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How much do you know about double-side printed circuit boards
2020-11-06
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Author:ipcber      Share

       At present, the mainstream circuit board assembly technology in the SMT industry should not be "full board reflow soldering (Reflow)". Of course, there are other circuit board soldering methods. This full board reflow soldering can be divided into single-sided reflow soldering and Double-sided reflow and single-sided reflow are rarely used by people now, because double-sided reflow can save the space of the circuit board, which means that the production can be made smaller, so most of the boards seen on the market It belongs to the double-sided reflow process.

      Double-sided circuit board characteristics.

      The difference between single-sided circuit boards and double-sided circuit boards is the number of copper layers. Double-sided circuit boards have copper on both sides of the circuit board, which can be connected through vias. However, there is only one layer of copper on one side, which can only be used for simple circuits, and the holes made can only be used for plug-in connections. The technical requirement of double-sided circuit boards is that the wiring density becomes larger, the hole diameter is smaller, and the hole diameter of the metallized hole becomes smaller and smaller. The quality of the metallized holes on which the layer-to-layer interconnection depends is directly related to the reliability of the printed board. As the pore size shrinks, the debris that did not affect the larger pore size, such as brush debris and volcanic ash, once left in the small hole, will cause electroless copper and electroplating to lose its effect, and there will be holes without copper and become holes. Deadly metallized killer.

      There are wiring on both sides of Double-Sided Boards. However, to use wires on both sides, there must be a proper circuit connection between the two sides. The "bridge" between such circuits is called a via. A via is a small hole filled or coated with metal on the PCB, which can be connected with the wires on both sides. Because the area of the double panel is twice as large as that of the single panel, and because the wiring can be interleaved (it can be wound to the other side), it is more suitable for use in circuits that are more complicated than the single panel.