PCB Regulatory Frameworks & Compliance 4 — Questions and Answers
Question 1: Which IPC document defines the land pattern (footprint) geometry recommendations for SMT component packages?
- IPC-2221
- IPC-7351 (Correct answer)
- IPC-A-610
- IPC-6012
Correct answer: IPC-7351
IPC-7351 (Generic Requirements for Surface Mount Design and Land Pattern Standard) provides land pattern geometries for SMT component packages.
Question 2: A board must operate in a marine environment. Which standard's salt spray (fog) testing requirements would be most relevant for conformal coating validation?
- IPC-CC-830
- MIL-STD-810
- IPC-6012
- ASTM B117 (Correct answer)
Correct answer: ASTM B117
ASTM B117 is the standard practice for operating salt spray (fog) testing apparatus, commonly referenced for corrosion resistance validation of coatings.
Question 3: Under RoHS 3 (EU 2015/863), what are the maximum allowable concentration limits for restricted substances in homogeneous materials?
- 100 ppm for lead, 1000 ppm for cadmium
- 1000 ppm for lead, 100 ppm for cadmium (Correct answer)
- 500 ppm for all restricted substances
- No lead allowed; 1000 ppm for all others
Correct answer: 1000 ppm for lead, 100 ppm for cadmium
RoHS specifies a maximum of 1000 ppm (0.1%) for lead, mercury, hexavalent chromium, PBB, and PBDE, and 100 ppm (0.01%) for cadmium.
Question 4: For a PCB used in automotive electronics, which standard defines quality management and reliability requirements specific to the automotive supply chain?
- ISO 9001
- IATF 16949 (Correct answer)
- AS9100
- ISO 14001
Correct answer: IATF 16949
IATF 16949 is the automotive-sector-specific quality management standard that extends ISO 9001 requirements for the automotive supply chain.
Question 5: Which IPC standard specifically covers the qualification and performance requirements for high-density interconnect (HDI) PCBs?
- IPC-6012
- IPC-6016 (Correct answer)
- IPC-2226
- IPC-4101
Correct answer: IPC-6016
IPC-6016 provides qualification and performance specifications for high-density interconnect (HDI) layers or boards.
Question 6: During PCB design review for WEEE compliance, what is the designer's primary responsibility?
- Ensuring the board can withstand 250°C reflow temperatures
- Marking the product with the crossed-out wheeled bin symbol (Correct answer)
- Calculating thermal resistance of all components
- Verifying all traces meet 50-ohm impedance
Correct answer: Marking the product with the crossed-out wheeled bin symbol
WEEE (Waste Electrical and Electronic Equipment) requires products to be marked with the crossed-out wheeled bin symbol to indicate separate collection.
Question 7: What does the IPC-9252 standard cover in the context of PCB testing?
- Electrical testing of unpopulated printed boards (Correct answer)
- Cleanliness and ionic contamination testing
- Thermal cycling test procedures
- Solder joint reliability assessment
Correct answer: Electrical testing of unpopulated printed boards
IPC-9252 defines requirements and guidelines for electrical testing of unpopulated (bare) printed boards including continuity and isolation testing.
PCB Regulatory Frameworks & Compliance 4
Which IPC document defines the land pattern (footprint) geometry recommendations for SMT component packages?