Industry News|2022-02-25| admin
Classification of FPC cables
According to product characteristics, there are four types of FPC cables: single-sided FPC cables, double-sided FPC cables, multi-layer flexible FPC cables and rigid-flex FPC cables.
①Single-sided FPC cable is the lowest cost printed board that does not require high electrical performance. When single-sided wiring, a single-sided flexible board should be used. It has a layer of chemically etched conductive patterns, and the conductive pattern layer on the surface of the flexible insulating substrate is rolled copper foil. Insulating substrates can be polyimide, polyethylene terephthalate, aramid and polyvinyl chloride.
②The double-sided FPC cable is a conductive pattern made by etching on both sides of the insulating base film. The metallized hole connects the patterns on both sides of the insulating material to form a conductive path to meet the design and application of flexibility. The masking film protects single and double-sided conductors and indicates where the components are placed.
③Multi-layer flexible FPC cable is to laminate 3 or more layers of single-sided or double-sided flexible circuits together, form metallized holes through drilling and electroplating methods, and form conductive paths between different layers. No complicated welding process is required. Multilayer circuits have huge performance differences in terms of higher reliability, better thermal conductivity, and easier assembly performance. When planning the layout, the interaction of assembly size, number of layers and flexibility should be considered.
④The traditional rigid-flex FPC cable is composed of rigid and flexible substrates selectively laminated together. The structure is tight, and the conductive connection is formed by metallization. If a printed board has components on the front and back, rigid-flex boards are a good choice. But if all the components are on one side, it will be more economical to use a double-sided flexible board and laminate a layer of FR4 reinforced material on the back.
⑤ The flexible FPC cable with hybrid structure is a multi-layer board, and the conductive layer is composed of different metals. An 8-layer board uses FR-4 as the inner dielectric and polyimide as the outer dielectric, with leads extending from three different directions of the motherboard, each made of a different metal. Constantan, copper and gold are used as separate leads. This kind of hybrid structure is mostly used in the connection between electrical signal conversion and heat conversion and in the case of low temperature where the electrical function is relatively strict, and it is a specific and feasible solution.
It can be evaluated by the convenience and total cost of the interconnected design to achieve the best price-performance ratio