Aligned Die Attachment Using Single-Side Fixing Walls
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Solution Overview
Problem
Orientation-sensitive electronic dies, such as magnetometers and accelerometers, often experience misalignment due to the viscosity of die-attach materials, leading to inaccurate measurements and mechanical stress when fixed on all sides, which reduces durability and performance.
Innovation Solution
The die is aligned using a single or two die-alignment walls, where one side is fixed to the alignment wall with die-attach material while the opposite side remains unfixed, utilizing capillary and surface tension forces to correct misalignment as the material solidifies, reducing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the die is fixed on all sides with die-attach material, then the die is securely attached to the support, but the die is subjected to mechanical stress from thermal expansion and misalignment occurs due to material viscosity
Solution Approach 1:
The die attachment is segmented into two distinct functions: alignment walls that provide precise positioning without fixing the die, and separate die-attach material regions that provide secure attachment. This segmentation allows the alignment walls to define the die position accurately while the attach material secures the die without causing misalignment through viscosity-driven flow.
Solution Approach 2:
The alignment walls act as intermediary structures between the support and the die. These walls provide a mechanical reference that guides die placement and maintains alignment during the attachment process, preventing the die from rotating or shifting due to die-attach material viscosity while allowing secure attachment elsewhere.
2Strength
If the die is fixed on all sides with die-attach material, then the die is securely attached to the support, but thermal expansion and structural changes subject the chip to mechanical stress reducing durability
Solution Approach 1:
The attachment structure is segmented so that only specific regions use die-attach material for securing the die, while alignment walls handle positioning. This reduces the total amount of die-attach material and creates stress-free zones that accommodate thermal expansion without transmitting mechanical stress to the die.
Solution Approach 2:
Different regions of the support structure have different functions: alignment walls provide precise positioning without mechanical stress, while localized die-attach material regions provide secure attachment only where needed. This local differentiation allows the die to be securely attached while protecting it from thermal stress.
3Strength
If die-attach material is used to attach the die, then the die is secured to the support, but the viscosity of the material causes the die to rotate and misalign before solidification
Solution Approach 1:
The alignment walls are pre-formed on the support structure before die attachment. These walls create a physical guide that determines the correct die position and orientation before the die-attach material is applied, preventing misalignment from occurring during the attachment process.
Solution Approach 2:
The alignment walls serve as intermediary structures that mediate between the support and the die during attachment. They provide a mechanical reference that constrains die placement and prevents rotation caused by die-attach material viscosity, ensuring accurate alignment while the material solidifies.
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 method ensures precise alignment of orientation-sensitive dies, enhancing measurement accuracy and reducing mechanical stress, thereby improving the durability and performance of electronic components.
Implementation Method 1
utilizing capillary and surface tension forces to correct misalignment as the material solidifies
Implementation Method 2
utilizing capillary and surface tension forces to correct misalignment as the material solidifies
Data Source
AI summary
An electronic component is provided that includes a first die, a support with a die-attachment surface and a die-aligning element that is adjacent to the die-attachment surface. The die aligning element includes a first die-alignment wall. Moreover, a first side of the first die is horizontally fixed to the first die-alignment wall with a die-attach material. The side of the first die that is opposite to the first side of the first die is horizontally unfixed.