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Question about thermal relief (spoke) widths

Former Member

I noticed that thermal relief (spoke) widths are same for 0805 and 0603, about 20 mils.

For SOD-323 they are about 11 mils.

The width of GND polygon where they connect is 10 mils.

 

Is that how it is supposed to be? How Eagle decides that?

 

Thanks.

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  • 0

    Mark Perry wrote:

    I noticed that thermal relief (spoke) widths are same for 0805 and

    0603, about 20 mils. For SOD-323 they are about 11 mils.

    The width of GND polygon where they connect is 10 mils.

     

    Is that how it is supposed to be? How Eagle decides that?

     

    Thanks.

     

    Search for "Thermals" in the manual.

     

    In essence the spoke width is 25% of the drill diameter of the pad. but

    between 1 and 2 wire widths of the polygon.

    For a SMD I believe I read somewhere that it is based on the smallest side

    of the SMD.

     

    Warren

     

     

    --

    Viewed / responded via the newsgroup at

    news.cadsoft.de

     

     

     

Reply
  • 0

    Mark Perry wrote:

    I noticed that thermal relief (spoke) widths are same for 0805 and

    0603, about 20 mils. For SOD-323 they are about 11 mils.

    The width of GND polygon where they connect is 10 mils.

     

    Is that how it is supposed to be? How Eagle decides that?

     

    Thanks.

     

    Search for "Thermals" in the manual.

     

    In essence the spoke width is 25% of the drill diameter of the pad. but

    between 1 and 2 wire widths of the polygon.

    For a SMD I believe I read somewhere that it is based on the smallest side

    of the SMD.

     

    Warren

     

     

    --

    Viewed / responded via the newsgroup at

    news.cadsoft.de

     

     

     

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  • 0 in reply to Former Member

    Warren Brayshaw wrote:

    Mark Perry wrote:

    >> I noticed that thermal relief (spoke) widths are same for 0805 and

    >> 0603, about 20 mils. For SOD-323 they are about 11 mils.

    >> The width of GND polygon where they connect is 10 mils.

    >>

    >> Is that how it is supposed to be? How Eagle decides that?

    >>

    >> Thanks.

     

    Search for "Thermals" in the manual.

     

    In essence the spoke width is 25% of the drill diameter of the pad.

    but between 1 and 2 wire widths of the polygon.

    For a SMD I believe I read somewhere that it is based on the smallest

    side of the SMD.

     

    Apologies, an error previously

    Spoke width is 50% of the pad drill diameter or the smallest side of SMD

    with a minimum width of 1 polygon wire width and a maximum of 2 wire widths.

     

    Warren

     

    --

    Viewed / responded via the newsgroup at

    news.cadsoft.de