TDK introduces noise suppression filters for audio lines of high sound quality devices

     TDK Corporation has introduced the latest MAF1005FR series of small noise suppression filters with dimensions of only 1.0 mm (L) x 0.5 mm (W) x 0.5 mm (H). The series of laminated patch components are designed to improve audio line (sound transmission line) sound quality and reduce noise interference in other devices such as smartphones and tablets, wearables and portable game consoles, and will begin mass production in November 2023.

     The audio lines of smartphones and similar devices emit electromagnetic noise that interferes with the built-in antenna, reducing reception sensitivity. This noise can cause a lot of problems, especially if you need high-quality audio and effective noise suppression. In order to control noise in audio lines, patch magnetic beads are usually used. However, although the patch magnetic beads can effectively reduce noise, they can also cause audio quality distortion, which in turn affects the sound in the audio line.

     The new MAF1005FR series noise suppression filter has an impedance of up to 2,600ω in the 900 MHz band and an insertion loss of more than 25 dB, which effectively improves sound quality and reduces noise interference. This is because the series uses a newly developed low-distortion ferrite material, which maintains the sound quality and solves the problem of sound deterioration caused by the patch magnetic beads.

     These components support broadband bandpass, extending from FM to cellular bands. Unlike traditional products, which require two noise suppression filters for each frequency range, only one MAF1005FR component is required, which also simplifies the noise suppression design and implementation of electronic devices. The compact size of this series of noise suppression filters supports an operating temperature range from -55 °C to +125 °C.

     TDK plans to further expand its product lineup to include smaller components for high-frequency bandpass noise control, with support in the 900 MHz to 5 GHz frequency band range. In addition, TDK will continue to provide products for application scenarios that need to support high currents, such as loudspeakers, to meet market demand.