Murata smallest RF noise filter for audio lines in portable devices

Murata announces smallest RF noise filter for audio lines in portable devices


Murata Manufacturing Co., Ltd. has introduced the NFZ03SG_SN series of audio line noise filters at a size of 0201 inch size (0.6×0.3mm), which is the smallest size in the industry. Mass production of these products began in January 2018.

In recent years, high sound quality has been emphasized as one of the selling points of smart phones and portable audio devices, and audio quality level has been a significant feature by which consumers choose devices. In order to counteract noise, the audio circuits used in these devices must include a noise suppression filter. However, noise suppression filters produce audio distortion, and thus cause a loss in sound quality.
NFZ03SG_SN series make use of our proprietary material technology to suppress audio distortion that occurs when audio circuits are used, in order to efficiently eliminate noise while maintaining high sound quality.

Benefits NFZ03SG_SN series

  • Reduces board space
  • Provides effective noise suppression while maintaining audio quality
  • Gives a design flexibility for target communication frequency
  • Provides effective noise suppression at communication devices such as smartphone


  • 0603: the smallest size audio line noise filters in the industry
  • Provides low distortion characteristics by using special ferrite material
  • Wide variation of impedance from 330 to 1600 ohm at 900MHz
  • Designed to have an impedance peak at communication frequencies


  • Audio lines in portable devices such as smartphones and tablets


  • 330 to 1600 ohm at 900 MHz
  • Designed to have an impedance peak at communication frequencies
  • 0.6 x 0.3 mm size

Audio distortion characteristics (THD+N)

Murata in Brief

Murata Manufacturing Co., Ltd. is a worldwide leader in the design, manufacture and sale of ceramic-based passive electronic components & solutions, communication modules and power supply modules. Murata is committed to the development of advanced electronic materials and leading edge, multi-functional, high-density modules. The company has employees and manufacturing facilities throughout the world. For more information, visit Murata’s website at

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