Thermal Barrier for Probe Card Assembly Stability
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Solution Overview
Problem
Probe card assemblies used in semiconductor device testing face challenges with thermal stability, leading to increased heating or cooling times and potential misalignment of contact elements due to temperature variations, which can break electrical contact with the device under test.
Innovation Solution
Incorporating a thermal barrier above the probe card assembly to restrict thermal transfer from tester side boundary conditions, reducing heat loss or gain and maintaining consistent temperature, thereby reducing preheat times and preventing thermally induced misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the probe card assembly is designed with large mass (stiffening members, alignment assemblies) to ensure structural stability and probe alignment, then mechanical stability and alignment precision are improved, but thermal response time increases significantly, requiring longer preheat times before testing can begin
Solution Approach 1:
The probe card assembly is divided into multiple substrates (first substrate, second substrate, third substrate) that can be independently positioned and thermally managed. This segmentation allows each substrate to reach thermal equilibrium separately, reducing the overall preheat time while maintaining structural stability through the coordinated arrangement of multiple smaller components rather than one large massive structure
Solution Approach 2:
A support structure acts as an intermediary between the substrates, providing mechanical stability and alignment while allowing thermal isolation. The support structure enables the substrates to maintain precise relative positions for probe alignment without requiring the entire assembly to be thermally massive, thus reducing preheat time while preserving alignment precision
2Temperature
If the probe card assembly is heated to high temperatures (up to 150 degrees Celsius) for semiconductor device testing, then testing capability at elevated temperatures is improved, but thermal expansion and deflection occur causing misalignment of contact elements that breaks electrical contact
Solution Approach 1:
The probe card assembly uses multiple separate substrates positioned in a stacked arrangement with support structures between them. This segmentation allows each substrate to expand and contract independently at high temperatures, preventing cumulative thermal deflection that would occur in a monolithic structure, thereby maintaining probe alignment and electrical contact reliability during hot testing
Solution Approach 2:
The invention changes the structural parameters of the probe card assembly by introducing a multi-substrate configuration with support structures, altering the thermal expansion characteristics. This parameter change enables the assembly to maintain dimensional stability at elevated temperatures, preventing the misalignment and loss of electrical contact that occurs in conventional single-substrate designs
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 thermal barrier significantly reduces heating or cooling times and maintains consistent thermal stability, ensuring reliable electrical contact during semiconductor device testing by minimizing the impact of tester side boundary conditions on the probe card assembly.
Implementation Method 1
a thermal barrier disposed proximate an upper surface of the probe card assembly, the thermal barrier restricting thermal transfer between tester side boundary conditions and portions of the probe card assembly disposed beneath the thermal barrier
Data Source
AI summary
Methods and apparatus for testing semiconductor devices are provided herein. In some embodiments, an assembly for testing semiconductor devices can include a probe card assembly; and a thermal barrier disposed proximate an upper surface of the probe card assembly, the thermal barrier can restrict thermal transfer between tester side boundary conditions and portions of the probe card assembly disposed beneath the thermal barrier.