Scatter One failing cloud, one moving review window
Wafer Sort Review
From failing lot to signed-off decision.
Stratum is wafer sort review software for mixed-signal and analog teams. Investigate the lot, stage PAT or DPAT screens, measure exact die-level impact, and save the signed-off result in one workflow instead of rebuilding it in Excel, JMP, slides, and email.
Move the limits. Watch the review change.
Many teams still do this part in Excel or JMP, then rebuild the results in slides and spreadsheets for review. Here the charts and the review stay linked, and the same scoped lot can continue into SQL and Python.
Drag the limit lines to see the review update in real time.
Example review
Lot 18A7 ยท SKEW_CLK
Histogram The distribution stays fixed while the review window moves
Baseline window Proposed LSL Proposed USL In window Outside window
Workflow
One wafer sort workflow from ingest to sign-off.
Stratum is built around one rule: the decision should stay tied to the same lot, the same screening logic, and the same evidence from ingest through approval.
- 01
Ingest
Upload STDF, review parsed metadata before ingest, and keep each lot as a clear snapshot instead of a pile of files.
- 02
Investigate
Use linked scatter, histogram, wafer, and spatial views to isolate the population that matters.
- 03
Screen
Generate PAT and DPAT screens or stage manual limit changes without leaving the same notebook context.
- 04
Decide
Resolve exact die-level impact, move the proposal through review, and keep the audit trail attached to the same evidence.
- 05
Export
Send operations a CSV die list and management a review artifact from the same proposal.
Core Capabilities
Built for wafer sort review, not just exploration.
The product is strongest when the analysis needs to survive handoff, review, and approval.
Screening in the review flow
Generate PAT or DPAT screens from the current lot or a reference lot and keep that screening logic attached to the review.
Exact die-level review
What-if proposals resolve to exact outcomes with rescued dies, new fails, top impacted tests, and top impacted wafers.
Audit trail and sign-off
The proposal, rationale, review status, and exported artifact stay in versioned notebook documents instead of screenshots and side-channel threads.
Controlled collaboration
Role-based spaces, notebook controls, ingest review, and approval boundaries keep the workflow usable for both the engineer building the proposal and the manager approving it.
Who It Is For
Built for the engineer making the proposal and the manager signing it.
Yield and test engineers
Build the proposal, inspect the exact impact, and stop rebuilding the review in Excel, JMP, and side-channel spreadsheets.
Engineering managers and quality leads
Review one artifact instead of reconciling a spreadsheet, a slide deck, and an email thread that all drift apart.
> Need quick local inspection instead of a shared review workflow? Start with stdf.io.
Ready to stop rebuilding reviews?
See how Stratum keeps the evidence, the screening logic, and the decision together from ingest through sign-off.