PCB Regulatory Frameworks & Compliance 5 — Questions and Answers
Question 1: A PCB designed for a Class III medical device in the US must be manufactured under which regulatory framework?
- FDA 21 CFR Part 820 (Quality System Regulation) (Correct answer)
- FCC Part 15
- IEC 60601-1 only
- UL 94 V-0 requirement
Correct answer: FDA 21 CFR Part 820 (Quality System Regulation)
FDA 21 CFR Part 820 (Quality System Regulation, now harmonized with ISO 13485) governs the manufacture of medical devices including their PCBs.
Question 2: Which IPC specification document (slash sheet) would a designer reference when specifying FR-4 laminate material properties?
- IPC-4101/21 (Correct answer)
- IPC-2221
- IPC-6012
- IPC-A-600
Correct answer: IPC-4101/21
IPC-4101 with slash sheet /21 specifies the requirements for FR-4 (woven E-glass, epoxy) base laminate materials.
Question 3: What is the maximum concentration of hexavalent chromium (Cr VI) permitted under RoHS in homogeneous materials?
- 100 ppm
- 500 ppm
- 1000 ppm (Correct answer)
- 2500 ppm
Correct answer: 1000 ppm
RoHS limits hexavalent chromium to 1000 ppm (0.1%) by weight in homogeneous materials, the same threshold as lead and mercury.
Question 4: In IPC-A-600 acceptability criteria, what does a 'target condition' represent?
- The minimum acceptable quality level for shipment
- The preferred, near-perfect condition exceeding minimum requirements (Correct answer)
- A condition that requires engineering disposition
- The condition allowed only for Class 1 products
Correct answer: The preferred, near-perfect condition exceeding minimum requirements
IPC-A-600 defines target condition as the preferred, near-perfect state that enhances reliability but is not always achievable in production.
Question 5: Which agency administers the ITAR (International Traffic in Arms Regulations) that affects PCB designs for defense applications?
- Department of Commerce (BIS)
- Department of State (DDTC) (Correct answer)
- Department of Defense (DOD)
- Federal Communications Commission (FCC)
Correct answer: Department of State (DDTC)
ITAR is administered by the Directorate of Defense Trade Controls (DDTC) within the US Department of State, controlling defense-related exports.
Question 6: A flex PCB designer must meet IPC-6013 requirements. What is the primary difference between Type 1 and Type 3 flexible circuits?
- Type 1 is single-sided; Type 3 is multilayer flex with three or more layers (Correct answer)
- Type 1 uses polyimide; Type 3 uses PTFE
- Type 1 is for Class 1 only; Type 3 is for Class 3 only
- Type 1 has no coverlay; Type 3 requires conformal coating
Correct answer: Type 1 is single-sided; Type 3 is multilayer flex with three or more layers
IPC-6013 defines Type 1 as single-sided flexible circuits and Type 3 as multilayer flexible circuits containing three or more conductive layers.
Question 7: Under MIL-PRF-31032, what is the primary basis for qualifying a PCB manufacturer for defense programs?
- Passing a one-time sample lot inspection
- Maintaining certified QPL (Qualified Products List) status through ongoing testing and audits (Correct answer)
- Achieving UL 94 V-0 rating on all materials
- Compliance with RoHS and REACH only
Correct answer: Maintaining certified QPL (Qualified Products List) status through ongoing testing and audits
MIL-PRF-31032 requires manufacturers to be listed on the Qualified Products List (QPL) maintained through periodic audits and testing by the Defense Logistics Agency.
PCB Regulatory Frameworks & Compliance 5
A PCB designed for a Class III medical device in the US must be manufactured under which regulatory framework?