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Paste mask rules for thermal pads

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manu View Drop Down
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    Posted: 20 Mar 2019 at 4:16am
Hello,

What are the exact rules for the thermal pad solder mask ?
I know that it is 50% of the pad but from what size the mask is divided by 4 or more rectangles ?
And what is the rule for the distance between these small rectangles? and the distance between these rectangles and the edge of the copper pad ?

Thanks in advance.
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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: 20 Mar 2019 at 8:36am
The Thermal Tab Rules are located in the "Preferences > Rules" section of Library Expert. 
  • Thermal Tab Solder Mask (+/-)
  • Thermal Tab Pattern Defined Solder Mask
  • Thermal Tab Paste Mask %
  • Thermal Tab Minimum Pattern Space
You define the Thermal Tab values that are best for you to create a custom library that matches your preferences. 

Solder Mask Defined Thermal Pads are a new IPC-7093A standard. 

See this forum post - 

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