Clarifications of FPC
According to the combination of base material and copper foil,
flexible circuit board can be divided into two types: flexible
board with adhesive and flexible board without adhesive. The price
of non-adhesive flexible PCB is much higher than that of adhesive
flexible PCB, but its flexibility, bonding force between copper
foil and substrate and flatness of solder are also better than that
of adhesive flexible PCB. So it is only used in the high demand
situations, such as the: COF (CHIP ON FLEX, flexible board with
bare chip, the high flatness of the pad) and so on. Because its
price is high, most of the flexible PCBs used in the market are
still adhesive flexible circuit board. Because the flexible circuit
board is mainly used in the situation where bending is required, if
the design or process is not reasonable, it is easy to produce
micro-cracks, welding and other defects.
Economy of using FPC
If the circuit design is relatively simple, the total volume is
small, and the space is suitable, the traditional internal
connection is much cheaper. Flexible circuits are a good design
option if the circuit is complex, processes many signals or has
special electrical or mechanical requirements. When the size and
performance of applications exceed the capacity of rigid circuits,
flexible assembly is the most economical. A 12mil pad with a 5mil
through hole and a flexible circuit with 3mil lines and spacing can
be fabricated on a thin film. Therefore, it is more reliable to
mount the chip directly on the film. There is no flame retardant
that could be an ion source. These films may be protective and
solidified at higher temperatures to obtain higher glass transition
temperatures. Flexible materials are less costly than rigid
materials because they are free of connectors.
FPC Case: Single Layer Flexible FPC With 3M Tape for Keypad
Membrane
(FPC’s are custom-made products, the picture and parameters shown
are just for reference)
General description
This is a type of flexible printed circuit for the application of
keypad membrane. It’s a single layer FPC at 0.1mm thick. The base
laminate is from ITEQ, It’s fabricated per IPC 6012 Class 2 using
supplied Gerber data. Polyimide stiffener is applied on the
inserting head.
Parameter and data sheet
| Size of Flexible PCB | 67.23 X 50.56mm |
| Number of Layers | 1 |
| Board Type | Flexible PCB |
| Board Thickness | 0.10mm |
| Board Material | Polyimide 25µm |
| Board Material Supplier | ITEQ |
| Tg Value of Board Material | 60℃ |
|
| PTH Cu thickness | ≥20 µm |
| Inner Iayer Cu thicknes | N/A |
| Surface Cu thickness | 35 µm |
| |
| Coverlay Colour | Yellow |
| Number of Coverlay | 2 |
| Thickness of Coverlay | 25 µm |
| Stiffener Material | Polyimide stiffner / 3M tape |
| Stiffener Thickness | 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: 0.03µm(Min.); Ni 2-4µm |
| RoHS Required | Yes |
| Famability | 94-V0 |
|
| Thermal Shock Test | Pass, -25℃±125℃, 1000 cycles. |
| Thermal Stress | Pass, 300±5℃,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
Diversified shipping method
Customer complaint rate: <1%
Application
Telephone receiver / earphone FPC, LCD TV soft board, Digital
camera soft board, Tablet PC module soft board
About Us
Bicheng PCB, a unique printed circuit board supplier based in
Shenzhen China serves worldwide customers since it’s born in 2003.
At Bicheng, every batch of PCB goes through electrical test, AOI
inspection, high voltage test, Impedance control test,
micro-section, solder-ability test, thermal stress test,
reliability test, insulation resistance test and ionic
contamination test etc. Finally it is like a beautiful gift to be
delivered to your hands.
Different plant scale to suit for your requirements
16000 square meter factory building
30000 square meter month capability
8000 types of PCB per month
ISO9001, ISO14001, TS16949, UL Certified
Variety of PCB technology to meet the market demands
HDI board
Heavy copper board
Hybrid material board
Blind via board
High frequency board
Metal core board
Immersion gold board
Multilayer board
Backplane board
Gold finger board
Comprehensive sales service presale, in sale and after sale.
Quick CADCAM checking and free PCB quotation
Free-of-charge PCB panelization
Prototype PCB capability
Volume Production capability
Quick turn-around samples
Free-of-charge PCB test
Solid carton packing
