STMicroelectronics – Compact MEMS microphone offers excellent acoustic performance


The MP34DT01-M from STMicroelectronics is a compact, omnidirectional digital MEMS microphone which offers excellent performance, including a high Signal-to-Noise Ratio (SNR) and high sensitivity.

The MP34DT01-M has an acoustic overload point of 120dB. Its SNR Is 61dB and sensitivity is -26dB. The total harmonic distortion and noise figure is less than 1% at a sound pressure level of 100dB.

The MP34DT01-M consists of a capacitive sensing element, manufactured using a special silicon micromachining process dedicated to audio sensors, and an interface IC.

This IC is a CMOS device which provides a digital signal in pulse-density modulation format.

The MP34DT01-M is available in a top- port, surface-mount, EMI-shielded package which measures 3mm x 4mm x 1mm. It is guaranteed to operate over an extended temperature range from -40°C to 85°C.


  • Supply-voltage range: 1.64V to 3.6V
  • 0.6mA operating current in normal mode
  • -70dB power-supply rejection ratio
  • 10ms maximum turn-on time


  • Mobile devices
  • Portable media players
  • VoIP handsets
  • Speech-recognition systems
  • E-learning devices
  • Gaming and virtual reality input devices
  • Cameras
  • Anti-theft systems


The STEVAL-MKI155V3 board is a daughterboard to be used with the STEVAL-MKI126Vx Smart Voice kit. It contains four MP34DT01-M digital MEMS microphones.

Orderable Part Number: STEVAL-MKI155V3