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Multilayer Printed Circuit Boards

Printed Circuit Board (PCB), also known as Printed Circuit Board or Printed Circuit Board. Multilayer printed boards refer to printed boards with more than two layers, which are composed of connecting wires on several layers of insulating substrates and solder pads used for assembling and welding electronic components. They not only have the function of conducting the circuits of each layer, but also have the function of mutual insulation.

PCB multilayer board refers to a multi-layer circuit board used in electrical products, which uses more single or double-sided wiring boards. A printed circuit board that uses one double-sided inner layer, two single-sided outer layers, or two double-sided inner layers, and two single-sided outer layers, and is interconnected with conductive graphics according to design requirements through positioning systems and insulating bonding materials, becomes a four or six layer printed circuit board, also known as a multi-layer printed circuit board.

    Characteristics of PCB Multilayer Board

    The biggest difference between a multi layer PCB board and a single or double panel is the addition of an internal power layer (maintaining the internal power layer) and a grounding layer. The power and ground network are mainly wired on the power layer. However, multi-layer board wiring is mainly based on the top and bottom layers, supplemented by the middle wiring layer. Therefore, the design method of multi-layer boards is basically the same as that of double-sided boards, and the key lies in how to optimize the wiring of the internal electrical layer to make the wiring of the circuit board more reasonable and have better electromagnetic compatibility.

    Process Flow of PCB Multilayer Board

    process flow
    Printed circuit board upper board with completed graphics → acidic degreasing → scanning water washing → secondary countercurrent water washing → micro etching → scanning water washing → secondary countercurrent water washing → copper plating prepreg → copper plating → scanning water washing → tin plating prepreg → tin plating → secondary countercurrent water washing → lower board

    The difference between a double-sided PCB board and a single-sided PCB board is that the single panel circuit is only on one side of the PCB board, while the circuit of a double-sided PCB board can be connected between the two sides of the PCB board with a through hole in the middle. 

    product parameters

    Feature AREX´s technical specification
    Number of layers 4 – 22 layers standard, 30 layers advanced, 40 layers prototype.
    Technology highlights Multiple layers of epoxy glass fiber bonded together with multiple layers of copper of varying thicknesses.
    Materials High performance FR4, halogen-free FR4, low loss and low Dk materials
    Copper weights (finished) 18μm – 210μm, advanced 1050μm / 30oz
    Minimum track and gap 0.075mm / 0.075mm
    PCB thickness 0.40mm – 7.0mm
    Maxmimum dimensions 580mm x 1080mm, advanced 610mm x 1400mm
    Surface finishes available HASL (SnPb), LF HASL (SnNiCu), OSP, ENIG, Immersion Tin, Immersion Silver, Electrolytic gold, Gold fingers
    Minimum mechanical drill 0.20mm
    Minimum laser drill 0.10mm standard, 0.075mm advanced