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TDK announces ultra-high AOP Analog MEMS microphone, ICS-40638

TDK Corporation introduces the InvenSense ICS-40638 MEMS analog microphone. The ICS-40638 microphone offers an ultra-high Acoustic Overload Point (AOP) of 138 dB Sound Pressure Level (SPL), exceptionally efficient 170 µA low power operation and high Signal to Noise Ratio (SNR) of 63 dB in a small 3.5 mm x 2.65 mm x 0.98 mm bottom port surface‐mount package.

TDK announces ultra-high AOP Analog MEMS microphone, ICS-40638

The analog MEMS microphone is equipped with high dynamic range, operates up to 105°C, and is designed for IoT and consumer devices.

The new ICS-40638 microphone is ideal for wearable and IoT applications, particularly in outdoor, industrial or harsh environments, where high temperature and high acoustic overload points present system design challenges. The ICS-40638 includes a MEMS microphone element, an impedance converter, and a differential output amplifier. Other high‐performance specifications include a tight ±1 dB sensitivity tolerance and enhanced immunity to both radiated and conducted RF interference. The part is ideal for noise cancelling applications in challenging environments.

“TDK has a strong presence in the wearable and IoT market segments and our full-line of MEMS microphones makes us the ideal partner to solve our customers’ audio challenges,” said Kieran Harney, Managing Director, Audio Products, InvenSense, a TDK group company. “The ICS-40638 with its ultra-high AOP and high temperature operation enables our partners to design acoustic listening systems that stand up to the loudest and noisiest environmental surroundings.”


  • MEMS: Micro-Electrical Mechanical System
  • AOP: Acoustic Overload Point
  • SPL: Sound Pressure Level
  • SNR: Signal to Noise Ratio
  • IoT: Internet of Things
  • OEM: Original Equipment Manufacturing

Main applications

  • Wearables
  • IoT devices
  • Automotive
  • Still/Video Cameras

Key features

  • 5 mm x 2.65 mm x 0.98 mm package bottom port surface‐mount package
  • 138 dB AOP SBL
  • 63 dB SNR
  • Differential analog output
  • −43 dBV sensitivity (differential)
  • ±1 dB sensitivity tolerance
  • Extended frequency response from 35 Hz to 20 kHz
  • Enhanced RF immunity
  • −81 dB PSRR
  • Compatible with Sn/Pb and Pb‐free solder processes
  • RoHS/WEEE compliant

Key data

  • Product ICS-40638
  • Packaging Dimensions (mm) 3.50 × 2.65 × 0.98
  • SNR dBA 63
  • Acoutsic Overload Point (dB SPL) 138
  • Supply Current (µA) 170
  • Bandwidth (kHz) 20
  • Low Frequency Corner Hz 35
  • Interface Differential Analog

The InvenSense ICS-40638 part and the ICS-40638 evaluation board (EVB) are now available from multiple distributors worldwide.

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