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| Question | Answer |
|---|---|
| We have a flex PCB design, which has vias in pad. What can we do to replace them? We do not have space, as it’s a miniature design of a smart ring. Will a flex PCB work for bending like a smart ring? | For a miniature design like a smart ring, via-in-pad is generally the most practical solution because of the extremely limited space. Alternative via placement strategies usually require additional area, which may not be feasible in such a compact layout, especially near BGAs or dense component regions. Regarding bending, a flex PCB can work for a smart ring form factor, but the bend radius must be carefully planned. Flex materials require a larger bend radius compared to rigid boards to avoid copper cracking or layer fatigue. With proper stack-up design and adherence to recommended bend-radius guidelines, the flex can reliably support the curved shape of a smart ring. |
| Regarding the stiffener, do you need to be included in the design, or are you going to do it once the design is sent to you? | We can take care of adding the stiffeners during fabrication, but we need the required details from you in the design package. Please specify whether the stiffener should be on the top, bottom, or both sides, and indicate the type of stiffener you prefer, such as FR-4 or other available materials. Once this information is provided, our team will incorporate the stiffener correctly during production |
| Does stiffener prohibt assembly? | It depends on the stiffener’s position. If the stiffener is placed in an area that interferes with component mounting, it may restrict assembly. Otherwise, it does not pose an issue. |
| What is the smallest width tracks in a designer for flex? | It depends on the copper weight. Thinner copper allows for finer trace widths, while heavier copper requires wider traces. |