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Allegro 17.5 Padstacks - Rounded rectangle for IPC SMD Footprints - Corner radius value recommendation ?

excellon1

In 17.5 there is the option to do rounded rectangles which is great. I have been thinking of updating my standard IPC-7351 resistors - caps etc to use the new rounded rectangle pads as opposed to the traditional rectangular ones.

Can anyone offer any guidance with respect to a good rule of thumb to apply to the "Corner Radius Value" I'm thinking 5 but not too sure.

Thanks

Paul

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  • steve

    I think you mean 17.2 but in any case if you look at something like PCB Libraries, this uses the IPC standard to build parts and for R's and C's it seems to be using 0.25mm for the radius based on a pad size of 1.16 x 1.82. If you generate a SOIC pad the radius is 0.1 based on a pad size of 1.36 x 0.39. Not sure that helps much but I did have a quick check of IPC7351B and can't see any reference to a preferred value.

  • excellon1
    in reply to steve

    Hi Steve, 17.2...

    That info helps, I too did some hunting around but came up kind of short. I think for the moment I will just abandon the idea and go with the standard. I do see a case in using them in particular when it comes to the solder stencil and having a pad that closely matches that for which paste gets applied to.

    Thanks,

    Paul.

Reply
  • excellon1
    in reply to steve

    Hi Steve, 17.2...

    That info helps, I too did some hunting around but came up kind of short. I think for the moment I will just abandon the idea and go with the standard. I do see a case in using them in particular when it comes to the solder stencil and having a pad that closely matches that for which paste gets applied to.

    Thanks,

    Paul.

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