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.