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Poll, Which is better for PCB Pads Round, Oval, Octagonal?

Which is better for PCB Pads Round, Oval, Octagonal?

  • Round

    Votes: 0 0.0%
  • Oval (rounded rectangle)

    Votes: 0 0.0%
  • Octagonal

    Votes: 0 0.0%

  • Total voters
    0
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Which is better for PCB Pads Round, Oval, Octagonal?
 

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Re: Poll, Which is better for PCB Pads Round, Oval, Octagona

William At MyBlueRoom said:
Which is better for PCB Pads Round, Oval, Octagonal?

Better from what point of view? hand soldering? wave soldering? pad adhesion?

For a beginner's hand soldering process, the more pad 'land' you have the better. Hence, for compact situations, eg. SIL, DIL, D type connectors, etc. the oval pad wins.

Why bother with a poll? A simple question would have sufficed.

Klaus
 
The round would appear to have more area than an octagon at first, but since PCB layouts are basically square and governed by clearances a square pad would maximize area for a given pad-to-pad clearance. The etching process as well as noise concerns traditionally frowns on 90 deg features and it's less efficient to route wires around sq features. So the octagon is usually used instead of square, and octagon wins over the round every time.

Now octagon vs long is just about what kind of clearance is available. A TO220 pkg for example often requires longs because the package gets mechanical stability from the pads. DIP pkgs, nice but not necessary. Sometimes you have to place stuff so close to a DIP pkg that the longs won't work. Not a crime to use octs.
 
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