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EDA => Proteus => Topic started by: DiBosco on August 10, 2017, 09:09:38 am

Title: Is it possible to create a NTPH pad with a solder resist clearance?
Post by: DiBosco on August 10, 2017, 09:09:38 am
Folks,


I've been asked to ensure there is no solder resist round a non plated through hole (I'm not convinced this is necessary, but you gotta do what you gotta do - or at least what the boss says).

I can't see a way of doing this. I can't even draw a void around a pad on the solder resist layer as far as I can tell.

Anyone know of a way to achieve this please?

Many thanks! :)

Title: Re: Is it possible to create a NTPH pad with a solder resist clearance?
Post by: DiBosco on August 10, 2017, 10:37:22 am
Looks like you have to create a padstack that uses pins with different attributes on the resist layers and use that to create a new part. 
Title: Re: Is it possible to create a NTPH pad with a solder resist clearance?
Post by: electrolust on August 10, 2017, 11:43:17 pm
I can't even draw a void around a pad on the solder resist layer as far as I can tell.

The guard gap setting of a pad defines the gap to the resist.  I think the default is 5mil.  0 = no gap.  "not present" = tented/covered pad.

For a non-plated hole, will a padstack with 'none' selected for every layer work?
Title: Re: Is it possible to create a NTPH pad with a solder resist clearance?
Post by: electrolust on August 11, 2017, 12:13:07 am
Talk about timing.

I just came across this error dialog in the circular pad creation dialog:

Quote
If you are trying to create a hole that is 'only a hole' with no copper, you can place a pad, edit it, and set it to be on the Drill Layer.

So if you do that, maybe the guard gap setting will be honored and you end up with your NPTH with resist expansion.