TDK Corporation introduces the InvenSense T3902, the world’s lowest power Pulse Density Modulation (PDM) microphone for mobile, IoT and other consumer devices. The T3902 is an ultra-low power, low noise, multi-mode bottom-port MEMS microphone, enhancing voice-based services which are now commonplace in many devices and homes. The microphone offers an exceptionally efficient 185 µA ultra-low power mode, high SNR of 64.5 dB, and high Acoustic Overload Point (AOP) of 120 dB in a 3.5 mm x 2.65 mmx 0.98 mm package. The microphone’s AlwaysOn functionality in low-power mode enables immediate accessibility upon wake command.

TDK’s new T3902 microphone enables OEM partners to differentiate their product offerings by improving the consumer experience with reduced power consumption. This is especially critical to wearable and IoT designs where reduced board space and battery size are key factors to enabling a small form factor as well as providing a flexible and efficient (low power AlwaysOn) system design.

“The T3902 is the lowest-power PDM microphone on the market today and has been developed to meet the growing demands of the high performance, ultra-low power audio markets,” said Kieran Harney, Managing Director – Audio Products at InvenSense, a TDK Group company. “With this newest microphone product offering, we continue to be committed to bringing to market a strong portfolio of disruptive, high-performance, innovative products that improve end-user experience and empower new and exciting use cases in IoT and mobile devices for our customers and partners.”

Main applications

  • Mobile Devices
  • Wearables
  • Tablets/Displays
  • Ruggedized Computers
  • STD/Smart TVs
  • Remote Controls

Key features

  • 5 × 2.65 × 0.98 mm surface‐mount package
  • Low power: 185 µA in Low‐Power Mode
  • Extended frequency response from 36 Hz to >20 kHz
  • Sleep Mode: 12 µA
  • High power supply rejection (PSR): −97 dB FS
  • Fourth‐order Σ‐Δ modulator
  • Digital pulse density modulation (PDM) output
  • Compatible with Sn/Pb and Pb‐free solder processes
  • RoHS/WEEE compliant

The InvenSense T3902 is available from multiple distributors worldwide. For additional information and collateral, please visit