Brief Introduction of FPC
Flexible Printed Circuit Board (FPC) is referred to as "soft board". In the industry, FPC is a
Printed circuit board made of flexible insulating substrate (mainly polyimide or polyester
Film), which has many advantages that rigid printed circuit boards do not have. for example,
It can be freely bent, wound, folded. the volume of electronic products can be greatly reduced
by using FPC, which is suitable for the development of electronic products in the direction of
High density, miniaturization and high reliability. Therefore, FPC has been widely used in
Aerospace, military, laptop, computer peripherals, PDA, digital camera and other fields or
Products.

FPC also has the advantages of good heat dissipation,
Solderability, easy mounting and low cost.

Flexible printed circuit board has one layer, two layers and multilayer board. the base material
Is polyimide clad laminate. this kind of material has high heat resistance and good dimensional
Stability. It is the final product through pressing with the coating film which has both mechanical
Protection and good electrical insulation. the surface and inner conductors of double-sided and
Multi-layer printed circuit boards are metallized to realize the electrical connection of inner and
Outer layers.

the function of flexible circuit board can be divided into four kinds, namely, lead line, printed
Circuit, connector and multifunction integrated system, which cover computer, computer
Peripheral auxiliary system, consumer household electrical appliance and automobile, etc.



FPC Case: 4 Layer Flexible PCBs Built on Polyimide
with FR4 as Stiffener
(FPC's are custom-made products, the picture and parameters shown are just for reference)


General description
this is a type of flexible circuit for the application of Intercom System. It's a multilayer 4
Layer FPC at 0.25mm thick. the base laminate is using from ITEQ, It's fabricated per IPC
6012 Class 2 using supplied Gerber data. Two types of stiffeners are applied on the back
Side and top side.


Parameter and data sheet

Size of Flexible PCB	71.25 X 80.38
Number of Layers	4
Board Type	Flexible PCB
Board Thickness	0.25mm
Board Material	Polyimide (PI) 25m
Board Material Supplier	ITEQ
Tg Value of Board Material	60
PTH Cu thickness	20 m
Inner Iayer Cu thicknes	35 m (1oz)
Surface Cu thickness	35 m (1oz)
Coverlay Colour	Black
Number of Coverlay	2
Thickness of Coverlay	25 m
Stiffener Material	FR-4 / Stainless steel
Stiffener Thickness	1.0mm / 0.2mm
Type of Silkscreen Ink	IJR-4000 MW300
Supplier of Silkscreen	TAIYO
Color of Silkscreen	White
Number of Silkscreen	1
Peeling test of Coverlay	No peelable
Legend Adhesion	3M 90 No peeling after Min. 3 times test
Surface Finish	Immersion Gold
Thickness of Nickle/Gold	Au: 0.03m(Min.); Ni 2-4m
RoHS Required	Yes
Famability	94-V0
Thermal Shock Test	Pass, -25125, 1000 cycles.
Thermal Stress	Pass, 3005,10 seconds, 3 cycles. No delamination, no Blistering.
Function	100% Pass electrical test
Workmanship	Compliance with IPC-A-600H & IPC-6013C Class 2

Features and benefits
Excellent flexibility
Reducing the volume
Weight reduction
Consistency of assembly
Increased reliability
Controllability of electrical parameter design
the end can be whole soldered
Material optionality
Low cost
Continuity of processing
on-time service
Customer complaint rate: <1% 


Application
General purpose LED soft light strip,Tablet PC capacitive screen soft board


Variety of PCBs


Flying probe test