Flex PCBs More Sensitive to Damage Than Rigid PCBs
Rigid flex PCBs are often used for circuit boards that need to be resilient to shock, vibration and heat. These circuits are found in a variety of electronic devices including smartphones, tablets, cameras and drones. Rigid flex PCBs are also used for medical devices such as pacemakers and hearing aids.
Vibration is one of the most common causes of damage to a Printed Circuit Board (PCB). The mechanical stress generated from vibration can cause a circuit board to flex or bend repeatedly which can lead to material fatigue, interconnect reliability issues and overall failure of the device. Rigid flex circuits are designed to withstand these challenges by utilizing design and manufacturing processes that allow for better mechanical stability.
In addition to using stronger materials, rigid flex PCBs can be manufactured with thicker layer stacks than standard PCBs. This allows for the addition of components such as connectors and relays, thereby increasing the component density. This can be particularly important in miniaturized devices where space is at a premium and more complex designs are needed.
Another feature of rigid flex PCBs is that they can be produced with either a single or double-sided structure. Double-sided circuits have conductor layers on both sides of the circuit board. This is a popular option for rigid flex circuit boards because it allows the use of more components in a smaller space and offers a high level of flexibility to the design.
Are Flex PCBs More Sensitive to Damage Than Rigid PCBs?
While flexible PCBs are more resistant to damage than rigid ones, it’s still important to design them carefully. One of the most important things to consider is the location and placement of vias. When vias are located in areas that will flex or bend, they are more prone to cracking. This can lead to signal integrity problems and electromagnetic interference issues. To reduce the likelihood of this, it’s a good idea to keep vias away from areas that will be bent and to utilize tear drops to make the holes more secure.
It’s also a good idea to minimize the distance between a via and a copper trace on a flex circuit. This will prevent the flexes from forming cracks around the vias when they are subjected to bending or flexing. This will also help to prevent the copper from becoming lifted from the surface of the flex.
A final consideration when designing a flex circuit is the thickness of the conductive layer. A thicker conductive layer will be more durable against bending and can handle greater amounts of mechanical stress. However, it is important to keep in mind that a thicker layer will increase the cost of the flex circuit. It’s a good idea to consult with the manufacturer about the best thickness to choose for your flex circuit. This will be based on the requirements of your specific application and the design specifications. If you are looking to get a quote for a rigid flex circuit, please contact us. Our experienced team will be able to provide you with the help and support you need.