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Scripted version of qfn 24 4x5 (2.65x3.65 ep)

Rene Poeschl requested to merge github/fork/poeschlr/scripted_qfn244x5 into master

Script PR: https://github.com/pointhi/kicad-footprint-generator/pull/250

https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_24_05-08-1696.pdf

screenshot from 2018-12-28 12-02-04

QFN-24-1EP_4x5mm_P0.5mm_EP2.65x3.65mm:
  device_type: 'QFN'
  size_source: 'https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_24_05-08-1696.pdf'
  ipc_class: qfn #'qfn_pull_back'
  body_size_x:
    nominal: 4.0
    tolerance: 0.1
  body_size_y:
    nominal: 5.0
    tolerance: 0.1
  body_height:
    nominal: 0.75
    tolerance: 0.05

  lead_width:
    nominal: 0.25
    tolerance: 0.05
  lead_len:
    nominal: 0.4
    tolerance: 0.1

  EP_size_x:
    nominal: 2.65
    tolerance: 0.1
  EP_size_y:
    nominal: 3.65
    tolerance: 0.1
  EP_num_paste_pads: [2, 3]


  thermal_vias:
    count: [3, 4]
    drill: 0.2
    paste_via_clearance: 0.1
    EP_paste_coverage: 0.75
    paste_avoid_via: False

  pitch: 0.5
  num_pins_x: 5
  num_pins_y: 7

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