Lot number is the unique production identifier assigned to a group of units processed under common manufacturing conditions - it is the backbone of semiconductor traceability and containment workflows.

What Is Lot number?

• Definition: Structured ID linking units to shared material batches, tools, and process windows.
• Hierarchy Role: Often nested within wafer, strip, and unit-level identifiers.
• Data Integration: Referenced across MES, test, reliability, and logistics systems.
• Usage Scope: Appears on package marks, labels, and shipment documentation.

Why Lot number Matters

• Containment Precision: Enables targeted holds and recalls when defects are discovered.
• Root-Cause Analysis: Connects field failures to exact manufacturing history.
• Compliance: Traceability regulations often require lot-level record retention.
• Operational Visibility: Improves production tracking and excursion response speed.
• Customer Confidence: Reliable lot tracking supports transparent quality communication.

How It Is Used in Practice

• ID Governance: Define consistent lot-number format and uniqueness rules enterprise-wide.
• System Linking: Synchronize lot IDs across assembly, test, and distribution databases.
• Audit Controls: Run routine traceability drills to verify end-to-end lot lookup integrity.

Lot number is a fundamental control key in manufacturing quality systems - robust lot-number governance is required for rapid and accurate problem containment.