component attachment methods such as direct brazing, frame brazing, and post brazing to securely attach ceramic substrates to metal housings
Implementation Method 2
heat sinks for medium power dissipation
Implementation Method 3
effectively managing thermal expansion
Data Source
AI summary
Example packaging of microelectronics and example methods of manufacturing the same are provided herein. The packaging can enable and/or improve the use of the microelectronics in a downhole, high temperature and/or high pressure setting. The microelectronics packaging can include double-sided active components, heat sinks, and/or three-dimensional stacking of dies.