Design considerations

4 important questions on Design considerations

Why is moisture absorption a concern to the designer?

  1. It changes the electrical characteristics in the material
  2. it can alter dimension configuration
  3. It can cause potential difficulties in assembly

How is laminate material specified in a material code designation!

L21 1500 C1/C1 A1A
  • type of material
  • dielectric thickness: does not include metal cladding
  • copper foil designation
  • pit designation
  • thickness class tolerance
  • bow and twist designation

Sum up different types of assemblies what requirements do they carry with them?

  • through-hole
  • surface mount technology
  • ball grid array
  • chip scale packaging/HDI
  • mixed technologies
you want the best condition for each component attachment
surface issues become critical
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What's the difference between Burn-in and HAST?

  • Burn-in: to catch early failures
  • HAST: to test the product to failure

The question on the page originate from the summary of the following study material:

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