As the most commonly used multi-layer direction, 4-layer circuit boards have many advantages, making them very popular in the industry. Some advantages of using a 4-layer circuit board are:
Using advanced PCB design technology: - Many advanced features, such as impedance control HDI、 The weight difference between the dedicated power supply and grounding layer, as well as the inner and outer copper layers. This makes the 4-layer PCB a versatile choice for various use cases, such as high-speed, high-power, analog signal, mixed signal, and compact design applications.
Balance between cost and complexity: A 4-layer circuit board supports most functions of PCBs with 6 or more layers. Therefore, it can obtain advanced functions at a lower cost than 6-layer PCBs. Due to the reduction in layers, even the cost of HDI and impedance control functions is lower.
Improved design flexibility: Compared to 2-layer PCBs, 2-layer PCBs have more wiring options. Wiring is simpler and more organized, making PCB debugging easier. The introduction of dedicated grounding and power layers provides more space for signal wiring and components, which can be used for denser placement of components or better thermal management.
Enhanced signal integrity: The 4-layer circuit board has higher signal integrity due to its dedicated grounding layer and impedance control support. Many studies and experiments have shown that even if the component orientation is exactly the same as that of a 4-layer PCB, the signal integrity of a 2-layer PCB is better.
Improved thermal management: A simple rule applies to all PCBs, the more copper there is in the PCB, the better the thermal management of the entire PCB. Compared to a 2-layer PCB, adding 2 layers of copper will improve thermal efficiency. The dedicated grounding layer and power layer help to evenly distribute heat throughout the PCB. The 4-layer circuit board can also choose to add copper to the inner layer, so thermal management can also be controlled by increasing or decreasing the weight of copper.
Improving mechanical strength: The four layer PCB contains a large number of pre impregnated materials and copper layers, which can enhance the mechanical integrity of the PCB.
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