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We have upgraded our Impedance Calculator, a free 3D field solder, which now uses the 2D numerical solution of Maxwell’s equations for PCB transmission lines. Try Sierra Circuits’ new Impedance Calculator
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To learn more about designing flex boards, download the design guide mentioned below. We will be happy to address your concerns. If you want to know more about controlled impedance for flex PCBs, let us know in the comments section. Sierra Circuits uses Dupont materials for flex PCBs.Ĭontrolled impedance is one of the critical factors in order to minimize the signal reflections in a PCB. Standard adhesive-less polyimide materials fulfill the controlled impedance design requirements while reducing costs at the same time. These materials are more expensive than polyimide materials. However, adhesive-less materials are preferred for high-speed applications due to their consistent results.Īdvanced materials like Teflon and Teflon/Polyimide hybrids are suitable for high-speed applications. Both adhesive-less and adhesive-based materials can be used for the flex CI designs. There are two types of polyimide materials: adhesive-based and adhesive-less materials. This makes them ideal for flex-controlled impedance designs. The thickness of the flex materials remains uniform throughout. These substrates offer a lower Dk value (3 to 3.5) when compared to rigid materials. Flex PCB materials for controlled impedanceįlex boards are generally made of polyimide substrates. However, this configuration significantly increases the flex thickness which in turn decreases the flexing capability. Stripline configuration allows shielding on either side of the traces. The surface microstrip configuration makes way for the thinnest possible flex core offering the highest degree of flexibility. Thicker flex cores increase the overall thickness and reduce bendability. Impedance control in flex designs requires thicker flex cores than standard flex cores to achieve the desired impedance value. The most common configurations used for impedance control in flex boards are: Single-ended microstripģ layer differential stripline arrangement for flex impedance control