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.

<svg viewBox="0 0 242 226" xmlns="http://www.w3.org/2000/svg" style="max-width:100%;height:auto" role="img"><rect x="0" y="0" width="242" height="226" rx="12" fill="#0d1117"/><g font-family="ui-monospace,SFMono-Regular,Menlo,Consolas,&quot;Liberation Mono&quot;,monospace" font-size="14"><text xml:space="preserve" x="20" y="31.7"><tspan fill="#c9d1d9">Typical Package Marking:</tspan></text><text xml:space="preserve" x="20" y="50.7"><tspan fill="#6e7681">┌─────────────────────┐</tspan></text><text xml:space="preserve" x="20" y="69.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">     COMPANY LOGO    </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="88.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">                     </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="107.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">    PART NUMBER      </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="126.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">    XYZ12345-001     </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="145.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">                     </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="164.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">  DATE CODE  LOT     </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="183.7"><tspan fill="#6e7681">│</tspan><tspan fill="#c9d1d9">   2526     AB123    </tspan><tspan fill="#6e7681">│</tspan></text><text xml:space="preserve" x="20" y="202.7"><tspan fill="#6e7681">└─────────────────────┘</tspan></text></g></svg>

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)