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Pad size

amerdsp

What is good practice when you design a new package?  Does the pad size

equal to the median mentioned in the datasheet or the maximum? If a

datasheet states that the pad width is 0.23 +.07 -.05 mm should my pad

be 0.3 mm?

 

Thank you

 

A

 

  • hi,

     

    while designing a new package, i always be careful about drc violation.

    If a pad width will not result a drc violation then it may be wide

    different from the one specified in a datasheet. So, using the maximum

    values for a pad will be a good choice. Yes, off course i this my opinion.

     

    Cheers,

     

     

    firat

     

    Amer Abufadel yazm?s,:

    What is good practice when you design a new package?  Does the pad size

    equal to the median mentioned in the datasheet or the maximum? If a

    datasheet states that the pad width is 0.23 +.07 -.05 mm should my pad

    be 0.3 mm?

     

    Thank you

     

    A

     

  • If it is a through-hole pad, I'd suggest that you take the maximum value

    and even some 30% margin to have space for solder flow, while soldering.

     

    If it is a SMD pad, I'd do it using maximum dimensions and increase it

    50% 'outside' the component, to have space to heat the pad for reflowing.

     

    Cheers,

    Pedro

     

    Amer Abufadel wrote:

    What is good practice when you design a new package?  Does the pad size

    equal to the median mentioned in the datasheet or the maximum? If a

    datasheet states that the pad width is 0.23 +.07 -.05 mm should my pad

    be 0.3 mm?

     

    Thank you

     

    A