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Add SOP-10 and NSOP-16 footprints for HT42B534

Alex Studer requested to merge github/fork/thatoddmailbox/ht42b534 into master

Add SOP-10 and NSOP-16 footprints for HT42B534

This pull request goes along with KiCad/kicad-symbols#2695, which adds symbols for the HT42B534 USB-UART IC. (datasheet: https://www.holtek.com/documents/10179/11842/HT42B534-xv110.pdf)

Holtek uses slightly different names for some packages, so it was suggested in that PR to add footprints for those packages. Since I couldn't find a way to make an alias for packages, I copied and renamed the existing footprints. You can match the Holtek package drawings to the drawings referenced in the original footprints, and see that the dimensions are all the same.

Package_SO:SSOP-10_3.9x4.9mm_P1.00mm -> Package_SO:SOP-10_3.9x4.9mm_P1.00mm Package_SO:SOIC-16_3.9x9.9mm_P1.27mm -> Package_SO:NSOP-16_3.9x9.9mm_P1.27mm

Screenshots: image image

All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

  • Provide a URL to a datasheet for the footprint(s) you are contributing
  • An example screenshot image is very helpful
  • If there are matching symbol or 3D model pull requests, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
  • Give a reason behind any intentional library convention rule violation.

Be patient, we maintainers are volunteers with limited time and need to check your contribution against the datasheet. You can speed up the process by providing all the necessary information (see above). And you can speed up the process even more by providing a dimensioned drawing of your contribution. A tutorial on how to do that is found here: https://forum.kicad.info/t/how-to-check-footprint-correctness/9279 (This is optional!)

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