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Scripted SOIC-8-1EP footprint for A4950E

Rene Poeschl requested to merge github/fork/poeschlr/soic-8_ep_motor_driver into master

http://www.allegromicro.com/~/media/Files/Datasheets/A4950-Datasheet.ashx#page=8

Script PR: https://github.com/pointhi/kicad-footprint-generator/pull/287 Symbol PR: https://github.com/KiCad/kicad-symbols/pull/1482

screenshot from 2019-02-03 15-55-34

SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm:
  size_source: 'http://www.allegromicro.com/~/media/Files/Datasheets/A4950-Datasheet.ashx#page=8'
  body_size_x:
    nominal: 3.9
    tolerance: 0.1
  body_size_y:
    nominal: 4.9
    tolerance: 0.1
  body_height:
    maximum: 1.7

  overall_size_x:
    nominal: 6.0
    tolerance: 0.2
  lead_len:
    minimum: 0.4
    maximum: 1.27
  lead_width:
    minimum: 0.31
    maximum: 0.51

  pitch: 1.27
  num_pins_x: 0
  num_pins_y: 4

  EP_size_x:
    nominal: 2.41
    tolerance: 0 # no tolerance given

  EP_size_y:
    nominal: 3.3
    tolerance: 0 # no tolerance given

  EP_num_paste_pads: [2, 2]

  thermal_vias:
    count: [2, 3]
    drill: 0.2
    paste_via_clearance: 0.1
    EP_num_paste_pads: [2, 2]
    EP_paste_coverage: 0.7
    grid: [1.4, 1.2]
    paste_avoid_via: False

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