Overview
IEC TR 63571:2025 - Semiconductor devices: Estimation method for lifetime conversion from “PART” to “SYSTEM” is an IEC Technical Report (Edition 1.0, 2025‑05) that defines a mathematical method to convert component‑level (“PART”) lifetime data into device‑ or product‑level (“SYSTEM”) lifetime estimates. The report targets semiconductor reliability assessment during wafer/TEG (test element group) development and LSI design, presenting a general theory plus simple calculation examples for educational use. Note: software‑related elements (for example diagnostics) are explicitly outside the scope.
Key topics and technical content
- Definitions and scope: Clear definitions for SYSTEM, UNIT, and PART, and the lifetimes derived from time‑to‑failure cumulative distribution functions.
- Mathematical framework: General formulas for converting PART‑level time‑to‑failure distributions into UNIT‑level and SYSTEM‑level cumulative distribution functions using series and parallel failure models (series chain for UNIT→SYSTEM; series/parallel combinations for PART→UNIT).
- Failure mechanisms covered: Examples and applied cases focus on physical failure modes that can be identified at PART level, including TDDB (time‑dependent dielectric breakdown), stress migration (SM), and electromigration (EM). Degradation modes such as BTI and HCI are discussed only where they clearly cause UNIT or SYSTEM failure.
- Practical calculation examples: Annexes provide worked examples (e.g., MOS‑TDDB, Cu‑VIA SM, VIA EM), conversion of time‑varying stresses to equivalent constant conditions, and redundancy effects (parallel circuits, ECC examples).
- Educational emphasis: The TR is intended to teach the general approach rather than mandate specific test protocols. There are no normative references in the document.
Practical applications and who should use it
- Reliability engineers and failure analysts: Convert TEG/part‑level test results into realistic system lifetime predictions for chips and products.
- LSI and semiconductor design teams: Size margins and redundancy to achieve required system level reliability when scaling from wafer tests to large‑scale integrated circuits.
- Qualification and product managers: Support product lifetime claims, risk assessment, and decision making for manufacturing/process changes.
- Academic and training programs: Use the report’s examples and theory for teaching lifetime conversion concepts.
Related standards and references
- IEC TR 63571:2025 contains no normative references. It was developed by IEC TC 47 (Semiconductor devices) and drafted in accordance with ISO/IEC Directives. For implementation, users should consult applicable IEC/industry reliability and test standards relevant to specific failure mechanisms and device families.
Keywords: IEC TR 63571:2025, SYSTEM‑level lifetime, PART‑level lifetime, UNIT‑level lifetime, semiconductor reliability, lifetime conversion, TDDB, EM, SM, LSI, TEG.