The Influence of Alloy Composition and Temperature Cycling Dwell Time on the Reliability of a Quad Flat No Lead (QFN) Package
Why this work is in the frame
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Bibliographic record
Abstract
ABSTRACT The thermal fatigue performance of SnAgCu (SAC) Pb-free and SnPb eutectic solders was compared using accelerated temperature cycling (ATC). The Pb-free solder alloys were SAC405, SAC305, and SAC105. The cycling tests were performed with a 7 mm x 7 mm Quad Flat No-Lead (QFN) (BGA) test vehicle with 0/100 ºC temperature cycling using dwell times of both 10 and 60 minutes. The initial results from this study were published in an earlier paper [1]. The current paper addresses some assembly deficiencies in the previous work and presents new temperature cycling data to complete the objectives of the original study. The test results show a direct relationship between characteristic fatigue life and Ag content, with the higher Ag content alloys outperforming those with the lowest Ag content. The characteristic lifetime of the SnPb solder assemblies exceeds that of the Pb-free solders, but the characteristic lifetimes of the high Ag alloys are relatively high. As expected, there is a consistent inverse relationship between fatigue life and dwell time for all solders including the SnPb eutectic.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it