PTH Connector Temperature Mass Study: Plastic Housing Survival After Elevated Lead-Free Process Temperature Exposures
Bibliographic record
Abstract
ABSTRACT As the industry continues to gain experience building high complexity, Storage and Server class lead-free hardware systems, new reliability risks continue to be identified and studied. Questions related to the survival and integrity of certain pin through hole (PTH) connector plastic housing materials have arisen due to observations of connector housing melting, form, fit, and function changes after exposure to elevated temperature lead-free processing. Further investigation into these observations revealed that a gap in understanding of allowable maximum peak temperatures and time at temperature during actual lead-free PTH wave soldering and solder fountain rework operations was present within the industry. Building upon earlier work in 2002 to characterize time and temperature data for various lead-free BGA devices [1], a new temperature mass study was crafted to study processing effects on various pinthrough-hole connector systems. This paper discusses early connector melting observations, time/temperature characterization approach, test vehicles employed, and final results obtained during primary attach wave and solder fountain rework lead-free processing. Resulting data and discussion covers various plastic housing materials and multiple connector technlogies.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".