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EAGLE is a scriptable electronic design automation application with schematic capture, printed circuit board layout, auto-router and computer-aided manufacturing features. EAGLE stands for Easily Applicable Graphical Layout Editor. This group will talk about the problems of using PCB software---Eagle.

Community > Groups > Eagle > To "mirror" or not to "mirror"?
To "mirror" or not to "mirror"?
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A double-sided PCB requires two SMD capacitors to be mounted on the bottom side. In the "package" page I can specify the layers where each element must be. May I use these settings for a specific device so that the .brd layout always assigns this device to the bottom? Or do I make a regular device and use mirror when designing the .brd file?
Statement: This post is only the personal view of the author and does not represent the opinions of


As far as I can see, the main one is it's easier to work "right side up" than in a reversed view. Plus, there's no reason to have "top" components and "bottom" components.

Joshua Mulcahy

If you lay out all your packages for the top layer, then mirror is necessary to put on the bottom.

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