Multilayer Printed Circuit Boards from China - Quality Solutions by Leading Suppliers and Factory
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 Steps
Printed circuit board upper board with completed graphics
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acidic degreasing
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scanning water washing
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secondary countercurrent water washing
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micro etching
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scanning water washing
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secondary countercurrent water washing
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copper plating prepreg
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copper plating
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scanning water washing
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tin plating prepreg
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tin plating
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secondary countercurrent water washing
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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 |
| Maximum 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 |
Frequently Asked Questions (FAQ)
What is the main difference between a multilayer PCB and a single or double-sided board?
The primary difference is the addition of internal power and grounding layers. While single and double-sided boards route signals strictly on outer surfaces, multilayer PCBs utilize internal electrical layers to route power and ground networks, optimizing space and performance.
How is the wiring structured on a multilayer PCB?
Wiring is primarily routed on the top and bottom layers, which is then supplemented by the middle wiring layers. The design relies heavily on optimizing the layout of the internal electrical layers to ensure better electromagnetic compatibility (EMC).
What is the maximum number of layers that AREX can manufacture?
AREX offers 4 to 22 layers for standard production, up to 30 layers for advanced applications, and up to 40 layers for prototype boards.
What materials and surface finishes are available for these multilayer boards?
We support high-performance FR4, halogen-free FR4, and low loss/low Dk materials. Available surface finishes include HASL (SnPb), LF HASL (SnNiCu), OSP, ENIG, Immersion Tin, Immersion Silver, Electrolytic gold, and Gold fingers.
What are the limits for mechanical and laser drilling on these PCBs?
The minimum mechanical drill diameter is 0.20mm. For laser drilling, the standard capability is 0.10mm, with advanced capabilities reaching down to 0.075mm.