SURFACE MOUNT PROCESS
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  • Articles
    • A GUIDE TO EFFECTIVE STENCIL DESIGN
    • SOLDER PASTE PRINTING PROCESS
    • SOLDER PASTE INSPECTION PROCESS
    • COMPONENT PLACEMENT PROCESS
    • REFLOW SOLDERING PROCESS
    • POST-REFLOW AOI PROCESS
    • THROUGH-HOLE ASSEMBLY - SELECTIVE SOLDERING
    • Cleaning 'No-Clean' flux residues and other contaminants
    • Environmental Protection - Conformal Coating
    • Hand soldering and rework of surface mount components to IPC class 3
  • FAQ
    • Solder paste handling
    • Type 3 or Type 4 Solder Paste
    • Cleaning a misprinted PCB
    • Solder Paste Quality Control
    • What factors affect solder paste transfer efficiency
    • What stencil thickness should be used?
    • What is the difference between aspect ratio and area ratio of stencil apertures?
    • What squeegee speed should be used?
    • What squeegee pressure should be used?
    • What the differences between 'on-contact' printing and 'gap' printing?
    • What separation speed to use in solder paste printing?
    • What are the benefits / challenges of using halogen-free solder paste?
    • What is the best stencil aperture shape for solder paste transfer efficiency?
    • PCB delamination during reflow
    • What are the different types of reflow profile?
    • ROSE (Resistivity of Solvent Extract) testing
    • How do you validate a PCBA cleaning process?
    • Why clean a pcba that has been soldered using no-clean flux
    • How do engineered cleaning fluids such as Zestron and Kyzen work
    • How do engineered cleaning fluids affect surface tension and wetting angle?
    • 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 are the differences between 'Water-soluble' and 'No-clean' flux?
    • What is the difference between ionic and non-ionic contamination?
    • What causes electrochemical migration (ECM)?
    • What are methods of masking before conformal coating?
    • How to apply conformal coating by brushing?
    • How to apply conformal coating using dipping?
    • How to apply conformal coating using spray/aerosol?
    • How do selective robots apply conformal coating?
    • What is the best method to dry/cure conformal coating?
    • What concerns are there when demasking?
    • What should be checked when inspecting after conformal coating?
    • How to check the adhesion of conformal coating?
    • Tape and Reel Packaging Standards
    • What is 'Package on Package' (POP)?
    • Stock control and component attrition
    • BOM Comparison Software
    • Comparison of SAC305 and SAC387 Lead-Free Solder Alloys
    • What is a 'Eutectic' solder alloy?
    • What does 'SMT' stand for?
    • What does the term voiding mean?
    • How is void percentage calculated?
    • How to reduce voids in QFN device ground connection?
    • Low temperature lead free solder paste
    • CAD EXTRACTION
    • How are PCB's manufactured?
    • What are the IPC standards that govern electronics manufacturing processes?
    • What are the differences between SMEMA and HERMES?
  • Contact
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Design for Manufacture and Assembly

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Many electronic assemblies are primarily designed based upon the function of the circuit, which of course is very important, but it is also important to consider the way in which the assembly is to be manufactured.

Manufacturing cost is a key factor to any electronic assembly and two of the main elements of the manufacturing cost are the labour cost (time to manufacture) and tooling cost such as solder paste stencils.
 
These costs can be a significant percentage of the overall cost and so anything that can be done to reduce them should be considered.  If the assembly has components on both sides of the PCB one of the main questions to ask is ‘Can the assembly be designed having components on one side of the PCB only?’  If the answer is yes then this can be a significant cost saving as both labour and tooling cost will be reduced.
  • Design for Manufacture and Assembly recommendations
  • Surface Mount Troubleshooting Guide
  • Through-hole Troubleshooting Guide

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