EMC Components: TDK launches ultra-small noise suppression filters for audio lines with high noise attenuation in the 5-GHz band

• The filters achieve industry-leading* noise attenuation in the high-frequency range exceeding 5 GHz
• A newly developed low-distortion ferrite material significantly reduces audio distortion by minimizing performance variations in the audio line of small consumer devices
• Reduces attenuation of audio signals with lower resistance than conventional products, achieving a wide dynamic range

TDK Corporation (TSE:6762) has announced its latest noise suppression filters of the MAF0603GWY series. These measure only 0.6 mm x 0.3 mm x 0.3 mm (L x W x H) for use in small consumer devices like smartphones and wearables. Mass production of the new product series is set to begin in April 2026.

Electromagnetic noise radiated from audio lines in smartphones, wearable devices, and the like interferes with the built-in antenna and can reduce the receiver sensitivity. The common countermeasure is chip beads. While effective at suppressing noise, they have the drawback of degrading the audio quality on the audio line, which users may find annoying.

The new MAF0603GWY series of noise suppression filters resolves this drawback by employing a newly developed, proprietary low-distortion ferrite material. It introduces just minimal change to audio-line characteristics and significantly reduces audio distortion, eliminating the sound-quality degradation that occurs when chip beads are used. It provides industry-leading high attenuation in the 5-GHz band (impedance up to 3220 Ω at 5 GHz), effectively suppressing noise. Compared with conventional products, it also features lower resistance to reduce attenuation of audio signals and realizes a wide dynamic range.

TDK will continue to contribute to the industry by offering a broad lineup of noise suppression filters and technical support that reconcile audio-quality preservation with electromagnetic-noise countermeasures for mobile and wearable devices with communication functions.

* As of April 2026, according to TDK.