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SMD package confusion

Former Member

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.

--

John Bachman, W1JGB

AnaTek Corporation

 

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  • 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.

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

Reply

  • 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.

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

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