inking

**Inking** is **the historical wafer-marking process used to identify failing die locations before assembly** - Failing die are physically marked or logically mapped so downstream assembly avoids known bad units. **What Is Inking?** - **Definition**: The historical wafer-marking process used to identify failing die locations before assembly. - **Core Mechanism**: Failing die are physically marked or logically mapped so downstream assembly avoids known bad units. - **Operational Scope**: It is applied in yield enhancement and process integration engineering to improve manufacturability, reliability, and product-quality outcomes. - **Failure Modes**: Marking or map-transfer errors can cause good die loss or bad die escape. **Why Inking Matters** - **Yield Performance**: Strong control reduces defectivity and improves pass rates across process flow stages. - **Parametric Stability**: Better integration lowers variation and improves electrical consistency. - **Risk Reduction**: Early diagnostics reduce field escapes and rework burden. - **Operational Efficiency**: Calibrated modules shorten debug cycles and stabilize ramp learning. - **Scalable Manufacturing**: Robust methods support repeatable outcomes across lots, tools, and product families. **How It Is Used in Practice** - **Method Selection**: Choose techniques by defect signature, integration maturity, and throughput requirements. - **Calibration**: Cross-check mark maps with digital bin maps before singulation and packaging. - **Validation**: Track yield, resistance, defect, and reliability indicators with cross-module correlation analysis. Inking is **a high-impact control point in semiconductor yield and process-integration execution** - It supports yield management and binning control in legacy and mixed workflows.