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SMD package confusion

e14 Contributor

I am confused by the packages in the smd-ipc.lbr.  For instance C0402 is

2.0 mm X 1.0 mm but the standard package for an 0402 capacitor according

to Kemet is 1.0 mm X 0.5 mm.

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John Bachman, W1JGB

AnaTek Corporation

 

  • On 8/12/2010 10:11 AM, John Bachman wrote:

    I am confused by the packages in the smd-ipc.lbr.  For instance C0402 is

    2.0 mm X 1.0 mm but the standard package for an 0402 capacitor according

    to Kemet is 1.0 mm X 0.5 mm.

     

    Generally you would want the lands to be a little larger than the

    component, if the lands were the same size as the termination faces of

    the component you would not achieve proper solder fillets.

     

    Good question though.

     

    Ryan

     

  • John Bachman wrote on Thu, 12 August 2010 10:11

    I am confused by the packages in the smd-ipc.lbr.  For instance C0402

    is 2.0 mm X 1.0 mm but the standard package for an 0402 capacitor

    according to Kemet is 1.0 mm X 0.5 mm.

     

    The name "0402" tells you directly that the package is nominally 40 x 20

    mils, which is pretty close to 1 x 1/2 mm.  Of course the PCB footprint is

    going to be a bit bigger.  If you make the pads 20 mils bigger than the

    package at the ends and 10 mils on the sides, then you end up with a 80 x

    40 footprint, which is pretty much what you reported.

     

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