Overview
IEC 60749-3:2017 - "Semiconductor devices - Mechanical and climatic test methods - Part 3: External visual examination" defines a standardized non-destructive external visual inspection method for semiconductor devices. The standard verifies that materials, design, construction, markings and workmanship conform to the applicable procurement document. It is applicable to all package types and intended for qualification, process monitoring or lot acceptance.
Key Topics
- Scope and purpose: Confirms conformance with procurement documents through visual inspection; useful for incoming inspection, production control and qualification.
- Test apparatus: Typical optical magnification between 3× and 10× (up to 30× when required) and illumination in the range 1 000–10 000 lux with ambient overhead lighting >200 lux.
- Procedure: Inspection per relevant specification and Clause 6 failure criteria; use of clean filtered air to remove doubtful foreign material; strict ESD protection per IEC 61340-5-1 during handling.
- Failure criteria: Clear pass/fail rules including incorrect markings, corrosion, contamination (including tin whiskers, referenced to IEC 62483), bent/broken terminals, exposed base metal, cracks, excessive chip-out (>1.5 mm or >25% of thickness), and other features that interfere with normal application.
- Reporting: Annex A provides an optional report form/checklist covering leads, lead finish, moulding, sealant, attachments, marking, solder balls, substrate and exposed silicon - recommended for consistent record keeping.
- Significant updates (2017 edition): added emphasis on ESD protection, inclusion of tin whisker information, and an optional checklist/report form.
Applications
IEC 60749-3 is used by:
- Semiconductor manufacturers for lot acceptance, process control and final inspection.
- Quality engineers and incoming inspection teams to verify supplier conformity.
- Test and reliability laboratories performing device qualification and screening.
- Procurement and design teams to ensure marking, packaging and workmanship meet contractual requirements.
Practical tasks include visual acceptance sampling, documentation of defects using the checklist, and initial screening before electrical or environmental testing.
Related Standards
- IEC 61340-5-1 - Electrostatics: protection of electronic devices (ESD handling).
- IEC 62483 - Environmental acceptance requirements for tin whisker susceptibility.
- Other parts of the IEC 60749 series (mechanical and climatic test methods) for complementary tests and marking guidance (e.g., IEC 60749-9 referenced for marking).
Keywords: IEC 60749-3, external visual examination, semiconductor devices, visual inspection, ESD protection, tin whiskers, non-destructive test, inspection checklist, failure criteria, package inspection.
Open preview (PDF)Semiconductor devices - Mechanical and climatic test methods - Part 3: External visual examination
