Otherwise, the above stackup is very versatile, and it is used in everything from simple digital boards to computer motherboards and fast DDR memory sticks. The above arrangement may have slightly different thicknesses, but this is only critical when working with impedance-controlled traces and routing. Most fabricators will use this configuration as their standard 4 layer PCB stack.Īlternative 4 layer PCB stackups will use a prepreg sheet on the central layer and two core laminates on the outer layers, sometimes all with the same thickness.
Finally, through-hole vias are normally used to provide connections between layers. In addition, the outer layers will be covered in solder mask with exposed pads to provide a spot to mount SMD and through-hole components. The two inner layers are often used for power and ground nets, while the surface layers are used primarily for signals and for mounting components.
This stackup uses a thick core layer in the center of the board covered with two thinner prepreg layers. The image below shows a standard 4 layer stackup used by most fabricators. With the right design tools, 4 layer PCB tutorial, and guidance from your PCB fabricator, it’s easy to design a 4 layer PCB stackup. Defining a 4 Layer PCB Stackup for Your Printed Circuit Boardīecause 4 layer PCB stackups are so common in many products, designers should have an idea of how to use and design a 4 layer stackup.
Altium Designer provides the essential tools needed to create a 4 layer PCB stackup in standard rigid boards, rigid-flex boards, and multilayer board assemblies. Instead of guessing at the right layer count, dielectric constant, and loss tangent to define in your PCB, use the best PCB design tools in Altium Designer to implement your fabricator requirements. This layer stackup PCB is rather simple and can be reliably fabricated as long as the basic layer thickness and layer arrangement requirements are met. Every PCB stackup needs to be built to consider fabrication capabilities, available materials, and target impedance, and it’s your fabricator’s job to provide the PCB stackup specification for your layer count.Ī 4 layer PCB stackup is the most common multilayer PCB stackup used in modern electronics. However, you would be surprised at the number of PCB stackups that need to be modified before beginning full-scale production. Whenever you start a PCB design project, it’s likely that your last instinct is to contact your fabricator about their stackup requirements. A PCB design software package with stackup design features for professional PCB layout engineers.
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