PCB Regulatory Frameworks & Compliance 2 — Questions and Answers
Question 1: Under IPC-2221, what is the minimum electrical clearance required between uncoated conductors at 101–300V DC on the external layer of a Class 3 board?
- 0.1 mm
- 0.5 mm
- 1.25 mm (Correct answer)
- 2.5 mm
Correct answer: 1.25 mm
IPC-2221 Table 6-1 specifies 1.25 mm minimum clearance for external conductors at 101–300V in non-coated Class 3 applications.
Question 2: Which EU directive specifically governs the restriction of hazardous substances like lead and cadmium in electronic equipment?
- REACH
- WEEE
- RoHS (Correct answer)
- EuP
Correct answer: RoHS
The RoHS Directive (2011/65/EU) restricts the use of lead, cadmium, mercury, and other hazardous substances in electrical and electronic equipment.
Question 3: A PCB intended for aerospace avionics must comply with which IPC standard for high-reliability rigid boards?
- IPC-A-600
- IPC-6012 (Correct answer)
- IPC-7711
- IPC-2581
Correct answer: IPC-6012
IPC-6012 is the qualification and performance specification for rigid printed boards, with Class 3A addendum covering aerospace/military requirements.
Question 4: What does the FCC Part 15 regulation primarily address for PCB designers?
- Flammability ratings of PCB substrates
- Unintentional electromagnetic emissions from digital devices (Correct answer)
- Maximum operating temperatures for components
- Lead-free soldering process requirements
Correct answer: Unintentional electromagnetic emissions from digital devices
FCC Part 15 sets limits on unintentional radio frequency emissions from digital devices to prevent interference with licensed radio services.
Question 5: Which IPC standard defines the acceptability criteria for solder joints on surface mount components?
- IPC-A-610 (Correct answer)
- IPC-2221
- IPC-7351
- IPC-6012
Correct answer: IPC-A-610
IPC-A-610 (Acceptability of Electronic Assemblies) defines visual and workmanship criteria for solder joints including SMT components.
Question 6: For UL 94 flammability ratings, which rating indicates the material self-extinguishes and does not drip flaming particles?
- V-0 (Correct answer)
- V-1
- V-2
- HB
Correct answer: V-0
UL 94 V-0 is the most stringent vertical burn rating, requiring self-extinction within 10 seconds with no flaming drips.
Question 7: Which standard governs the qualification of printed circuit board fabricators and sets requirements for their quality management processes?
- IPC-6012
- IPC-9252
- AS9100 (Correct answer)
- IPC-A-600
Correct answer: AS9100
AS9100 is the aerospace quality management system standard that PCB fabricators serving aerospace customers must be certified to.
PCB Regulatory Frameworks & Compliance 2
Under IPC-2221, what is the minimum electrical clearance required between uncoated conductors at 101–300V DC on the external layer of a Class 3 board?