voduychau Posted January 31, 2007 Report Share Posted January 31, 2007 we often use library of an EDA software,but i don't like it,because it's not good for hand-made PCBso i design a new one,i'm using orcad layout plusnow,any body can tell me your experience? -what padshape is good?(round,oblong,regtangular,oval...)-how width,how height of the pad is enough ?......please help me! (and please don't ask me "don't design it!" because i still want to design it ;D ) Quote Link to comment Share on other sites More sharing options...
MP Posted February 10, 2007 Report Share Posted February 10, 2007 The size of the pad will be mostly determined by the package and the hole size. You will have to figure this one out. If you want to have a 5 mil ring for solder, you have to add 10 mil to the size of the hole that will be used. This is the pad size.As a standard, through hole pads are round with exception to pin #1 on ICs and headers. Pin #1 is denoted with a square pad in these cases. Many programs will give you an option to use an oval pad. This is just a design preference that makes manual soldering a little easier.Since surface mount chips have pins so close together, you will usually see a rectangular pad in these designs. This allows you more solder surface without getting too close to the next pin.hope this helps you.MP Quote Link to comment Share on other sites More sharing options...
Omni Posted May 12, 2007 Report Share Posted May 12, 2007 Additionally, be careful when placing a pad within a large ground plane.Suggestion: Trying to solder a component in the middle of a large ground plane can be difficult. Quote Link to comment Share on other sites More sharing options...
login
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.