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====== PCB Footprint Guide ======
  * Stuart Brorson's footprint [[http://www.brorson.com/gEDA/land_patterns_20070805.pdf|footprint guide]]
  * [[http://pcb.geda-project.org/pcb-cvs/pcb.html|PCB manual]]
  * The PCB FAQ: [[geda:pcb_tips]].
  * The PCB Quick-Reference has info on [[geda:pcb-quick_reference#footprint_reference|footprints]]
  * [[ gEDA:PCB Footprint Naming Conventions ]] : read this to learn how to //name// your footprint files.

==== Footprint basics ====
   * There are two types of footprints: M4 and NEWLIB.
   * The best tools for creating footprints are PCB (wysiwyg), TEXT EDITOR (fast, accurate), SCRIPTING (powerful).
   * For drawing footprints in PCB, refer to:  (insert a WYSIWYG footprint creation guide)
   * **For writing footprints in text, refer to:**
         * " //Footprint Creation for the Open-Source Layout Program "PCB"// written and maintained by Stuart Brorson
         * Footprints wiki page.  [http://wiki.geda-project.org/geda:pcb_footprints]
   * **For Scripting footprints:**
         * Darrell Harmon's Footgen:[[http://dlharmon.com/geda/footgen.html]]
         * DJ Delorie's Dual Pad Generator: [[http://www.gedasymbols.org/user/dj_delorie/tools/2pad.html]]
         * DJ Delorie's DIL Pad Generator: [[http://www.gedasymbols.org/user/dj_delorie/tools/dilpad.html]]
         * Stefan Salewski's Footprint Generator: [[http://www.ssalewski.de/SFG.html.en]]
   * Other things you may find helpful: calculator, paper+pencil, datasheets, calipers, spreadsheet.

==== PCB Footprint FAQ ====

=== Can I have two pads/pins with the same pin-number? ===
"Yes, totally.  This is how you create oval shaped copper around pins, or funny shaped pads (e.g. square at one end and round at the other) by overlapping two or more pads."

=== How do I make an oval shaped pad around a footprint pin? ===
Simply add a pad on top of your pin and give them the same pin-number.  If the soldermask is kept off both pins, and they overlap, they should appear as one pin on your board.

=== How do I make a 2-sided pad? ===
"Odd as it sounds, this can be necessary for some edge connectors. ... but how do you do it???"

=== Edge Connectors ===

==== Manufacturer references for laying out footprints ====
  * http://www.nxp.com/package
  * http://focus.ti.com/general/docs/packaging.jsp
  * http://www.maxim-ic.com/design/packaging/
  * http://www.national.com/packaging/folders/pkg_index.html
  * http://www.irf.com/package/
  * http://www.onsemi.com/PowerSolutions/supportTechDoc.do?id=1165
  * http://www.analog.com/Analog_Root/Packages/Packages_Home/
  * http://www.linear.com/designtools/PkgInfo.jsp

[[geda:pcb_tips]] covers a lot of Footprint material.  This page and that page need to be reconciled!

===== Sharing PCB Footprints =====

  * The place to share symbols and footprints is [[http://www.gedasymbols.org | gedasymbols.org]]

  * You can find many PCB footprints at [[http://www.luciani.org/geda/pcb/pcb-footprint-list.html|John Luciani's footprint page]] 

  * You can share [[http://opencircuits.com/PCB_Footprints | gEDA footprints at Open Circuits]].
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