Electronic – PCB copper thickness with small pitch SMT components

pcbpcb-assemblysurface-mount

I typically use 2 ounce copper as rule for all my PCBs. On a recent board I am using a 0.5mm pitch, relatively large micro, and noticed the pads aren't very flat. Assembly went fine with the protos, but I'm wondering if 1 once copper would provide for a flatter landing service. Does anyone have any experience with using 1 and 2 ounce copper with small pitch devices and/or any advice on assembly reliability related to copper thickness for such devices?

Best Answer

Unless you need high-current capability, 1 oz is the default thisckness. Line definition can be impaired with increased thickness, so only use when necessary.