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Design rules modifying package pad sizes?

autodeskguest

I'm pretty new to Eagle or any pcb designing software for that matter. I

was modifying a TO-220 3 pin package into a TO-220 5 pin (straight &

vertical) when I noticed the old pads (dia=auto, drill = 0.04, long)

were quite close together when all 5 are arranged. I need to keep the

drill size at 0.04 but I changed the diameter to 0.05". When I insert

the device with my custom package, the schematic editor alerts that the

library has modified my board and that I need to run the DRC. When I

look at the TO-220-5 package in the board view and compare it to the

TO-220-3 package, the TO-220-5 packge is using the old pad size and not

my new narrower pads. Any ideas on what is going on?

 

Also, any suggestions for a tutorial that explains the DRC settings? I'm

having a difficult time understanding some of the parameters.

 

Have a good one,

Matt

 

  • looks like you've run into the "restring" problem. you can search the

    help or forums for more info, but this is a "VFAQ" topic.

     

    basically, in the DRC dialogs there are also settings for "restring"

    which determines the pad size on parts in a board. the library pads are

    (if I remember) the minimum sizes or something, check the help for real

    info.

     

  • Matt schrieb:

    I'm pretty new to Eagle or any pcb designing software for that matter. I

    was modifying a TO-220 3 pin package into a TO-220 5 pin (straight &

    vertical) when I noticed the old pads (dia=auto, drill = 0.04, long)

    were quite close together when all 5 are arranged. I need to keep the

    drill size at 0.04 but I changed the diameter to 0.05". When I insert

    the device with my custom package, the schematic editor alerts that the

    library has modified my board and that I need to run the DRC. When I

    look at the TO-220-5 package in the board view and compare it to the

    TO-220-3 package, the TO-220-5 packge is using the old pad size and not

    my new narrower pads. Any ideas on what is going on?

     

    Also, any suggestions for a tutorial that explains the DRC settings? I'm

    having a difficult time understanding some of the parameters.

     

    Have a good one,

    Matt

     

     

    ==> http://www.cadsoft.de/faq.htm.en#06012601

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

    CadSoft Support -- hotline@cadsoft.de

    FAQ: http://www.cadsoft.de/faq.htm

     

  • Thanks for the pointers and link to the faq. That explained it quite

    nicely. I'm ok with the default DR except for my one device so I'd

    rather not change the DR and then edit all my other devices. Is it

    possible to exempt a particular device so that the board layout will use

    its library define pad sizes instead of the DR?

     

  • Matt schrieb:

    Thanks for the pointers and link to the faq. That explained it quite

    nicely. I'm ok with the default DR except for my one device so I'd

    rather not change the DR and then edit all my other devices. Is it

    possible to exempt a particular device so that the board layout will use

    its library define pad sizes instead of the DR?

     

     

    No sorry, the Design Rules are valid for all parts. There is no

    exception.

     

     

    --

    Mit freundlichen Gruessen / Best regards

    Richard Hammerl

    CadSoft Support -- hotline@cadsoft.de

    FAQ: http://www.cadsoft.de/faq.htm