Cheap Multilayer PCB Product introduction: 8 layer HDI pcb 8 layer HDI pcb Plate thickness: 1.2MMCopper thickness :0.036mm (36um) Impedance requirement: 50+/-5%PMinimum aperture: 0.3MM Resistance welding: Green oilF-T test: 100% 聽 2銆? layer HDI pcb blind hole and buried hole design: A through hole can be made before or after multiple layers of lamination. Blind and buried through-holes are added to the PCB through drilling, which is very unstable. It is important that the builder knows and understands the depth of the drill bit. If the hole is not deep enough, it may not provide a good connection. On the other hand, if the hole is too deep, it may degrade the signal quality or cause distortion. If any of these things happen, it will not be feasible. In blind holes, you need to define the holes using a separate drilling file. The ratio of the hole diameter to the bit diameter must be equal to or less than one. The smaller the hole, the smaller the distance between the outer and inner layers. For buried holes, each hole needs to be made using a separate drill file. This is because they are connected to different parts of the inner layer of the board. The ratio of hole depth to bit diameter shall not be greater than 12. If it is larger than that, it may hit other connections on the board. We recommend PCB manufacturing with advanced circuits. This will help ensure that the design and construction of the board, including blind and buried holes, is feasible. Not being prepared and unable to work with quality board manufacturers can lead to increased costs. Our experts have the tools and technology to ensure proper borehole depth. We can ensure that no air remains in the PCB during this process. The coating will be applied correctly to connect the inner layers. 聽 聽 3銆?Concept of HDI blind burials锛? layer HDI pcb锛? In the PCB proofing industry, it is often mentioned that "HDI blind hole" this term. Blind holes are only visible in one of the top or bottom layers of the PCB board. That is to say, blind holes are drilled from the surface, but not through all layers. Buried hole refers to the inner layer through the hole, the hole above and below both sides are in the inner layer of the board, in other words, they are buried in the inside of the board. Form what we call a blind hole process circuit board. The application of blind holes and buried holes greatly reduces the size and quality of HDI (high density interconnect) PCB, reduces the number of layers, improves electromagnetic compatibility, increases the features of electronic products, reduces the cost, and makes the design work more convenient and fast. 聽 4銆?Advantages of blind holes and buried holes: Many PCB boards are small and have limited space, so blind and buried holes can provide more space and options for the board. For example, buried through-holes will help free up space on the surface of the board without affecting surface components or wiring on the top or bottom layers. Blind holes can help free up some extra space. They are typically used for fine-spaced BGA components. Since the blind holes only pass through part of the board, it also means less signal residue. While blind and buried through-holes can be used for many types of PCBS, they tend to be most commonly used for high-density interconnected PCBS or HDI. HDI's are popular because they can provide better power transmission and higher layer density. By using hidden through-holes, this will also help make the board smaller and lighter, which is very useful when creating electronics. They are commonly used in medical devices, tablets, laptops, mobile phones and similar small electronics. 聽 5銆? layer HDI pcb Fabrication Structure: With the development of portable products design towards miniaturization and high density, the design of PCB is becoming more and more difficult, which puts forward higher requirements for the production process of PCB. In most portable products to make the 0.65mm spacing below the BGA package, all use the design process of blind buried holes, then what are blind buried holes? Blind holes: A blind hole is a type of hole that connects the PCB inner wiring to the PCB surface wiring. The hole does not penetrate the entire board. Buried holes: The buried holes are only connected to the through-hole type of wiring between the inner layers, so they are not visible from the PCB surface. 聽 6銆丅entePCB HDI quality assurance: Factory for many years of HDI board manufacturing experience, professional HDI technical team, enough to meet a variety of HDI board manufacturing needs, welcome to know us, we will go all out to serve you. 聽Cheap Multilayer PCB website:http://www.bentepcb.com/multilayer-pcb/