PCB Communication & Stakeholder Relations 3 — Questions and Answers
Question 1: What does the term 'design freeze' communicate to stakeholders in a PCB project?
- The PCB is ready for mass production
- No further schematic or layout changes will be accepted without formal ECO approval (Correct answer)
- The thermal simulation is complete
- The BOM has been finalized for procurement
Correct answer: No further schematic or layout changes will be accepted without formal ECO approval
A design freeze signals that the design is stable and any subsequent changes require formal change control to protect schedule and cost.
Question 2: Which stakeholder group is most impacted if a PCB designer changes a connector from through-hole to SMT without notification?
- The schematic review team
- The PCB fabrication house
- The assembly team and test fixture team (Correct answer)
- The compliance certification body
Correct answer: The assembly team and test fixture team
Assembly processes, soldering profiles, and test fixtures are all connector-type dependent and must be updated when the package style changes.
Question 3: A project manager asks for the current completion percentage of the PCB layout. Which metric is most meaningful to report?
- Number of Gerber layers generated
- Percentage of connections routed vs. total connections (routing completion ratio) (Correct answer)
- Number of hours worked
- Total file size of the design database
Correct answer: Percentage of connections routed vs. total connections (routing completion ratio)
Routing completion ratio directly reflects how much of the electrical connectivity has been implemented and is the standard progress metric.
Question 4: A safety engineer requests compliance with IPC-2221 creepage and clearance rules. What should the PCB designer do first?
- Route all traces and check afterward
- Identify the working voltage and pollution degree to determine required spacings before layout (Correct answer)
- Use the minimum DRC spacing rules from the fab
- Request a waiver from the safety engineer
Correct answer: Identify the working voltage and pollution degree to determine required spacings before layout
Creepage and clearance requirements are voltage- and environment-dependent and must be determined before placing high-voltage components.
Question 5: When communicating a design delay to stakeholders, which approach is most professional?
- Wait until the original deadline passes before informing anyone
- Proactively notify stakeholders with the root cause, revised timeline, and mitigation plan (Correct answer)
- Blame component availability without offering solutions
- Minimize the delay without disclosing the actual cause
Correct answer: Proactively notify stakeholders with the root cause, revised timeline, and mitigation plan
Proactive communication with a root cause and recovery plan maintains trust and gives stakeholders time to adjust dependent activities.
Question 6: What is the purpose of including a revision history block on a PCB fabrication drawing?
- To list all component part numbers
- To provide a chronological record of drawing changes for traceability and communication (Correct answer)
- To specify the PCB material
- To indicate the layer stackup
Correct answer: To provide a chronological record of drawing changes for traceability and communication
Revision history blocks enable any stakeholder to quickly understand what changed, when, and why, supporting configuration management.
Question 7: A customer requests that a third-party EMS provider receive the full design database including CAD source files. What should the PCB designer consider first?
- Send the files immediately to meet the customer deadline
- Review IP ownership agreements and NDA requirements before releasing proprietary source files (Correct answer)
- Convert all files to Gerber format only
- Provide only the BOM to protect the design
Correct answer: Review IP ownership agreements and NDA requirements before releasing proprietary source files
Source CAD files are proprietary IP, and their release must be governed by contractual agreements to protect the design owner's intellectual property.
PCB Communication & Stakeholder Relations 3
What does the term 'design freeze' communicate to stakeholders in a PCB project?