How Many Dies Do You Get from an MPW Shuttle?
Why MPW sample count depends on die size, wafer share, yield, dicing, packaging and test choices.
- →What engineers should clarify first
- →Ask for sample class, not only sample number
- →Package/test decisions affect the answer
- →Use ranges responsibly
- →How this connects to MST
Answer-first summary: There is no one-size-fits-all die count for an MPW shuttle. The practical answer depends on die area, reticle sharing, wafer allocation, expected yield, dicing, package/test plan and whether the buyer needs bare dies, packaged samples or characterized parts.
One of the most common MPW questions is also one of the easiest to oversimplify: how many chips will we get? A serious RFQ should separate gross die estimate, expected good die, packaged sample count and characterized parts.
What engineers should clarify first
| Count type | Meaning | Why it changes |
|---|---|---|
| Gross dies | Theoretical layout count before yield | Die size, scribe lanes, reticle sharing and wafer allocation |
| Good dies | Dies expected to pass initial screen | Process yield, design sensitivity, probe coverage |
| Packaged samples | Dies assembled into package | Package choice, assembly yield, budget and sample plan |
| Characterized parts | Parts with useful measured data | Test plan, socket/board readiness and engineering time |
Ask for sample class, not only sample number
A bare die count does not answer the same business question as packaged, tested samples. The RFQ should state what the team needs to learn and which sample class supports that learning.
Package/test decisions affect the answer
A team that ignores packaging may receive silicon but still be blocked from bring-up. Package type, probe strategy and bench setup should be scoped before tapeout.
Use ranges responsibly
Early estimates should be ranges, not promises. Final sample counts depend on partner terms, die area, wafer allocation, process yield and assembly/test outcomes.
How this connects to MST
Include die area, sample target, package and test expectations in the MPW RFQ. MST uses this article as an intake guide, not as a promise of partner access, compliance certification, fixed sample count, fixed pricing, or automatic production approval.
FAQ
Can I calculate die count from die area only?
Only roughly. Die area is important, but wafer sharing, yield, scribe, exclusion zones and program rules also matter.
Should I request bare die or packaged parts?
Request the form that supports your validation plan. Many teams need packaged parts for board-level bring-up.
Can MST promise a sample count?
No. MST can help scope the request, but partner rules and manufacturing results control the final answer.
Public references for engineering context
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