Como determino a largura dos traços ao projetar uma PCB?

Trace width and trace (or copper) space go hand in hand for a minimum value.

4/4	Impact yield and increase cost
6mil	With very high yield for most PCB houses
8/8	Melhorar
12/12	Can be made by PCB houses which is even not good at QA

What is the finest pitch of parts? If you are using 0.4mm pitch BGA, you will need very narrow traces. Only for THT you will probably use larger traces.
Designing with a grid.In the days of thru-hole with 0.1″ typical component placement pitch, a grid of 0.025″ make routing easier. These days good PCB software will ‘push and shove’ so grid, and trace width/space becomes not important. I have typically routed on a 1 mil grid. Guess how does this effect trace width? The trace + space will equal your grid setting.
The most important factors are current carrying requirements and Integridade do Sinal. You need wider traces for higher current. Use a PCB calculator to determine your requirements or look to an IPC standard. For signal integrity, if you need controlled impedances the trace width will be a critical factor.
Last is espessura de cobre.If you use 1/2 oz, 1 oz, 1 1/2 oz, 2 oz, 3 oz, or even higher, the spacing and minimum trace with will increase. Etching is not limited to vertical removal of copper so the PCB manufacturer will have to edit your Gerber (or other) file to compensate.

consulte Mais informação: Compreendendo diferentes tipos de pacotes BGA

#PCB Design

OliverSmith

Oliver é um engenheiro eletrônico experiente, especializado em design de PCB, circuitos analógicos, sistemas embarcados, e prototipagem. Seu profundo conhecimento abrange a captura esquemática, codificação de firmware, simulação, disposição, teste, e solução de problemas. Oliver se destaca em levar projetos desde o conceito até a produção em massa usando seus talentos de design elétrico e aptidão mecânica.