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Design007-Oct2022

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20 DESIGN007 MAGAZINE I OCTOBER 2022 Feature Article by Cherie Litson LITSON1 CONSULTING HDI—high-density interconnect—designs require some different thinking on the part of the designer. One of the first things to consider is whether you need HDI, and how much. e HDI option comes into play as soon as you purchase any components with 0.5 mm pin pitch. e number of these components and other specifications of your design will deter- mine the amount of HDI you will need. Here's a quick list of HDI options: • Smaller vias • Smaller traces • inner dielectrics • Tighter solder mask clearances • Controlled paste mask construction Each option brings choices that will affect fabri- cation and assembly, so a little research is needed before making these choices. I'm only going to explore the first two, as these oen determine which fabrication process you want to use. A Designer's Point of View

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