ink marking
**Ink Marking** is a semiconductor packaging process that applies identification information to package surfaces using specialized inks and printing techniques.
## What Is Ink Marking?
- **Purpose**: Permanent part identification (logo, part number, lot code)
- **Methods**: Pad printing, inkjet printing, screen printing
- **Inks**: Epoxy-based inks cured by heat or UV
- **Location**: Package top surface, typically opposite leads
## Why Ink Marking Matters
Traceability throughout the supply chain depends on readable, durable markings. Poor marking causes rejected shipments and counterfeit vulnerability.
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**Quality Requirements**:
- Legible after 3× reflow soldering
- Resistant to cleaning solvents (IPA, flux removers)
- No bleeding or smearing
- Consistent contrast and positioning
- Compliant with customer specs (font, content, location)