Flex PCBs Be Used in Space Applications
In space, electronic equipment has to face extreme pressure and vibration. Hence, the PCBs must be flexible enough to twist and bend while working in such severe conditions. To achieve this, flex PCBs are used in satellite applications. In addition, they also need to withstand orbital collisions. To ensure the reliability of such components, it is necessary to follow specific standards like AS9100D. To do this, a flexible PCB must be manufactured using the right materials. This is why designers prefer to use upgraded Polyimide films. These are more durable than standard ones, and can even withstand humidity and tearing. Additionally, they can be twisted and bent several times without losing their flexibility.
Moreover, a flexible circuit board can be etched with a larger area of copper compared to rigid PCBs. This allows for more complex design and high-density component packing. It also eliminates solder joints, which reduces the number of connections that can break down during operation. This makes a flex PCB much more efficient and long-lasting.
The conductive layers of a flex circuit board are connected to each other through PTH (plate-thru holes) or vias. They can either be single or double-sided. The former has conductive layers on both sides of the substrate while the latter has the same type of layering with the exception that the copper layer on one side is only used to connect to the vias or pads. This enables more conductors to be placed on the surface. This type of flex circuit board is more expensive than the single-sided variety.
Can Flex PCBs Be Used in Space Applications?
A flex pcbs is made with a thin and flexible polyimide film that can be curved and twisted in various ways without losing its structure. It also contains copper layers, which are typically connected to each other through plated-through holes. The copper layers are usually deposited with a gold or silver coating. This is to protect them from corrosion and provide a more stable structure.
Since a flex PCB must endure bending and abrasion, it is important to use the right material for its construction. Manufacturers recommend choosing a flex polyimide such as Kapton that has already been tested in many aerospace applications. Kapton is very lightweight and has good vibration resistance. It also complies with the AS9100D quality standard for aerospace products.
Another important consideration for a flex circuit board is its thickness. To reduce costs, it is best to avoid adding extra layers. For example, you should avoid using pads with the same size as copper layers, which can cause damage to the thin substrate during the planarization process. It is also a good idea to use pad-only plating instead of full-surface plating, which increases etch yields while minimizing copper waste. Finally, it is a good idea to keep the hole-to-copper distance to around 8 mil, as this will prevent stress from shifting the layers during flexing and bending.
To minimize the cost of your flex circuit board, you should consider reducing the number of layers, eliminating the need for selective plating, and keeping the number of surface finishes to a minimum. You should also look into how the components will be positioned on your production panel to maximize material utilization and reduce the amount of waste.