success testing

**Success testing** is **reliability demonstration testing where passing is based on observing zero or very few failures in a defined test** - Given sample size and test duration, success criteria map directly to confidence in required reliability targets. **What Is Success testing?** - **Definition**: Reliability demonstration testing where passing is based on observing zero or very few failures in a defined test. - **Core Mechanism**: Given sample size and test duration, success criteria map directly to confidence in required reliability targets. - **Operational Scope**: It is applied in semiconductor reliability engineering to improve lifetime prediction, screen design, and release confidence. - **Failure Modes**: Underpowered plans can pass weak designs due to insufficient exposure. **Why Success testing Matters** - **Reliability Assurance**: Better methods improve confidence that shipped units meet lifecycle expectations. - **Decision Quality**: Statistical clarity supports defensible release, redesign, and warranty decisions. - **Cost Efficiency**: Optimized tests and screens reduce unnecessary stress time and avoidable scrap. - **Risk Reduction**: Early detection of weak units lowers field-return and service-impact risk. - **Operational Scalability**: Standardized methods support repeatable execution across products and fabs. **How It Is Used in Practice** - **Method Selection**: Choose approach based on failure mechanism maturity, confidence targets, and production constraints. - **Calibration**: Calculate required sample-time product from target reliability and confidence before test start. - **Validation**: Monitor screen-capture rates, confidence-bound stability, and correlation with field outcomes. Success testing is **a core reliability engineering control for lifecycle and screening performance** - It provides clear pass-fail evidence for qualification gates.