Best Technology is one of the best pcb manufacturers and printed circuit board suppliers in China
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Best Technology is one of the best pcb manufacturers and printed circuit board suppliers in China
A single-sided flexible printed circuit (1-layer flex circuit) is a custom flexible pcb with one layer of copper trace on one substrate, and with one layer of Polyimide overlay laminated to copper trace so that only one side of copper will be exposed, so that only allowing access to copper trace from one side, comparing to dual access flex circuit which allows access from both top and bottom side of the flex circuit. As there’s only one layer of copper trace, it is also named as 1 layer flexible printed circuit, 1-layer flexible circuit, or even 1-layer FPC, or 1L FPC.
Double-sided custom flex circuits consist of double-sided copper conductors and can be connected from both sides. It allows more complicated circuit designs, and more components assembled. The major material used is copper foil, polyimide and overlay. Adhesiveness stack-up is popular for better dimensional stability, high temperature, and thinner thickness.
Dual access flexible circuit board refer to the flex circuit which can be accessed from both the top and bottom side but only has only layer of conductor trace. Copper thickness 1OZ and overlay 1mil, it is similar with 1 layer FPC and opposite side FFC. There’re overlay openings on both sides of the flex circuit so that there’s solderable PAD on both top and bottom sides, which is similar to double-sided FPC, but dual access flex circuit board has a different stack up because of only one copper trace, so no plating process is needed to make plated through hole (PTH) to connect between the top and bottom side, and trace layout is much more simple.
The multi-layer custom flex circuits flex circuit refers to a flex circuit with more than 2 layer circuit layers. Three or more flexible conductive layers with flexible insulating layers between each one, which is interconnected by way of the metallized hole through the vias/holes and plating to form a conductive path between the different layers, and external are polyimide insulating layers.
