CV-7 first-pass yield decline
Bin 7 continuity failures · opened by Macro on Oct 6 at 18:40 · owner Priya Raman
What Macro found
From Corvane data onlyFirst-pass yield fell 3.9 points this week. Bin 7 continuity failures explain 90% of the loss, and every affected lot used mold compound lot MC-5107.
But 5 of 14 MC-5107 lots tested normally, and a cure-profile change at Talus (PCN-2291) took effect the day the first affected lot was assembled. Separating the two needs lot-level line and cure data that Talus holds.
- FPY this week
- 93.9%
- Affected lots
- 9
- Units in affected lots
- 31,201
- Excess Bin 7 fails
- ≈ 1,681
Evidence gap
Which lots ran under the new cure profile? Talus holds the answer.
Macro drafted a narrow request: line and cure version for 20 lots, plus an aggregate trend. No recipes, no other customers.
Failure mode
Fail rate by bin · this week- Bin 7 · Continuity3.81%Baseline 0.36%
- Bin 9 · Leakage0.79%Baseline 0.43%
- Bin 5 · Parametric0.61%Baseline 0.61%
- Bin 3 · Functional0.57%Baseline 0.55%
- Bin 11 · Handler0.31%Baseline 0.30%
Mold compound lot
Bin 7 rate · 8 weeks- MC-45230.34%42 lots · 145,676 units
- MC-48210.37%56 lots · 193,930 units
- MC-51073.78%14 lots · 48,490 units
Assembly line and cure profile per lot
Needed to tell a material effect from the PCN-2291 process change. Talus holds this record; Corvane can request a scoped share.
Ruled out
This weekTestersRuled out
Affected lots on all four testers
- T-014.5%
- T-023.1%
- T-033.8%
- T-043.8%
Test programRuled out
Decline began on TP 4.2
- TP 4.23.0%
- TP 4.33.9%
Wafer lotsRuled out
Each also produced normal lots
- W-88793.0%
- W-88863.9%
- W-88934.0%
Explanations
Ranked by evidence, not by a scoreMaterial: compound lot MC-5107
ForAll 9 affected lots used it.
Against5 MC-5107 lots tested normally.
OpenProcess: cure profile change (PCN-2291)
ForFirst affected lot assembled the day it took effect.
AgainstCorvane can't see which lots ran the new profile.
Needs Talus data
Timeline
- Oct 3Compound lot MC-5107 enters assemblyTalus traveler
- Oct 4PCN-2291: cure profile v2.1 on Line 3Talus change notice
- Oct 5First-pass yield drops below control limitFinal test
- Oct 6Test program TP 4.3 releasedCorvane
- Oct 6 · 18:40Macro opens INV-0142Macro
Affected lots
9 lots with Bin 7 above 2%| Lot | Tested | Compound | Tester | Wafer lot | Line | Cure | Bin 7 |
|---|---|---|---|---|---|---|---|
| AL-24138 | Oct 5 | MC-5107 | T-01 | W-8879 | 5.47% | ||
| AL-24140 | Oct 6 | MC-5107 | T-03 | W-8886 | 5.71% | ||
| AL-24142 | Oct 7 | MC-5107 | T-02 | W-8886 | 6.12% | ||
| AL-24144 | Oct 8 | MC-5107 | T-03 | W-8886 | 5.23% | ||
| AL-24145 | Oct 8 | MC-5107 | T-04 | W-8886 | 5.27% | ||
| AL-24146 | Oct 9 | MC-5107 | T-01 | W-8893 | 5.89% | ||
| AL-24148 | Oct 10 | MC-5107 | T-04 | W-8893 | 5.91% | ||
| AL-24149 | Oct 10 | MC-5107 | T-02 | W-8893 | 5.79% | ||
| AL-24150 | Oct 11 | MC-5107 | T-01 | W-8893 | 5.70% |
Next steps
Suggested by Macro- 1Request line and cure-profile version for 20 lots from TalusCorvane quality
- 2Hold unbuilt MC-5107 material pending reviewTalus (proposed)
- 3Acoustic microscopy (C-SAM) on retained Bin 7 unitsTalus failure analysis
- 4Assess shipped units from affected lotsCorvane quality