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  3. Cline connecting to corner of Pad not center

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Cline connecting to corner of Pad not center

BrCoRo
BrCoRo over 1 year ago

Hi all,

I'm working with a QFN50P900X900X100-65N footprint but for some reason the traces going to it will only ever connect to the corner of the SMD pad not the center, any ideas?

I've gone into the package footprint DRA file and that also has the same issue, so I'm assuming its something with the PAD file? 

I'm working on 17.4 if that helps.

Thank you in advance,

Kind regards

B

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  • masamasa
    0 masamasa over 1 year ago

    u need to make sure that "snap to connect point" is on when routing.

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  • BrCoRo
    0 BrCoRo over 1 year ago in reply to masamasa

    Hi,

    I've made sure it is and this is what i'm getting

    hope that show it clearly

    B

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  • masamasa
    0 masamasa over 1 year ago in reply to BrCoRo

    u need to make sure that the origin of the n9857253 symbol is the center of the n9857253 pad. it looks like u assigned the origin at the corner of the pad.

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  • BrCoRo
    0 BrCoRo over 1 year ago in reply to masamasa

    Hi,

    How can I move the origin on the PAD file? does it have to be done within the DRA file of the footprint? or somewhere else?

    Thanks,

    B

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  • BrCoRo
    0 BrCoRo over 1 year ago in reply to masamasa

    Hi,

    How can I move the origin on the PAD file? does it have to be done within the DRA file of the footprint? or somewhere else?

    Thanks,

    B

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  • bengelJF
    +1 bengelJF over 1 year ago in reply to BrCoRo

    Footprint files (.DRA) reference padstack files (.PAD) when they're being built. If you do a right-click > Show Element, it'll tell you the name of the padstack, which should let you search for it on your system.

    If this is a footprint downloaded from the manufacturer or a third-party archive such as SnapEDA, the padstack file is likely bundled with the rest of the files in that download. (Based on the name, I suspect this is the case.)

    You may find out that it's quicker and easier to make your own padstack than to try to fix the existing one. 

    For what it's worth, I've been burned too many times by downloaded footprints. We build up all our footprints from the manufacturer's datasheets using a common set of settings which avoids any issues from generated footprints or somebody on SnapEDA doing a poor job.

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  • BrCoRo
    0 BrCoRo over 1 year ago in reply to bengelJF

    Hi bengel

    Thanks for the explanation. You're right in assuming it's a downloaded file, was hoping to save time with it being an IC.

    in future i'll just make the footprint from scratch as it'll be less frustrating than something as small as an incorrect pad origin point.

    Thanks,

    B

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  • AL202512303326
    0 AL202512303326 7 months ago in reply to bengelJF

    Hi! I've been facing the same issue as the original poster. I identified the issue as the origin being in the wrong place, and fixed the padstack file file, but no matter how I refresh (refreshing the padstack in the footprint file, or in the PCB itself), the issue persists in the PCB editor. Any idea how I could fix it? 

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  • digital1
    0 digital1 7 months ago in reply to AL202512303326

    was the padstack generated from a shape or a proper padstack generated in padstack editor to check if it is a shape open the padstack in padstack editro and it will tell you if it is a rectangle or shape.

    If it is a shape if you have the shape file open it in pcb editor and move the origin

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  • AL202512303326
    0 AL202512303326 7 months ago in reply to digital1

    Yep, that solved it. Thank you!

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