Is it possible to do not use solder mask (tStop) on a specific area of the board?

On 11/12/2014 10:08 AM, Francisco Pinto wrote:

Hi!

 

I designed a board but want to do not use solder mask between the pads

where a specific IC will be soldered. I mean, all the other pads (of

other ICs) should have solder mask but that specific IC should not.

 

What can I do?

 

Thanks in advance.

 

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You could draw a rectangle (or polygon) in the tStop (or bStop) layer to

surround the pads of concern.  If it's a PTH part, you can draw

rectangles on both of these layers.

Remember that the tStop and bStop layers are negative - that is,

wherever you have an object (rectangle, polygon, wire, etc) on the

layer, that's where mask will NOT be.

HTH,

    - Chuck

Many thanks for your prompt reply.

The following picture shows IC10 pads and the surrounding solder mask

(tStop)

I added a rectangle on tStop layer as follows:

Is it correct?

Thank you.

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@viriatus, why would you want to do that, what you have shown?

Maybe I am not thinking/doing the things correctly.

I designed a board and sent it to a pcb factory to be produced. After checking my design they warned me that the space between pads is too small for having solder mask between them and suggested to do not use solder mask on that area. That's the reason why I am trying to remove the solder mask on a specific area of the board.

After checking my design they warned me that the space between pads is too small for having solder mask between them and suggested to do not use solder mask on that area.

Ok, why not just tell them to remove the solder mask where they can't print it.

I already did. I am asking this to know how to proceed if, for some reason, I needed to change my design accordingly.

...if, for some reason, I needed to change my design accordingly.

I would not change anything in your design. There will always be something where you tell them, "it's ok to not print this or that, or remove this, ....".

Thank you Friedrich. I guess you are right.