November 13, 2012

Acoustic components: MEMS microphone with high signal-to-noise ratio

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TDK Corporation presents the new EPCOS C914 MEMS microphone. It offers a particularly high signal-to-noise ratio (SNR) of 65 dB(A) in the frequency range from 20 Hz to 20 kHz. It is thus particularly suitable for demanding audio applications in smartphones. Its high SNR improves the audio quality considerably when the signal source is distant from the microphone, such as in video recordings or hands-free talking.

Thanks to the innovative design of the C914, the distortion is no more than one percent even at a sound volume of 128 dB. In contrast to this, an improvement of the signal-to-noise ratio of conventional microphones as a rule leads to a strong rise of the nonlinear distortion at high acoustic pressures.

Besides its outstanding performance features, the microphone has a footprint of only 3.35 x 2.5 mm² and an insertion height of 1 mm. At a supply voltage of between 1.64 and 3.6 V DC, its current consumption is only 300 µA. The output impedance of this RoHS-compatible component is 200 Ω.

Main applications

  • Smartphones and consumer electronics devices

Main features and benefits

  • Signal-to-noise ratio of 65 dB(A)
  • Low distortion even at sound volumes of 128 dB
  • Compact footprint of 3.35 x 2.5 mm² and an insertion height of 1 mm

About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2012, TDK posted total sales of USD 9.9 billion and employed about 79,000 people worldwide.

About TDK-EPC Corporation

TDK-EPC Corporation, a TDK group company, is the manufacturer of TDK’s electronic components, modules and systems and is headquartered in Tokyo, Japan. TDK-EPC was founded on October 1, 2009, from the combination of the electronic components business of TDK and the EPCOS Group. The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.

For further information on this product contact EPCOS Sales at

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