Overview
IEC 60749-9:2017 specifies methods to assess the permanence of marking on solid-state semiconductor devices. The standard is intended to verify that device markings remain legible after exposure to common PCB assembly and cleaning operations, including the application and removal of labels and contact with solvents used to remove solder flux residue. The procedures are non-destructive and suitable for qualification and process monitoring of all package types (excluding laser-branded parts).
Why it matters: legible, permanent markings are essential for traceability, warranty handling, assembly verification, and regulatory compliance across electronics manufacturing and supply chains.
Key Topics
- Scope and applicability: Test applies to solid-state semiconductor packages and is usable for both qualification and ongoing process monitoring.
- Solvent resistance testing: Devices are immersed and brushed in defined solvent variants. The procedure specifies three immersion and brushing cycles, brush stroke count, and rinse/dry inspection. Solvent C is maintained at elevated temperature per the standard; solvent A is used at room temperature ranges noted in the normative text.
- Tape pull (adhesive) test: A tape pull variant evaluates marking adhesion when labels are applied and removed. The test calls for a continuous 90° tape pull at an approximate speed (documented speed), with the operation repeated three times.
- Equipment and safety: Non-reactive containers, specified brushes, and an explosive-proof hot plate (for heated solvents) are called out. Strict ventilation, PPE, and solvent handling precautions are required due to health and flammability risks.
- Failure criteria: A marking is considered failed if it is missing, faded, smeared, blurred, or dislodged to the point it cannot be readily identified from 15 cm in normal room lighting, or when inspected with magnification no greater than 3x.
Applications
- Process qualification for semiconductor assembly and PCB manufacturing lines to ensure markings survive cleaning and labeling steps.
- Incoming inspection and supplier qualification to validate marking durability on parts used in high-reliability electronics.
- Process monitoring to detect drift in ink, coating, or marking processes that could affect traceability and downstream identification.
- Non-destructive verification for rework, repair, and retrofit operations where parts must retain readable identifiers.
Practical benefits: implementing IEC 60749-9 testing reduces field returns caused by unreadable markings, supports compliance with traceability requirements, and helps maintain production yield by catching marking defects early.
Related Standards
- IEC 60749 series (Mechanical and climatic test methods for semiconductor devices)
- IEC 61340-2-3 (for electrostatic properties referenced in tape selection)
- Relevant industry and national guidance on solvent safety and handling
For procurement and test planning, the standard recommends specifying the number of parts to be tested, acceptance criteria, and any modifications to the standard procedure that apply to specific devices or processes.
Open preview (PDF)Semiconductor devices - Mechanical and climatic test methods - Part 9: Permanence of marking
