Pcb best trace width microcontroller7/14/2023 I can't give you the limits off the top of my head, but you can research it if you ever need to do that. If you ever use something thicker than 1 oz (35 um) copper, you will want to increase your trace width and spacing. Stick to Using Thicker Boards Greater Mechanical Support: this type of board is perfect for circuits that use heavier components. Best is 5mils, but 4mils is OK, too.Īlso, the copper thickness affects the minimum trace width. If you need to mass produce PCB's at low cost, the minimum trace width should not be pushed too hard. There is some relationship with trace width and board cost in mass production. There are numerous calculators that can be found online that will tell you what your trace widths need to be based on IPC standards. IPC-2221 generally governs trace widths for given currents. So a 10 mil trace separated from GND by a 5 mil dielectric will be around 50 Ohms characteristic impedance.įor more accurate numbers, you can use a trace impedance calculator online. 2 Answers Sorted by: 2 You are correct, the widths are listed in inches so '0.016' means '0.016 inches', or 16 mil. This is for traces on top or bottom, not inner-layer traces. One useful rule of thumb is that a trace will have approximately 50 Ohms impedance when the trace width is double the height from trace to plane. The second major factor which affects impedance is the distance from trace to the nearest plane. Video signals usually are required to be routed at 75 Ohm impedance if they go off-board. RF signals, such as GPS or bluetooth or wifi antenna signals, have very exacting trace impedance requirements (usually 50 Ohms). In those cases, the trace width must be chosen so that the impedance is correct. Sometimes this matters.įor example USB and ethernet. Wider traces have lower characteristic impedance (transmission line impedance) than narrower traces. The resistance of the traces is seldom important for signals.
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