PCB Technical - What pcb materials are needed to make pch copy board

PCB board selection of pch copy board company PCB boards generally use copper laminates, and the choice of board layers should be considered in terms of electrical performance, reliability, processing requirements and economic indicators. Commonly used copper laminates are coated with copper phenolic paper laminates, copper epoxy paper laminates, copper epoxy glass cloth laminates, copper epoxy phenolic glass cloth laminates, copper PTFE glass cloth laminates and epoxy glass cloth multilayers A printed circuit board. Laminates of different materials have different characteristics. Epoxy resin and copper foil have excellent adhesion, so the adhesion strength and working temperature of copper foil are relatively high, and they cannot foam in molten tin at 260°C. Glass cloth laminates soaked with epoxy resin are less affected by humidity. The UHF circuit board is preferably coated with a copper PTFE glass cloth laminate.

Flame-retardant PCB boards are also required on electronic devices that require flame-retardant. These PCB boards are laminates immersed in flame-retardant resin.

PCB board size The thickness of the PCB board should be determined according to the function of the PCB board, the weight of the mounted components, the specifications of the PCB board socket, the size of the PCB board and the mechanical load.

Should mainly ensure sufficient rigidity and strength.

Common PCB board thicknesses are: 0.5mm, 1.0mm, 1.5mm, 2.0mm. From the cost point of view, the copper film line is long and the anti-noise ability must be considered. The smaller the PCB board size, the better. However, the size of the PCB board is too small, the heat dissipation is poor, and adjacent wires are easily interfered. The production cost of the PCB board is related to the area of the PCB board. The larger the area, the higher the cost. When designing a PCB board with a chassis, the size of the PCB board is also limited by the size of the chassis shell. The size of the PCB board must be determined first to determine the chassis size, otherwise the size cannot be determined. PCB board.

Generally, the wiring range specified in the prohibited wiring layer is the size of the PCB board. The best shape of the PCB board is rectangular, with an aspect ratio of 3:2 or 4:3. When the size of the PCB board is larger than 200*150mm, the mechanical strength of the PCB board should be considered.

In short, the pros and cons should be considered comprehensively to determine the size of the PCB board.

PCB board component layout Although Protel DXP can automatically lay out, but in fact the PCB board component layout is almost done manually during design.

Shenzhen pch copy board company PCB board assembly layout usually follows the following rules:

1. Special component layout

The layout of special components is considered in the following ways:

1) High-frequency components The shorter the connection between high-frequency components, the better, minimize the distribution parameters of the connection and mutual electromagnetic interference, and the vulnerable components should not be too close.

The distance between the input and the components belonging to the output should be as large as possible.

2) For components with high potential difference, the distance between the high potential difference component and the connection should be increased to avoid damage to the component in the event of an accidental short circuit. In order to avoid the phenomenon of electric power climbing, it is generally required that the distance between the copper film lines with a potential difference of 2000V should be greater than 2mm. If the potential difference is large, the distance should also be increased.

High-voltage equipment should be arranged as far as possible in places that are not easy to reach during manual debugging.

3) Parts with too much weight

These components should have a fixed bracket, and for large, heavy, and more components heating, they should not be mounted on the PCB.

4) Heating and thermal elements

Note that the heating element should be far away from the heat-sensitive element.

5) PCB adjustable components. The layout of adjustable components such as potentiometers, adjustable inductors, variable capacitors, micro switches, etc. should take into account the structural requirements of the whole machine. If the machine is adjusted, it should be placed on the PCB for easy adjustment. If the machine is adjusted, its position corresponds to the position of the adjustment knob on the chassis panel.