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understanding/interpreting the mechanical drawings of parts

Discussion in 'Circuit Simulation & PCB Design' started by arunkumar413, Jun 25, 2017.

  1. arunkumar413

    arunkumar413 New Member

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    Hi Team,

    I know schematic design but the only problem is understanding and interpreting the mechanical drawings of the electronic components. I couldn't find much documentation on the internet to convert the component's drawings into a PCB footprint. There are simple tutorials like land pattern but there aren't any tutorials for complex package types. Could you please guide me on how to learn, understand and interpret the drawings and convert them to a footprint.

    Thanks
    Arun
     
  2. Pommie

    Pommie Well-Known Member Most Helpful Member

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    It would help if we knew what software package you are using.

    Mike.
     
  3. dougy83

    dougy83 Well-Known Member

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    Can you give an example of the component you're having trouble with?
     
  4. dave

    Dave New Member

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  5. arunkumar413

    arunkumar413 New Member

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    I'm using KiCad because it's free. Also I'm trying to build a web based schematic editor and PCB (https://github.com/arunkumar413/Online-EDA/wiki)
     
  6. alec_t

    alec_t Well-Known Member Most Helpful Member

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    The datasheets of most components show land patterns and dimensions.
     
  7. arunkumar413

    arunkumar413 New Member

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  8. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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  9. arunkumar413

    arunkumar413 New Member

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    what does the number 42x0.65 and 44x0.35 indicate?
     
  10. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    upload_2017-6-26_6-41-12.png

    "42" is apparently the number of spaces (EDIT: it's 42, not 43 because there are two sides). "44" is the number of pins on that package. 0.65 mm is the center to center distance. 0.35 mm is the pad or stencil width for non-soldermask. Do you know what soldermask is and why it may not be desired for that package?

    Try drawing the whole device in your new CAD program.
     
    Last edited: Jun 26, 2017

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