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What is Flex PCB? 

The most common and used type of printed circuit board is rigid, but flexible is another type. Flex PCB are also known as Flex Circuit Board or FCB. You might think that PCBS might are two types, rigid or just flexible, while there is another hybrid type called rigid-flexible PCBS. Rigid flex PCB is a kind of composite circuit board with both rigid and flexible circuits.

Flex PCB Use Cases

1. Actually the examples of using flex PCB is unlimited, but showing some could clarify the importance of this technology rather than thinking that it is only good for connectors and screen panels.

2. Regards using flex PCB as connectors, it could be a cost effective approach compared to rigid ones connected with wires. This is because connecting 2 PCBs together may require in some cases designing a special harness cable or connector which will add additional steps in assembly and introduce more cost for testing and assembly.

3. Another case of using flex PCB is when doing a replacement of a part with a different package without changing the PCB design.

Flex PCB offers several advantages

1. Improve heat dissipation

Flexible PCBS provide better airflow and heat dissipation due to the streamlined design of the polymer substrate and printed circuit board.

2. Reliability

Flexible PCBS can be bent up to 500 million times in a design with moving parts and no faults. Because of the thermal stability of polyimides, these flexible PCBS can serve as a better base for surface mount elements.

3. Reduction in packaging

Due to the thickness of the substrate used, rigid printed circuit boards are usually rectangular and bulky. These characteristics of flex PCBS make them an ideal solution for compact and sensitive applications.

4. Dielectric constant

Flex PCBS offer better electrical performance because their low permittivity allows fast transmission of electrical signals and reduces the noise factor. 

5. A single assembly

Flexible circuits reduce assembly costs by replacing multiple individual circuits with a single flexible component. This also saves assembly time and materials. There is no limit to the length of the flexible board, which is why multiple circuits can be assembled in series at once.