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Solder mask for BGA

autodeskguest

BGA solder-ball land pads can be solder mask defined (SMD) or non-solder

mask defined (NMSD). SMD the mask is smaller than the pad, NSMD the mask

is larger than the pad. On a board with several different parts, it is

necessary to have different solder masks.

 

How can I do this? In the library package definition for each part, I

can only turn the mask on and off.

In the layout, I only have access to the global DRC, which affects all

parts.

 

Is there a workaround?

 

Thanks,

Dave

 

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  • Richard Hammerl wrote:

    DWS schrieb:

    BGA solder-ball land pads can be solder mask defined (SMD) or

    non-solder mask defined (NMSD). SMD the mask is smaller than the pad,

    NSMD the mask is larger than the pad. On a board with several

    different parts, it is necessary to have different solder masks.

     

    How can I do this? In the library package definition for each part, I

    can only turn the mask on and off.

    In the layout, I only have access to the global DRC, which affects all

    parts.

     

    Is there a workaround?

     

    Thanks,

    Dave

     

    Switch off the automatic solder stop mask generation in the

    library and draw the mask with the CIRCLE command (width = 0)

    as wanted in layer 29, tStop.

     

    Maybe let it automatically generate the small ones, and draw only thoose

    you want bigger?

     

Reply

  • Richard Hammerl wrote:

    DWS schrieb:

    BGA solder-ball land pads can be solder mask defined (SMD) or

    non-solder mask defined (NMSD). SMD the mask is smaller than the pad,

    NSMD the mask is larger than the pad. On a board with several

    different parts, it is necessary to have different solder masks.

     

    How can I do this? In the library package definition for each part, I

    can only turn the mask on and off.

    In the layout, I only have access to the global DRC, which affects all

    parts.

     

    Is there a workaround?

     

    Thanks,

    Dave

     

    Switch off the automatic solder stop mask generation in the

    library and draw the mask with the CIRCLE command (width = 0)

    as wanted in layer 29, tStop.

     

    Maybe let it automatically generate the small ones, and draw only thoose

    you want bigger?

     

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