Component foot print, solder resist and solder stencil

[dansku]

Hello guys, I am making the footprint for a OSRAM led (http://www.mouser.com/ds/2/311/LCW%20CRDP.CC-335261.pdf)

Because it is a 1W led, the datasheet suggests to have a bigger copper area, solder resist area, etc, like the picture bellow.
I would like to know what is the best way to make this footprint on altium?

Thank you very much! 

[T3sl4co1l]

Make the footprint area as shown, but do not follow their suggested solder resist size: it is better to maintain 3-4 mils mask expansion, from rule; compensate by making the pads smaller in the directions where copper pour connects.  This avoids having solder mask partially cover the pad areas, which makes the surface uneven, and makes solder joints prone to cracking.

When placing on PCB, pour around the pads with polygons.  Set a design rule so they connect without thermal relief.  Shape them to connect with the pads, as recommended.

Tim

[dansku]

So I would just make the footprint are as shown (straight red line) and then adding the extra copper under solder mask on the board design?

Is there a way to do that in the component edit to save time?

Thanks

[T3sl4co1l]

You can place Regions around the pads, in the footprint, and they will connect automatically.  But that reduces your options on reusing the footprint.

I mean, you could design an entire PCB just within footprint view, but that wouldn't be very useful.  I suggest keeping footprints as simple as possible, so you have as many layout options as possible.  Even if you'll only ever use the footprint once, in some simple lighting thing or whatever, I still recommend it.

Tim

[dansku]

You can place Regions around the pads, in the footprint, and they will connect automatically.  But that reduces your options on reusing the footprint.

I mean, you could design an entire PCB just within footprint view, but that wouldn't be very useful.  I suggest keeping footprints as simple as possible, so you have as many layout options as possible.  Even if you'll only ever use the footprint once, in some simple lighting thing or whatever, I still recommend it.

Tim

I see your point, I will do that, thanks!

[technotronix]

Either use the "IPC Compliant Footprint Wizard" or "Component Wizard".

[T3sl4co1l]

Uhhh... hm.

It's a nonstandard package.

I guess you could use an LGA or PSON prototype, fudging the numbers as needed.

But you'd probably spend more time entering the numbers (or trying to find them, if they provide package dimensions and tolerances at all) than just doing it by hand.

Tim