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SMD pads accessible from multiple layers

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gonadgranny 7 years ago

Hi all. I recently ordered my first batch of PCB's (first ive ever created) and was very happy with the quality indeed so thats great. problem is i thought that if i set the pads to 'All' on Layer, it would be accessible from all layers. i found out the hard way that this was not the case. So my question is: what is the standard way of allowing an SMD pad to be accessible from multiple layers? would it just be to use a via? Thanks. Danny.

Comments

andyfierman 7 years ago

To understand the difference between `Top layer` or `Bottom Layer` (SMD) and `All Layer` pads and to avoid this problem in the future, please see this post: https://easyeda.com/forum/topic/Multi_layer_pads_not_connected-jXtnFyQ8q

gonadgranny 7 years ago

Ok so vias *are* the way for SMD pads then...thanks Andy!

andyfierman 7 years ago

Which is the same as making an `All Layers` pad with a (small) hole in it. See also: https://easyeda.com/forum/topic/VIA_and_PAD-1bKSecywI https://easyeda.com/forum/topic/VIA_and_PAD-YYy7DZzVT

andyfierman 7 years ago

Beware that putting via(s) into pads can cause solder to wick down the via(s) away from the joint. You would probably be safer to just take a short track out of the SMD pad (on the top or bottom layer) and then place a via at the end of that short track.

gonadgranny 7 years ago

Great, I'll do that then. Can you see any problems with putting the via inbetween the two SMD pads of a 1206 sized resistor for example? It should fit in there ok....

andyfierman 7 years ago

As long as there's no solder nearby (i.e. wave soldering!) that can wick up the via hole and push up against the bottom face of the component. Tented or plugged vias can fix that issue but you'll need to: 1. email support to check with them if they can manufacture the board that way. 2. document this information in the `Document` layer of the PCB **and** in the `Remark` section of the PCB order form.

gonadgranny 7 years ago

Thanks again Andy. would i be correct in assuming that vias are tented by default? they appear to be covered in the preview image. also, could you recommend a size limit for the hole in order for tenting to work? currently mine are 15.75mil

andyfierman 7 years ago

Sorry but those are questions for support. My knowledge of the PCB fab processes is not that deep.

gonadgranny 7 years ago

Ok, sorry i was treating you as if you were support! thanks again.

andyfierman 7 years ago

No problem. :)

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