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Overlapping solder masks

amerdsp

Hello again,

   Can someone please enlighten me what pad size would you use for the

package on page one of http://focus.ti.com/lit/ml/mpbg832d/mpbg832d.pdf ?

 

It seems to vary between 0.36 mm and 0.46 mm.  However if I use the

larger value, the default solder masks overlap. They do not overlap if I

use the median value.

 

Also what does 0.15 M with a circle mean?

 

Thank you for all your help.

 

A

 

  • On Sat, 21 Mar 2009 08:33:02 +0100, Amer Abufadel <amer.abufadel@gmail.com> wrote:

     

    Hello again,

       Can someone please enlighten me what pad size would you use for the 

    package on page one of http://focus.ti.com/lit/ml/mpbg832d/mpbg832d.pdf ?

     

    It seems to vary between 0.36 mm and 0.46 mm.  However if I use the 

    larger value, the default solder masks overlap. They do not overlap if I 

    use the median value.

    I would just use 0.4mm, since the values given are to indicate the fabrication tolerances. Your fabricated PCB will also have some tolerances so don't make too much of a problem out of it. Also, BGA works best if the pads on the PCB are of the same diameter as those on the BGA chip.

     

    Also what does 0.15 M with a circle mean?

    It is the pad surface area, so approximately 0.15mm².

     

    Thank you for all your help.

     

    A

     

     

     

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