Triode
Well-Known Member
I was taught early on by an electrical engineer who trained me that when you design a PCB for surface mount parts that it is not required but best practice to have traces aligned such that the flow of solder will not pull them out of place. Most often this would mean having the trace into the pad come in line with the part. Or if it is connected to more that one trace, to place them symmetrically.
Now I work with a lot of electronic engineers, and they don't seem to care about this and it doesn't seem to cause problems. I've seen people place 0201 (0603) sized resistors with both traces coming off sideways with the same twist, and not only did no one mention it in the board review, it didn't cause any manufacturing issues at all.
I'm wondering, is it that modern solder mask, placement, or reflow soldering doesn't have this problem, or are they just getting away with it? I don't want to be taking up space to stick to a design rule that turns out not to matter. Some of my designs have hundreds of tiny surface mount components on them, so I also don't want to drop that rule if it does matter. I see that Altium's guide to PCB design mentions this rule, but the design guide of our manufacturer, express manufacture inc., does not mention it.
This question is not crucial at the moment since it appears that no one has a problem with me always places traces in line with the axis, and they also don't care if I don't, but I want to keep with best practices when I can.
Now I work with a lot of electronic engineers, and they don't seem to care about this and it doesn't seem to cause problems. I've seen people place 0201 (0603) sized resistors with both traces coming off sideways with the same twist, and not only did no one mention it in the board review, it didn't cause any manufacturing issues at all.
I'm wondering, is it that modern solder mask, placement, or reflow soldering doesn't have this problem, or are they just getting away with it? I don't want to be taking up space to stick to a design rule that turns out not to matter. Some of my designs have hundreds of tiny surface mount components on them, so I also don't want to drop that rule if it does matter. I see that Altium's guide to PCB design mentions this rule, but the design guide of our manufacturer, express manufacture inc., does not mention it.
This question is not crucial at the moment since it appears that no one has a problem with me always places traces in line with the axis, and they also don't care if I don't, but I want to keep with best practices when I can.