source:Industry News release time:2022-11-21 Article author:yu Popular:pcb
① The wires used at the input and output terminals shall not be parallel to each other. It is better to add ground wire between lines to avoid feedback coupling.
② The minimum width of the printed circuit board conductor is mainly determined by the adhesion strength between the conductor and the insulating substrate and the current value flowing through them.
When the thickness of copper foil is 0.05 mm and the width is 1~15 mm, the temperature will not be higher than 3 ℃ when the current is 2 A, so the wire width of 1.5 mm can meet the requirements. For integrated circuits, especially digital circuits, 0.02-0.3 mm wire width is usually selected. Of course, as long as it is allowed, wide wires should be used as far as possible, especially power lines and ground wires.
The minimum spacing of wires is mainly determined by the insulation resistance and breakdown voltage between wires in the worst case. For integrated circuits, especially digital circuits, the spacing can be reduced to 5-8 um as long as the process allows.
③ The corners of printed wires are generally circular arcs, while right angles or included angles will affect the electrical performance in high-frequency circuits. In addition, avoid using large area copper foil as much as possible, otherwise, when heated for a long time, copper foil is easy to expand and fall off. When a large area of copper foil must be used, it is better to use grid shape, which is conducive to eliminating volatile gases generated by the heating of the adhesive between the copper foil and the substrate.
Pad
The center hole of the pad is slightly larger than the diameter of the device lead. If the pad is too large, it is easy to form faulty soldering. The outer diameter D of the pad is generally not less than d+1.2 mm, where d is the lead hole diameter. For high-density digital circuits, the minimum diameter of the pad can be d+1.0 mm
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