On Mon, Sep 15, 2014 at 08:41:16AM -0400, Carl Poirier wrote: > On another note, now that the courtyard is found in the module editor, I > think it would be fair to add it to the convention. I personally would go > for a 0.25mm clearance. Anyone objects?
0.25 clearance is the common IPC value for SMD component, measured from the pad edges and then enlarged to enclose the silkscreen drawings. Except for LGA/BGA where is bigger to allow for reworking equipment. The complete table (for the nominal enviroment is): - Aluminum cap 0.5 - LGA/CGA/BGA 0.5 - 1.0 - 2.0 depending on ball size - Chip 0.15 (simple R, L, C) - DFN 0.15 - SODFL, SOTFL 0.15 - Other things 0.25 In short, the exception are flat leads and grid arrays; however if you don't need an aggressive packing using 0.25 for chips ease *a lot* reworking. Aluminum caps are big and 'springy' so they have special arrangements anyway. -- Lorenzo Marcantonio Logos Srl -- Mailing list: https://launchpad.net/~kicad-lib-committers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-lib-committers More help : https://help.launchpad.net/ListHelp
