Dual Layer Flexible PCB Built on Polyimide With Immersion Gold and PI Stiffener
(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 (FPC) for the application of Wi Fi Antenna. It’s a 2 layer flex board at 0.15mm thick. It contains yellow coverlay (solder mask) and without silkscreen on entire board, and immersion gold is applied on pads. Polyimide as stiffener is applied on the connector part. The base laminate is from Shengyi and they're fabricated per IPC 6012 Class 2 using supplied Gerber data. Each 200 pieces are packed for shipment.
Parameter and data sheet
| Number of Layers | 2 |
| Outline Dimension | 21.15 x 58.93mm = 1PCS |
| Board Type | Flexible Circuit |
| Board Thickness | 0.15mm +/-10% |
| Board Material | Polyimide (PI) 50 um |
| Board Material Supplier | ITEQ |
| Tg Value of Board Material | 60℃ |
| |
| PTH Cu thickness | ≥20 um |
| Inner Iayer Cu thicknes | N/A |
| Surface Cu thickness | 35 um (1oz) |
| |
| Coverlay Colour | Yellow |
| Number of Coverlay | 2 |
| Thickness of Coverlay | 25 um |
| Stiffener | 200 um |
| |
| Type of Silkscreen Ink | IJR-4000 MW300 |
| Supplier of Silkscreen | TAIYO |
| Color of Silkscreen | White |
| Number of Silkscreen | 1 |
| |
| Mininum Trace (mil) | 4 mil |
| Minimum Gap(mil) | 4 mil |
| |
| Surface Finish | Immersion Gold |
| 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;
8000 types of PCB per month;
Quick CADCAM checking and free PCB quotation;
No minimum order quantity. 1 piece is available;
Volume Production capability;
On-time service;
More than 18 years of experience;
Applications
Keypad FPC; Toy lamp strip; Display backlight; Flex keyboard for mobile phone keys; POS antenna soft board; LCD TV soft board; Digital camera soft board.
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.
