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.

Typical Package Marking:┌─────────────────────┐│ COMPANY LOGO ││ ││ PART NUMBER ││ XYZ12345-001 ││ ││ DATE CODE LOT ││ 2526 AB123 │└─────────────────────┘

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)

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