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What is fr4 board

As the basic material of PCB, fr4 board is popular among electrical engineers and designers. The low cost, multi-function and rich beneficial physical properties of this material make it popular. FR4 sheet is an electrical insulator with high dielectric strength. They also have a high strength to weight ratio and are lightweight and resistant to moisture. When added to their relative temperature resistance, FR4 performs well under most environmental conditions.

fr4 board
fr4 board

FR4 board connection

These qualities make FR4 an ideal default substrate for high quality PCB manufacturing processes. If these attributes are used correctly, they can also form the basis for high-quality and low-cost PCBs.

In PCB, FR4 forms the main insulation backbone. This is the basis for manufacturing companies to build circuits. Once ready, the FR4 plate will be laminated with one or more layers of copper foil by heating and adhesive. This copper forms the circuit in the finished product and may cover one or both sides of the board, depending on the design of the board.

Complex PCB may use more than one side of the circuit board, or even use multilayer circuit boards to produce more complex circuits. From here, before covering with solder mask, the circuit is extracted and etched to prepare for the final screen printing layer and subsequent welding process.

FR4 board and high frequency laminate

So, using all the information listed above, how do electrical engineers or PCB designers choose between FR4 and high frequency laminates? First, the designer must list and compare the electrical and mechanical requirements of the final PCB using the most specific parameters. The designer must then examine how FR4 will meet these parameters compared to the laminate designed to process high frequency signals. More accurate data for each of these points can be easily obtained using the industry data table.

In short, FR4 is a widely related material, which is popular mainly for its low cost and relative mechanical and electrical stability. Although this material has a wide range of advantages and can be offered in a variety of thicknesses and sizes, it is not the best choice for every application, especially high-frequency applications such as RF and microwave design. In the latter case, high frequency laminates are a better choice. However, it is easy to see why FR4 is still so widely used today.



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