Flexible PCB
What is Flexible PCB?
Flexible printed circuit boards, also called Flexible PCBs or Flex PCBs, derive their name for their ability to enable the circuitry to be designed to fit the electronic device or product, as opposed to building the device to conform to the circuit board. Flex boards are characterized by a distinctly patterned printed circuitry and component arrangement highlighted by a malleable base material.
What are Advantages of Flexible PCB?
Flexible printed circuit boards offer a number of potential benefits including:
Saving Space. Flex PCB design requires only about 10 percent of the space and weight of an ordinary circuit board assembly, offering greater installation and packaging freedom. The inherent flexibility also permits tighter bend capabilities.
Maximum Reliability. A flexible printed circuit board requires fewer interconnects, which in turn requires fewer contact crimps, connectors and solder joints. Simply put, a flexible PCB board does not contain as many potential sources for failure, which enhances their reliability.
Enhanced Capabilities. The flexible printed circuits boards are compatible with virtually any type of connector or component and works well with options such as ZIP connectors. They also perform extremely well in extreme temperatures and offer superior resistance to radiation and chemicals.
Cost Savings. Cost-saving advantages of Flexible PCBs include reduced material and packaging demands, lower parts replacement costs and assembly errors that could result in the need for repairs.
Thsse benefits make flex PCBs ideally fit for a wide range of applications in industries such as Military, Transportation, Medical, Consumer Electronics, Automotive, Aerospace, Communications and Industrial.
General specification for Flex/Flex-rigid PCB
| Feature | Capability | |
|---|---|---|
| Base material | PI 、FR4、 PET Cu | |
| Flexible Insulator | PI : 1/2mil(12.5um)to 5mil (127um) | |
| Pet: 1/2mil(12.5um)to 5mil (127um) | ||
| Conductor | (Copper) | |
| Rolled Annealed (RA) | ||
| Electrodeposited (ED)) | ||
| Thickness: 1/3oz(12um) to 6 oz(200um) | ||
| Adhesive | Acrylic Adhesive: 1/2mil(12.5um) to 3mil (760um) | |
| Adhesiveness Materials | ||
| Solder Mask | PI / PET | Covered in layers PI and PET film |
| Resist Oil | Solder Mask resist oil ) | |
| Thickness:12-18um | ||
| Color(Green,Black,Yellow,White) | ||
| Stiffener | PI PET thickness:0.075-0.3mm | |
| FR4(thickness): 0.2-3mm | ||
| Steel thicknes: 0.075-0.5mm | ||
| Rigid - Flexible | PI+FR4 (thickeness): 3 to 125mil | |
| Surface Finish | Tin | Immersion Tin |
| Gold | Immersion Gold tickness: 0.025-0.05um | |
| Electrolytic Hard Gold thickness:>0.05um | ||
| Silver | Immersion Silver | |
| OSP | Organic Solerability Preservative | |
| Shielding | Black Electromagnetic Film, Required to limit Electromagnetic and/or Electrostatic | |
| Impedance | Impedance tolerance:+/-10% | |
| Layers | 1to 8 layers(Flexbile,Rigid-Flexible) | |
| Product Size | Max. Size:1420*400mm | |
| Min. Size:2.5*2.5mm | ||
| Outline tolerance | Hand Tirm tolerance:+/-0.2mm | |
| Cutter Dies tolerane:+/-0.2mm | ||
| Punch Dies tolerance:+/-0.075mm | ||
| Laser Cut tolerance:+/-0.05mm | ||
| Min. hole dimension | Drilling(P.T.H) | Machine Drilling: ￠0.15mm |
| Laser Drilling: ￠0.05mm | ||
| Punching | ￠0.50mm | |
| Tolerance of PTH | ±0.05mm | |
| Conductor | Min. Width | (Min. width): 1.5mil Tolerance:+/-15% |
| Min. Spacing | (Min. Spacing): 1.5mil Tolerance:+/-15% | |
| Pad | Min. Pad: 0.25mm | |
| Stiffener Holes | Min. stiffener Holes: 0.2mm | |
| Peeling strength | 1.0KGf/CM 0.5KGf/CM | |