24-layer high-density high-speed PCB
Name: 24-layer high-density high-Speed PCB
Layers: 24 layers
Minimum diameter mechanical hole: 0.25mm
Minimum track/spacing: 75/75um
Minimum plate thickness and hole ratio: 12.8:1
Surface treatment: Immersion Gold (ENIG) 0.05um
Application field: aerOSPace
What is a 24-layer PCB?
A 24-layer PCB is an advanced Multilayer board with 24 copper layers. The PCB includes signal layers, ground planes, and power planes. In addition, this PCB consists of silk screen, solder mask, etc. A 24-layer PCB is about 5mm thICk. It provides dimensional stability due to the high number of layers in it.
The manufacturer effectively arranges the ground and signal layers. This helps ensure that the PCB is compatible with HDI applications. These applications are high density interconnects. The materials used in the 24-layer PCB ensure a low dielectric constant. Additionally, the dielectric materials used in this advanced multilayer board are thin. So this helps to create tight coupling between layers.
Materials for 24-layer PCBs
A 24-layer PCB contains different materials in its manufacture. It uses materials such as copper foil, FR4, CEM3 and epoxy resin. In this PCB, the manufacturer presses and bonds the copper foil and fiberglass resin material together. FR4 is a PCB material that provides sufficient rigidity in electronics. It provides sufficient glass transition temperature.
Other materials used for 24-layer PCB fabrication include copper foils and prepregs. 24-layer PCBs can have different copper thicknesses. The thickness and number of layers of copper help it conduct high current loads.
What is a 24-layer PCB stackup?
A 24-layer PCB stackup is an arrangement of the upper layers on a circuit board. In a multilayer PCB, there are several ways to place copper layers on the board. Manufacturers consider a few important factors before arranging for a multi-layer stack.
In a 24-layer stack, there are routing layers, ground planes, and power planes. The wiring layer can be the top layer, middle layer or bottom layer. Ground and power planes are very important in this stackup.
The routing layer creates interconnections between components. Manufacturers can place routing layers on the bottom, top or middle layers. It depends on the application requirements of the board. Signal routing is a critical part of multilayer boards. The stack-up configuration of a 24-layer PCB determines its functionality. A well-aligned stackup will ensure signal routing in the PCB.
24-layer PCB manufacturing
The manufacture of a 24-layer PCB involves certain processes. Since such a PCB has ten layers of conductive material, its fabrication is complicated. Manufacturers laminate core and prepreg layers under high pressure and high temperature.
During this process, the manufacturer ensures that there is no air between the PCB layers. They also ensure that the adhesive that holds the layer melts properly. A 24-layer PCB consists of a variety of materials. Core and prepreg are SIMilar materials. However, prepregs are more ductile than core materials. This is because it is not fully cured.
When the manufacturer applies high temperatures to the layup, the prepreg melts. The layers are then connected together. After cooling, the result is a solid 24-layer board. Manufacturers apply solder masks to multilayer boards. The role of the solder mask is to prevent short circuits in the traces.
The inner layer of the multilayer board includes a core of fiberglass and epoxy resin. Prepreg laminates these layers together. The manufacturer stacks the inner layers together to ensure the layers are aligned.
Inner layer imaging and etching
inner layer lamination
Outer layer imaging
Plating and etching
Outer layer etch stripping
Advantages of 24-layer PCB
24-layer PCB supports compact design. The PCB has ground and signal layers placed on each other. This board is ideal for SMAll devices like laptops, cell phones, etc. Electronic devices are getting smaller and more complex. 24-layer PCBs are ideal for complex and tiny devices.
Suitable for different temperatures
High current conduction
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