Burn-in Solder Preform with Partial Cladding for RTD Protection
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Solution Overview
Problem
Current methods for producing burn-in solder preforms for semiconductor testing are either cost-prohibitive due to excessive use of thermally conductive materials or labor-intensive, leading to inaccurate temperature readings and damage to resistance temperature detectors (RTDs) during post-production analysis.
Innovation Solution
A burn-in solder preform design featuring a thermally conductive cladding layer pre-attached to a barrier layer in a specific configuration, where the cladding layer is centered and only partially attached, allowing for reduced material usage, accurate temperature measurement, and protection of RTDs from melting and attachment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the entire preform is completely clad with thermally conductive material, then thermal conductivity is improved, but cost increases and RTD operation is interfered with
Solution Approach 1:
The patent applies local quality by providing thermally conductive cladding only in specific areas where thermal conduction is needed, rather than covering the entire preform. The barrier layer extends beyond the cladding layer at the edges, creating zones with different thermal properties - the center has high thermal conductivity while the edges maintain barrier properties to protect RTDs.
Solution Approach 2:
The preform is segmented into distinct functional zones: a central region with thermally conductive cladding for heat transfer and peripheral regions with exposed barrier layer for RTD protection. This segmentation allows each zone to perform its specific function optimally without compromising the other.
2Temperature
If the entire preform is completely clad with thermally conductive material, then thermal conductivity is improved, but RTD protection is worsened
Solution Approach 1:
The barrier layer is designed to extend beyond the cladding layer at the edges, creating a protective barrier zone that prevents thermally conductive material from contacting RTDs while maintaining thermal conductivity in the central testing area.
Solution Approach 2:
The barrier layer is positioned in advance at the edges of the preform to prevent the thermally conductive material from reaching and damaging RTDs during the burn-in process, thereby preemptively protecting the sensors.
3Manufacturing precision
If clamping mechanism is used to hold layers during assembly, then alignment is improved, but barrier layer integrity is worsened
Solution Approach 1:
The thermally conductive cladding layer is pre-attached to the barrier layer in a controlled manufacturing process before the preform is used. This preliminary attachment ensures proper alignment and eliminates the need for clamping during actual assembly, preventing barrier layer tears.
Solution Approach 2:
The pre-attached configuration creates a standardized, pre-aligned unit that can be easily transferred to the test fixture without requiring complex alignment procedures or clamping mechanisms during use.
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 design reduces material costs, prevents thermally conductive material from interfering with RTDs, and simplifies assembly while maintaining accurate temperature readings and protecting both the test equipment and semiconductor devices during high-temperature testing.
Implementation Method 1
a barrier layer to prevent thermally conductive material from adhering to a semiconductor component during burn-in testing
Implementation Method 2
a thermally conductive cladding layer attached to a portion of the barrier layer
Data Source
AI summary
Some implementations are directed to a burn-in solder preform including: a barrier layer to prevent thermally conductive material from adhering to a semiconductor component during burn-in testing; and a thermally conductive cladding layer attached to a portion of the barrier layer such that at least one dimension of the barrier layer extends past the thermally conductive cladding layer, where the thermally conductive cladding layer is attached over the barrier layer through continuous attachment or spot attachment. In some implementations, a method includes: placing the aforementioned burn-in solder preform between a test fixture and a semiconductor component; attaching a portion of the barrier layer of the burn-in solder preform to a head of the text fixture; and after attaching a portion of the barrier layer of the burn-in solder preform to the head of the test fixture, performing burn-in testing of the semiconductor component.