Actions
Forum Thread Details
  • Replies 2 replies
  • Subscribers 177 subscribers
  • Views 195 views
  • Users 0 members are here
Related

I have four layer board with layer two as a ground plan and the rest signals.

Former Member

The PCB board shop tells me I have overlapped thermal and antipads on my

ground plane.  There is one place on my PCB that I see this.  It's on a

through hole part where the pins are very close together.  I used the

autorouter and I get no DRC errors, however one of the thermal fins is

missing on this part due to an adjacent antipad.  What is the best way to

fix this?  Is there a setting in the DRC tool that can allow the autorouter

to fix this automagically?  I'm using the Eagle default settings now.

 

Thanks in advance.

 

 

 

  • Terry <terryf@custom-solutions.com> wrote:

    The PCB board shop tells me I have overlapped thermal and antipads on my

    ground plane.  There is one place on my PCB that I see this.  It's on a

    through hole part where the pins are very close together.  I used the

    autorouter and I get no DRC errors, however one of the thermal fins is

    missing on this part due to an adjacent antipad.  What is the best way to

    fix this?  Is there a setting in the DRC tool that can allow the autorouter

    to fix this automagically?  I'm using the Eagle default settings now.

     

    See the recent discussion about why using supply layers is so error prone:

     

    --

    Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

     

    Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt

    -

    Tel. 06151 162516 -

    Fax. 06151 164321 -

     

  • Terry wrote:

    The PCB board shop tells me I have overlapped thermal and antipads on my

    ground plane.  There is one place on my PCB that I see this.  It's on a

    through hole part where the pins are very close together.  I used the

    autorouter and I get no DRC errors, however one of the thermal fins is

    missing on this part due to an adjacent antipad.  What is the best way to

    fix this?  Is there a setting in the DRC tool that can allow the autorouter

    to fix this automagically?  I'm using the Eagle default settings now.

     

    Thanks in advance.

     

     

    For inner layers, you don't need thermal pads.  Thermals are only needed

         on outside layers (TOP/1, BOT/16) for soldering through hole parts.

     

    BTW, I run GCPrevue to check my boards before sending them to be

    fabricated.  Some times I have freeDFM.com check my board as well.

    FreeDFM is free and fast (only a few minutes).

    HTH

    -Dave Pollum