SURFACE MOUNT PROCESS
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Frequently Asked Questions


 Solder Paste Printing Process
  • What's the best practice for handling solder paste
  • What's the best solder paste quality control?
  • Type 3 or Type 4 Solder Paste
  • What's the best way to clean a misprinted PCB?
  • What factors affect solder paste transfer efficiency?
  • What is the difference between aspect ratio and area ratio of stencil apertures?
  • What stencil thickness should be used?
  • What squeegee speed should be used?
  • What squeegee pressure should be used?

Pick and Place Process
  • What's the best way to support a PCB during assembly?
  • How are components transferred from tray to tape and reel?
  • What is 'Package on Package' (POP)?

Reflow Soldering Process
  • PCB delamination during reflow soldering
  • Component weight limit on PCB underside during reflow soldering
  • What are the different types of reflow profile?

Cleaning
  • What are the differences between 'Water-soluble' and 'No-clean' flux?
  • What causes electrochemical migration (ECM)?
  • What is the difference between ionic and non-ionic contamination?
  • Why clean a PCBA that has been soldered using no-clean flux?
  • How do engineered cleaning fluids such as Zestron and Kyzen work?
  • How does the pH level affect engineered cleaning fluids?
  • How do mixed-bed and carbon filters work in PCB cleaning systems?
  • What are the risks of using ultrasonics to clean PCBA's?
  • What is ROSE (Resistivity of Solvent Extract) testing?
  • How do you validate a PCBA cleaning process?

General
  • What's the preferred PCB finish within the industry?
  • What is the 'floor life' for the different moisture sensitivity levels?
  • Is there a quick way of comparing bills of material to find differences when up issuing an assembly?
  • What does 'SMT' stand for?
  • What does the term voiding mean?
  • How is void percentage calculated?
  • What do you think of low temperature lead free solder paste?
  • What software is available to view Gerber data?
  • What software is available for PCB design?
  • How do you extract CAD data from PCB design software?
  • How are PCB's manufactured?

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