Stop mask on Via : define the solder mask inside the via

Hi all,

I have a question concerning the via and the solder mask. Actually I understood how to use the parameters in the DRC, but I would like to define the solder mask inside the via like in the first photo. But with the DRC I couldn't find a different way than created a circle in the tstop layer.

The reason why is that the manufacturer asked me to do a solder mask with a radius -25µm, as my vias have a diameter of 0.65mm the solder mask should have a diameter of 0.65mm - 25µm.

Do you have any idea how I could do ?

Thanks for your help !

I'm using eagle 8.3.2

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WarrenBrayshaw over 6 years ago

Hi

Nothing available directly within Eagle but it could be done with a ULP
You could be convinced of this by having a look at the ulps that come with Eagle. There is one that is close but does the opposite of what you are asking for. I can provide the name right now but Its the last one listed in my version (7.7) and contains the word 'via' in its name.
It does the opposite of what you want but seeing its abilities will convey to you that a new ULP or modification of that one could achieve what you desire.

What you board manufacturer is asking is new to me. Would you please provide the link to their website so I/we can review their design rules for manufacture.

Cheers
Warren
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WarrenBrayshaw over 6 years ago in reply to WarrenBrayshaw

OK

I see now where this all came from. Solder Mask Defined pads (SMD) and Non-Solder Mask Defined pads NSMD

Here is a good article https://medium.com/supplyframe-hardware/confessions-of-a-pcb-designer-on-solder-mask-e592b45e5483

In the new world, Eagle will likely need to cater for this treatment.

Cheers
Warren
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salomonreinach over 6 years ago in reply to WarrenBrayshaw

Thank you for your answer ! Indeed the article really well explained that !

I have no idea if it's difficult or not to do that with an ULP, the easiest way seems to use an other software that handle this case.

Rémy
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WarrenBrayshaw over 6 years ago in reply to salomonreinach

Hi Again

There is a downloadable ULP here
http://eagle.autodesk.com/eagle/download/2075

It gets closer to what you want.

Going forward, I feel this one would be a good candidate to modify so that all one needs to specify is the required distance less than the outer diameter of the via restring. In your example that would be 25µm
I may have a go at that so stay tuned over the next week or so

HTH
Warren
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salomonreinach over 6 years ago in reply to WarrenBrayshaw

Thank you for your help

Rémy
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WarrenBrayshaw over 6 years ago in reply to salomonreinach

Here you go - ULP attached
Use it to create solder mask for vias relative to the outer diameter of the via.
Enter negative measurements for stop mask less than the via diameter
Enter positive numbers for stop mask greater than the via diameter.

Change the txt file extension to ulp

Enjoy
Warren

Attachments:
stop-mask-defined-via.txt.zip
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WarrenBrayshaw over 6 years ago in reply to salomonreinach

Here you go - ULP attached
Use it to create solder mask for vias relative to the outer diameter of the via.
Enter negative measurements for stop mask less than the via diameter
Enter positive numbers for stop mask greater than the via diameter.

Change the txt file extension to ulp

Enjoy
Warren

Attachments:
stop-mask-defined-via.txt.zip
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