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Use Extended Footprint Names

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lalexman View Drop Down
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    Posted: 30 Jun 2013 at 6:56am

If you enable "Use Extended Footprint Names" what does that do to the footprint names?

Is it only available for "USR" footprints?
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 2013 at 3:06pm

The original IPC-7351 footprint naming convention does not include component "Lead Length" tolerances, Thermal Tab sizes, BGA Ball Diameter or various pin assignments into account. Therefore, the same component with different tolerances can produce a different land size and spacing with the same footprint name.

A footprint name of SOP50P710X120-14N can have version A, B, C, D which do not indicate the variances in Thermal Tab or Lead Length -

  • SOP50P710X120-14AN
  • SOP50P710X120-14BN
  • SOP50P710X120-14CN

There are 3 component features that affect the footprint name

  1. QFN, PQFN, SON, PSON Square Thermal Tab Size = QFN50P500X500X120-14NT300
  2. Rectangle Thermal Tab Shape = QFN50P500X700-20NT300X500
  3. SOP, QFP, SOD, SOT Gull Wing Lead Length Tolerance = SOP50P710X120-14NL50
  4. BGA Ball Size = BGA121C50P11X11_600X600X100NB23
For "component mfr. recommended footprint pattern" drop the environment level character after the pin qty. - SOP50P710X120-14N
 
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