31 August 2026Electronics Technology
Manufacturing / Production Technology, Hardware & Services
Würth Elektronik expands its EMC product portfolio with nanocrystalline WE-FNCS sheets. The extremely flexible and thin nanocrystalline layers, protected by a PET cover layer, are supplied in the form of adhesive tapes and strips. They attenuate electromagnetic interference signals in the frequency range from around 10 Hz to 120 MHz. The sheets can be used as a simple, cost-effective way to make housings for electronic devices EMC compliant without the need for mu-metal.Both emissions and external interference are challenges for developers during EMC testing, when demonstrating compliance with standards such as CISPR 32, especially in the lower frequency range.
Components such as power transformers, common-mode chokes (CMCs), DC/DC converters, inverters, switched-mode power supplies, Hall effect sensors, as well as medical systems including MRI scanners, can generate unwanted magnetic fields or be affected by them.
WE-FNCS nanocrystalline sheets offer an effective and easy-to-use solution for suppressing electromagnetic interference (EMI) in such applications. They can also increase the efficiency of wireless power transfer systems by guiding the magnetic flux and reducing stray fields.
Performance of nanocrystalline sheets.
WE‑FNCS is a high-performance magnetic absorber specifically developed to suppress low-frequency EMI. Its nanocrystalline structure ensures exceptionally high magnetic permeability and flux saturation, ensuring uniform attenuation across the entire low- and mid-frequency range. By adapting the number of internal nanocrystalline layers, the absorption performance can be scaled to meet the requirements of different applications. Multi-layer configurations with tailored permeabilities help optimise the shielding effectiveness of a solution, while keeping it thin, flexible and easy to integrate. This is particularly beneficial in applications where space is limited.
A black PET cover layer provides the necessary electrical insulation on the upper side, while an acrylic adhesive layer on the underside simplifies mounting the sheet in production or in finished devices. Both the upper and lower layers are protected by foil, which is removed when the absorber is applied.
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