TDK introduces world’s lowest power PDM microphone with acoustic activity detect

  • T5838 is a 68dB SNR, 133dB AOP digital MEMS microphone in a standard 3.5 x 2.65 x 0.98 mm package, optimized for smartphones, microphone arrays, smart speakers, headsets and more
  • 130 µA low power mode, 330 µA high quality mode
  • New feature “Acoustic Activity Detect” supports configurable wake-on-sound functionality at power levels as low as 20 µA

TDK introduces the InvenSense T5838, the latest technology breakthrough in the SmartSound™ product family. The T5838 is the world’s lowest power Pulse Density Modulation (PDM), multi-mode MEMS microphone with high AOP and high SNR for smartphones, microphone arrays, smart speakers, IoT and other consumer devices. The microphone offers an exceptionally efficient 130 µA ultra-low power mode to support ‘AlwaysOn’ applications. The T5838 has outstanding low current of 330 µA in ‘High Quality Mode,’ supporting high fidelity audio with 68 dB SNR and 133 dB AOP at 20kHz bandwidth in a 3.5 x 2.65 x 0.98 mm package.

Smartphones and IoT devices continue to drive the requirement for lower-power ‘AlwaysOn’ sensors. To meet these needs, the T5838 adds Acoustic Activity Detect (AAD) capability, in addition to world low power and wide dynamic range, all in an industry-standard footprint.

Acoustic Activity Detect is a new ultra-low power edge processing feature where the microphone monitors the acoustic environment and wakes up the SoC or application processor when activity is detected. It is available with three modes of operation starting at just 20 µA total current draw from the microphone. It provides user programmability to apply various filters and thresholds for optimized performance for each application. It also supports 8kHz bandwidth output for ‘AlwaysOn’ systems requiring audio buffering for cloud processing.

T5838 introduces groundbreaking power levels, acoustic performance and Acoustic Activity Detect in a single PDM microphone,” said Kieran Harney, Managing Director – Audio Products at InvenSense, a TDK company. “With the T5838’s latest technology breakthroughs, complementing our SmartSound portfolio of microphones, TDK continues to lead the industry and bring innovative human-sensing to the market.”

T5838 samples are available now, volume production expected in 1H 2021. TDK will be demonstrating the T5838 platform along with the industry’s most comprehensive portfolio of passive components, sensors, power supplies and batteries during the upcoming CES 2021 conference, being held digitally at For additional information and collateral, please visit or contact InvenSense Sales at