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Pad Editor thermal pad and anti-pad: when are they applicable?

vavouris

Hi all,

I want to ask about thermal pads and anti-pads and when they apply to a Allegro. I know thew theory behind them, but i do not understand when and how they are used in allegro. Are they applied only on planes? and why only on negate artwork planes? I find useful that you can setup a thermal relief for a specific pad and not go to each pad in each shape and change from the  shape parameters. And when you have a big shape that has many different pads from many different parts, I want to have different thermal reliefs and anti-pads on each one. Is that possible?

Thanks,

Theocharis

  • mcatramb91

    I actually discussed this topic with a co-worker today so it was easy to post it here as well:

    Historically, The Thermal and Anti-Pad geometries in the padstack have been used on Negative Planes and what you define in the padstack is what you see in the shape and in manufacturing output.  They are only applied to Negative Planes with connections using the Thermal Pad Flash Symbol and non-connections using the Anti-Pad geometry but could be a Flash symbol as well.

    For dynamic shapes on non-negative planes you can set the Pin/Via option to Thermal/Anti instead of DRC under Clearance tab of Shape Parameters, connection locations will use the Thermal Pad geometry overall size with Cline based thermal connections and non-connection locations will use the Anti-Pad geometry overall size.   One thing to note , if a Shape clearance DRC is generated after using the Thermal/Anti Pad geometries overall size openings in the shape will automatic grow to resolve the DRC. (Shape to Regular Pad and Drill checks are used on non-negative planes)

    As far as having different Thermal/Anti Pad geometries, there are a number of Pin/Via properties that control voiding behavior in dynamic shapes on a per Pin/Via basis.  Select a Pin/Via and RMB > Property Edit or use Edit > Properties menu then window select the Pins/Vias.  Dynamic Shape Properties begin with  DYN_*  

    Hope this helps,
    Mike Catrambone

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