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Add Kemet Ex2 Series Mechanical Relays

Ed Peguillan III requested to merge github/fork/yankee14/kemet_Ex2_series_mechanical_relays into master

This PR adds a family of DPDT relays from Kemet. They differ by package type, size, functionality, and coil voltage.

Datasheet: https://content.kemet.com/datasheets/KEM_R7002_EC2_EE2.pdf

Symbol PR: https://github.com/KiCad/kicad-symbols/pull/2631 Footprint PR: https://github.com/KiCad/kicad-footprints/pull/2230 Packages3D-source PR: https://github.com/KiCad/kicad-packages3D-source/pull/280

  • 2 general package types
    • DIP --> PN beginning with EC2
    • SMD --> PN beginning with EE2
  • 3 or 5 different coil voltages, these make up the symbol aliases
    • 3V, available on all variants
    • 4.5V, available on all variants
      • I don't like decimal point in part name, should replace with underscore? Or maybe 4V5?
    • 5V, available on all variants except NKX
    • 12V, available on all variants
    • 24V, available on all variants except NKX
  • 3 different functional variants, these must make up separate symbols since the symbol artwork will differ
    • Non-latch type --> No letter after coil voltage
    • Single coil latch type --> S after coil voltage
    • Double coil latch type --> T after coil voltage
  • 4 different general footprints, length and width differ depending on relay lead type
    • THT for non-latch and single coil type
    • THT for double coil latch type
    • SMD for non-latch and single coil type
    • SMD for double coil latch type
  • 4 different lead types, each of these types have unique footprint
    • Standard --> NU after latching type
    • High density footprint --> NUH after latching type
    • High solder retention --> NUX after latching type
    • High solder retention and high breakdown voltage --> NKX after latching type

@evanshultz I saw that you recently broke some relays into separate units. Would you prefer this PR to have broken-up relays instead of, or in addition to, what is already here?

Screencap of general non-latch type: EC2-3NU

Screencap of general single coil latch type: EC2-3SNU

Screencap of general double coil latch type: EC2-3TNU

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 symbol(s) you are contributing
  • An example screenshot image is very helpful
  • Ensure that the associated footprints match the official footprint library
    • A new fitting footprint must be submitted if the library does not yet contain one.
  • If there are matching footprint PRs, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
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