Flex Circuit PCBs Used in Aerospace Applications
A flex circuit is a printed circuit board (PCB) that has a high level of bendability and tensile strength. It can also be molded into complex three-dimensional shapes and can replace traditional ribbon connectors and wiring harnesses in certain applications. It can handle vibrations, shocks and harsh environments better than rigid PCBs. It is used in a variety of different products including heads-up displays for aerospace piloting, wearable technology like smartwatches, and minuscule devices such as modern hearing aids.
A Printed Circuit Board (PCB) is made up of copper and other metals that are etched together to form electrical paths, or traces. These paths are then coated with an insulator called dielectric, which prevents the conductors from touching each other. The dielectric material is usually a polyester or Kapton film. The insulator is then coated with a solder mask to protect it from oxidation, which can occur during the soldering process. The final step is to apply an adhesive, usually epoxy or acrylic, to the conductors and dielectric to bond them together. Some PCBs are built without an adhesive layer, which makes them referred to as adhesiveless flex circuit pcb.
Some factors to consider when designing a flexible circuit are copper thickness and current ratings, which limit the maximum power that can be carried by the traces. Other factors include trace width, flex spacing and etching capabilities. Narrower traces need to be spaced further apart to avoid cracks, while wide traces can be spaced closer together, but this may increase the bending resistance. Another factor is the dynamic bending properties of a flex circuit, which can be improved by using thinner traces and a 2:1 ratio of tracing spacing to flex space.
How Are Flex Circuit PCBs Used in Aerospace Applications?
Rigid flex PCBs are a hybrid of rigid and flexible PCBs that combine the advantages of both. They are characterized by their ability to be shaped and molded into complex three-dimensional structures and by having branches that connect to multiple connectors. These features can reduce the size of the assembly and enable it to fit into tight spaces. They also provide good flexibility and tensile strength, while being resistant to abrasions, heat, and environmental agents.
Another advantage of a rigid flex circuit is that it can eliminate the need for flat cables, which are expensive and bulky. In addition, it can be interfaced with rigid boards to reduce the number of connectors. It can also be designed to be flexible in specific areas, such as a head-up display for an airplane, and can be incorporated into the aircraft’s structure to save space.
PCBWay can also perform an electrical test on your flex circuit to make sure it is free of any faults before it is shipped out to you. This is a quick and inexpensive way to ensure that your product works as expected. You can use a calculator on their website to find out how much it will cost you. They also offer free CAD software to help you with your design.
