Sunday 10 May 2015

pcb - What is a "solder mask opening" in a footprint?


In the Luxeon LED datasheet under Solder Pad Design section there is a diagram with 3 crosses around the edges of the LED. They are identified as "4x Soldermask Opening (hatched area)" but I am not entirely sure what it is exactly or why it is used. What are they, what do they achieve and how should they be drawn in Eagle or other software?


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Answer




  1. It is for easy alignment with respect to the outline of the package.

  2. The Luxeon outline shows perfect alignment and easier for optical correction with a vision system on the pick N place machine.


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