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Pcb best trace width microcontroller1/24/2024 Different stacks had 1 oz and 2 oz copper sheets. You cannot say that less copper makes for a cheaper board because boards start out as 4 foot by 8 foot sheets with copper on one or both sides. Also LVDS and RF required that corners be 45 degree turns with a outer cut that was 1.6 times the trace width.Ĥ) There is no single width that fits all applications. Analog traces crossed over digital traces at right angles to avoid analog noise.Ģ) Power traces were 30 mils wide but 50 to 100 mils wide if they had to carry several amps of current.ģ) Data traces were 20 mils wide and 3 mils wide/3 mils spacing for LVDS which had a dedicated ground trace under it that was 10 mils wide. Analog and digital grounds were always separate until they met at the power connector or an ADC, which was the end-point for the analog signals. Ground pours in RF areas had a diamond shaped pattern (no copper for 50 mils) to break up standing waves. Given those guidelines I used the following loose rules:ġ) Ground traces were more like copper pours in that they covered broad areas of the board. Also I was in touch with the board house often to discuss minimum trace widths and minimum slot widths (to prevent crepage between high voltage or high impedance traces, often 31 mils was the limit). For me it depended on whether the trace was for power, ground or data. There are fundamental reasons for traces being a certain width, whether you use 1 oz or 2 oz copper, and how many layers you have.
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