FPC

A: Flexible circuits are ideal for medical devices, implants, sensors, and mobile consumer electronics because they fit where space and/or weight is limited. Flexible circuitry is the preferred and recommended solution for products that require: Wiring solutions that fit where rigid boards cannot.

A: Rigid, flex rigid, and flex PCBs are made with different types of conductive materials. Rigid PCBs, for example, are made from inflexible electro-deposited copper. Flexible PCBs, on the other hand, are often made from bendable annealed copper.

A: Under optimal conditions (controlled temperature and humidity, proper packaging), high-quality polyimide-based Flex PCBs can typically be stored for 2-5 years without significant degradation. However, PCBs with certain surface finishes (like OSP) may have a much shorter shelf life, potentially as short as 3-6 months.

A: The most common application of flexible PCBs is in electronic devices for consumers, in which the shape and size require the circuit to conform to the device's shape while keeping the size as small as possible.

A: The number of layers depends on the design requirements. 12 layers of flex is not unheard of; however, the higher the number of flex layers, the more difficult it is for the PCB to flex. Yes, you can have hashed ground planes on either side of the signal layers.