How to make top layer polygon without solder mask in Eagle?

How to make top layer polygon without solder mask in Eagle?#169030

By username20characters - Mon Mar 03, 2014 4:25 am

- Mon Mar 03, 2014 4:25 am #169030

Hi!

I am trying to design a board, which needs solder mounted heatsinks on top of some SMD mounted transistors.

I have created a polygon on the top layer, which is where the heatsink will be soldered to, but I'm pretty sure that polygon will be covered by a solder mask, when I send the board to production.

Is there any way to prevent this from happening?

Thanks a lot in advance!

Re: How to make top layer polygon without solder mask in Eag#169046

By stratosfear - Mon Mar 03, 2014 3:47 pm

- Mon Mar 03, 2014 3:47 pm #169046

It's really easy. tStop is a negative layer, so anything you put there will not have mask. Just draw your polygon in the tStop layer.

Jon

Re: How to make top layer polygon without solder mask in Eag#169048

By Ross Robotics - Mon Mar 03, 2014 5:13 pm

- Mon Mar 03, 2014 5:13 pm #169048

Using vias to sink heat to a polygon on the other side would significantly increase thermal performance.

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