Failure Mechanism of SAC 305 and SAC 405 in Harsh Environments and Influence of Board Defects Including Black Pad
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
ABSTRACT In this study, accelerated thermal cycling has been performed on a test vehicle including BGAs, CSPs, LGAs, LQFPs, and MLF20s. They were assembled on ENIG finished boards using both the most popular Sn-Ag-Cu alloy, 3% Ag – SAC 305, and the alloy with higher Ag content, SAC 405 solder. BGAs and CSPs had SAC 305 and SAC 405 balls; therefore pure SAC 305 and SAC 405 solder joints were formed. Thermal cycling using a −55°C to 125°C profile was conducted on assembled test boards for 3000 cycles. As-assembled and thermal cycled solder joints were examined using optical and scanning electron microscopy. This paper discusses fatigue life of Ball Grid Array and leaded components in comparison with 0°C to 100°C cycling, and similarities and differences in the performance of pure SAC 305 and SAC 405 solder joints in Harsh Environments. Special attention was focused on studying interfacial cracking on the ENIG finish in lead-free solder joints after −55°C to 125°C cycling.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 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