Mar 9, 2006 #1 V v_kumar Full Member level 5 Joined Jun 2, 2004 Messages 272 Helped 18 Reputation 36 Reaction score 3 Trophy points 1,298 Location India Activity points 1,964 help can anyone tell me whether there is any formulae for drill size to pad size how to decide the pad size. e.g if drill - 24mil than pad - ? (how to decide it any formulae?)
help can anyone tell me whether there is any formulae for drill size to pad size how to decide the pad size. e.g if drill - 24mil than pad - ? (how to decide it any formulae?)
Mar 9, 2006 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 Pad size calculation min. P = (2 x R) + FA + D P = Pad size R = Annular ring FA = Fabrication allowance D = Drill or tool diameter Details at: https://www.brockstedt.de/en/desi/padsize.html Used units: 40 mil approx 1.00 mm 10 mil approx 0.25 mm 4 mil approx 0.10 mm Regards, IanP
Pad size calculation min. P = (2 x R) + FA + D P = Pad size R = Annular ring FA = Fabrication allowance D = Drill or tool diameter Details at: https://www.brockstedt.de/en/desi/padsize.html Used units: 40 mil approx 1.00 mm 10 mil approx 0.25 mm 4 mil approx 0.10 mm Regards, IanP
Mar 10, 2006 #3 R Rame Full Member level 6 Joined Dec 23, 2005 Messages 373 Helped 47 Reputation 94 Reaction score 7 Trophy points 1,298 Location BANGALORE Activity points 3,810 hi, It again depends on the complexity of the board,for 24 mil drill min 10 mil more can be added,especially for via. If it is for any components, then we need to add more say 15 r 20 mil depends upon the requirement,for reliabliity. Hope this will help u. Regards Ramesh
hi, It again depends on the complexity of the board,for 24 mil drill min 10 mil more can be added,especially for via. If it is for any components, then we need to add more say 15 r 20 mil depends upon the requirement,for reliabliity. Hope this will help u. Regards Ramesh
Mar 13, 2006 #4 V v_kumar Full Member level 5 Joined Jun 2, 2004 Messages 272 Helped 18 Reputation 36 Reaction score 3 Trophy points 1,298 Location India Activity points 1,964 Is there any similar formulae for SOLDER MASK AND PASTE MASK THANKS
Mar 13, 2006 #5 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 SOLDER MASK: Swell solder mask 13 mil (.013) larger than the Pad, SMT or Non-Plated hole size. If LPI (liquid photo image-able) solder mask is required swell to 5 mil (.005). Click to expand... **broken link removed** Regards, IanP
SOLDER MASK: Swell solder mask 13 mil (.013) larger than the Pad, SMT or Non-Plated hole size. If LPI (liquid photo image-able) solder mask is required swell to 5 mil (.005). Click to expand... **broken link removed** Regards, IanP