> I'm looking for a footprint for a 20A bridge rectifier. > > http://www.diodes.com/datasheets/ds21220.pdf
Just draw it in pcb. Set up a metric grid, 0.1mm, draw the four vias (in order! 1,2,3,4), draw lines on silk. Select all, convert to element, save element to file. Sometimes I edit the footprint file to fix pin numbers. Via drills should be 5 mils bigger than sqrt(x*x+y*y) of the leads (I=1.10mm R=0.8mm, so sqrt(I*I+R*R) = 1.36mm or 53.5 mil, so drill = 58 mil. Via copper is usually 1/3 the distance between drills. E=7.5 mm avg, minus 1.5mm for the drill, is 6mm left. Make the copper 2mm annulus, or 2+1.5+2 = 5.5mm diameter. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user