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  3. Allow overlapping soldermask

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Allow overlapping soldermask

SOT23
SOT23 over 2 years ago

Hello,

I have some issues with the soldermask constraint set available in Constraint Manager > Analysis Mode.

At the moment, my constraints are set like this : 

And I have ticked the option Allow overlapping soldermask in Analysis Mode > Design for Fabrication.

Still, I have this kind of errors showing up : 

Info on the errors says : 

Class: DRC ERROR CLASS

  Subclass:        SOLDERMASK_TOP
  Origin xy:       (28.5588 37.5420)
  Constraint:      Symbol Soldermask to Pad Soldermask Spacing
  Constraint Set:  SOLDERMASK_SPACING
  Constraint Type: DESIGN
  Constraint value: 0.1 MM
  Actual value:     0 MM
  - - - - - - - - - - - - - - - - - - - -
  Element type:    SHAPE
  Class:           PACKAGE GEOMETRY
  Subclass:        SOLDERMASK_TOP
  RefDes:          MA8
  - - - - - - - - - - - - - - - - - - - -
  Element type:    VIA
  Class:           VIA CLASS
  origin-xy:    (28.4088 36.9420) 
  Part of net:       GND
  Connected pins:      1 ( TOP )
  Padstack name:   V65H30
  Usage:           Through_via  
  CIRCLE_DRILL  :  0.3000   Plated


The via is covered by 1:1 soldermask circle. As you can see, the soldermask shape from the symbol and the soldermask from the via are overlapping entirely. Still, Allegro throws an error for each via... Why is this happening ? As I understand it, the "Allow overlapping soldermask" should... Allow soldermask to overlap, right ? :p 

I don't want to remove the "Soldermask to pad and cline" DRC option because it allows me to spot places where soldermask could be uncovering a cline. But I want Allegro to allow soldermask that completly overlap. Is there a way to do that ?

Thank you in advance !!

PS : As a side note, the Info text from the "Allow overlapping soldermask" option is missing in the Analysis Mode box.

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  • John T
    0 John T over 2 years ago

    I see this question is outstanding. Please check Setup > Constraints > Modes > Design Options > Spacing Options > Suppress DRC on exploded pins

    This attribute when set would suppress the DRC behaviour on exploded pins when one of the following property is applied at the Board/Symbol Drawing level or at the Symbol Instance level in Board.
    NODRC_SYM_SAME_PIN
    NODRC_SYM_SAME_PIN_SOLDERMASK
    NODRC_SYM_SAME_PIN_PASTEMASK

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