Customer Returns in semiconductor manufacturing are devices sent back by customers due to quality, reliability, or performance issues — encompassing both warranty returns (covered by guarantee) and non-warranty returns (customer complaints, misuse, or field application issues).

Return Categories

• DOA (Dead on Arrival): Device fails upon customer receipt — test escape from manufacturing.
• Early Life Failure: Fails during initial customer testing or burn-in — latent manufacturing defect.
• Field Return: Fails during actual end-use operation — reliability or application-induced failure.
• NTF (No Trouble Found): Device passes all re-tests — customer application issue, ESD damage, or intermittent failure.

Why It Matters

• NTF Rate: 30-50% of returns are often NTF — understanding NTF is important (application support, test coverage, intermittent issues).
• Tracking: Returns are tracked as PPM (parts per million) per customer — key quality KPI.
• Relationship: How returns are handled directly impacts customer relationships — rapid, transparent response builds trust.

Customer Returns are the voice of quality — returned devices that reveal manufacturing, testing, or reliability gaps requiring corrective action.