Flexible PCB (FPC) is a kind of flexible circuit board with the simplest structure, mainly used for connection with other circuit boards.
The mostly widely used is single layer and double sided FPC.
Single Layer FPC is the simplest type of flexible board. From the bottom to the top: substrate, adhesive, copper foil, adhesive, and protective film. You can add reinforcement as needed.
This kind of fpc is simple structure FPC. Usually made by Raw material and stick band copper clad laminates, those three raw materials are basic production material of fpc .
First the clad laminates need etching then get the circuit we want. The protective film need drill vias then get pads.
Then clean it up with rolling process to combine both together.
Then do the ENIG or HASL surface finishing to protect the pad. In this way fpc board will be made.
Usually need stamping exactly corresponding and form small printed circuit board.some fpc factory didn’t use use protection,this cost will be very low,but the circuit board strength will become bad. Except for the strength need low level,price need low ,better us paste protective film.
Double-sided FPC Board have pads on both sides, which are primarily used for connection to other boards. From the bottom to the top: protective film, adhesive, copper foil, adhesive, substrate, adhesive, copper foil, adhesive, protective film.
When the board circuits are very complex and single board can not reach functions needs,we need choose double fpc or multilayers fpc .The difference bewtween single layer fpc and mutilayer fpc are adding via design series so that connect all layers clad copper.
Usually the first step to make vias. Drilling vias on the base material can clad copper are first step. And the next step is almost same to single layer fpc.
Capacitive Touch Flex PCB
Standard IPC 2
DuPont PI, Domestic Shengyi PI
Min 6mm*6mm, Max 400mm*500mm
0.6mm - 2.0mm
0.5oz - 2.0oz
Min Tracing / Spacing
Solder Mask Sides
As per the file
Solder Mask Color
Green, White, Blue, Black, Red, Yellow
Solder Stop Coating
PI and PET Film
As per the file
White, Black, Yellow
HASL, HASL Leadfree, Immersion Tin, Gold Finger, OSP
Min Annular Ring
Min Hole Diameter
Peelable Solder Mask, Stiffener
Compared with rigid PCB, FPC has many advantages, light, thin, small, more reliable, low cost, they are widely used in many fields, like automotive electronics, communication equipment, laptop, smartphone etc. electronic products.
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