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Flat FLEX cables, also known as ribbon jumpers, are a type of flexible interconnect cable that provides interconnection between multiple circuit board layers without the need for a dedicated bus. These cables are constructed using a thin flexible substrate, commonly known as a flat flexible substrate, that is coated with a flexible polymer. This coils around the stack of layers and creates a connection that is secure and reliable.

Flat FLEX cables are commonly used in applications that require the high-speed transfer of data, as the flat flexible substrate offers improved electrical connections over traditional bus connections. Additionally, the use of a flexible substrate means that these cables can have different lengths, shapes, and sizes to fit a wide range of applications. Flat FLEX cables are also often used in portable devices, as they are more resilient in the face of shock or vibration.

The working principle of a FLEX cable is relatively simple. The cable consists of a thin flat flexible substrate, which is covered with a flexible polymeric material. When voltage is applied to one end of the substrate, it causes the substrate to coil around the stack of layers, creating a secure connection that will not move around or come loose.

The flat flexible substrate is insulated from the stack of layers, which means that the coil of the substrate does not need to make physical contact with the layer it is attached to. This is important as it allows the cables to be used in applications that require extreme levels of accuracy and precision, such as medical imaging or aerospace applications.

Flat FLEX cables are an extremely versatile interconnect cable, and come in a variety of sizes, shapes, and lengths. As these cables are typically lightweight and have the ability to be bent and flexed, they can be used to reduce space and weight requirements in a variety of applications. Additionally, this technology is generally more affordable than traditional bus connections, and requires less maintenance.