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Rigid Flex PCB
Rigid-Flex PCB combines rigid and flexible circuit boards through lamination, offering both mechanical support for components and foldability. It is widely used in foldable phones, aerospace, and medical devices.
Core Value: Why Choose Rigid-Flex PCB?
Choosing a rigid-flex PCB is a design philosophy of systemic optimization. It improves the overall quality of a product across multiple dimensions.
Space & Weight Optimization: Traditional board-to-board connections rely on connectors and cables, which take up space and add weight. Rigid-flex PCBs integrate these into a single component, theoretically reducing volume by up to 40% and weight by over 30%, offering immense freedom for industrial design.
Reliability Improvement: Connectors and solder joints are weak points in a circuit, prone to failure under vibration, shock, or temperature changes. Rigid-flex PCBs drastically reduce these potential failure points, significantly enhancing connection reliability.
Rethinking Cost-Effectiveness: Many believe rigid-flex PCBs are expensive. While the unit price is typically 3 to 8 times that of a standard rigid board, whether it is cost-effective requires a holistic view:
Total Cost of Ownership: After factoring in the savings from eliminating connectors, cables, and their associated assembly, testing, and repair costs, the overall system cost may be lower or comparable.
Reliability Dividend: For mission-critical fields like medical devices and aerospace, where failure is not an option, the value of increased reliability far outweighs the material cost.
Key Technical Parameters & Design Guidelines
Designing and manufacturing rigid-flex PCBs is far more complex than standard boards. The following are key guidelines:
Bend Radius (Most Critical): This is the most important design constraint to consider first.
Static Bending: The board is bent only during installation and not again. The recommended minimum bend radius is 10 times the board thickness.
Dynamic Bending: The board is repeatedly bent during product use (e.g., foldable screens). The minimum bend radius must be at least 20 times the board thickness. Any bend radius less than 10 times the thickness dramatically increases the risk of trace fracture.
Transition Zone Protection: The junction between the rigid and flexible areas is the most stress-concentrated point and is prone to breakage. During design, all vias and pads must be placed at least 1mm-2mm away from this junction, and the edge of the rigid board at the junction should be designed as a smooth curve, avoiding sharp right angles.
Material Selection: In areas requiring repeated bending, Rolled Annealed (RA) Copper must be used. RA copper offers better ductility and fatigue resistance, whereas standard Electro-Deposited (ED) copper can crack after only a few bends.
Circuit Layout: When routing traces in the bend area, use curved lines and avoid sharp 90-degree turns. Signal traces should ideally run perpendicular or parallel to the bend’s axis to help distribute stress.
Application Scenario Comparison: Rigid-Flex PCB vs. Flex + Connectors
This comparison helps you accurately determine if your product truly needs a rigid-flex solution.
| Comparison Dimension | Option 1: Multiple Rigid Boards + FPC Cable/Connectors | Option 2: Rigid-Flex PCB |
|---|---|---|
| Reliability | Moderate. Risks include poor contact, oxidation, and loosening due to vibration at the interface. | Highest. The integrated structure eliminates physical points of failure at the interface. |
| Space Utilization | Limited. Connectors themselves take up volume and require clearance for mating/unmating. | Maximized. Allows for 3D folding tightly against the inner surface of the enclosure, offering extreme compactness. |
| Assembly Cost | Higher. Requires manual or automated operations for inserting and latching cables. | Lower. The entire board is placed and soldered like a single component, enabling high automation. |
| Repairability | Better. A faulty module or cable can be replaced individually. | Poorer. Damage to any section often requires replacing the entire assembly. |
| Best Suited For | Modular designs, products with frequent design revisions, cost-sensitive projects, and applications with relatively ample space. | Products with extreme space constraints, high vibration, pursuit of ultra-thin/light designs, mass production, and high-reliability requirements. |
Need Rigid-Flex PCBs ?
With regard to flex and rigid-flex products, we offer a wide range of cost-effective solutions and capabilities, from single and double-sided circuitry to multilayer designs up to 20 layers in technology. We will work with you to select the best functional configuration, as well as the right connectors and components, to ensure that all of your application requirements are met.
Rigid Flex PCB Manufacturing Capabilities
| No. | Item | Process Capability Parameter |
| 1 | PCB Type | Rigid-flex PCB |
| 2 | Quality Grade | Standard IPC 2 |
| 3 | Layer Count | 2 layers, 3 layers, 4 layers, 6 layers, 8 layers |
| 4 | Material | Polyimide Flex+FR4 |
| 5 | Board Thickness | 0.4~3.2mm |
| 6 | Min Tracing/Spacing | ≥4mil |
| 7 | Min. Hole Size | ≥0.15mm |
| 10 | Surface Finish | Immersion Gold (ENIG), OSP, Immersion Silver |
| 11 | Special Specification | Half-cut/Castellated Holes, Impendence Control, Layer Stackup |