INMP803: Low-Power Omnidirectional MEMS Microphone for Hearing Aids


InvenSense MEMS Microphone

The INMP803 is a high performance MEMS microphone with a unique combination of very low self-noise, tiny package volume (7.3 mm³), and low power consumption. Running from a 1 V supply, the INMP803 consumes only 17 µA of current while providing an equivalent input noise of 27 dBA SPL with an analog 4.5 kΩ impedance output. These features, combined with the benefits of MEMS technology, reflow solder compatibility, and a highly stable response over time and temperature, make the INMP803 an ideal microphone choice for assistive listening devices (ALDs) such as hearing aids.

The INMP803 is identical in performance to the INMP801 but differs from the INMP801 in the organization of the solder pads. The INMP803, in addition to the sound port solder pad ring that is seen on the INMP801, has three solder pads at the back-underside of the package (VDD, Out, Gnd) to facilitate either reflow or hand soldering operations.

† – 7” Tape and reel to be discontinued. Contact for availability.

INMP803 Functional Block Diagram

INMP803 Functional Block Diagram


  • Hearing aids
  • Hearing aid accessories
  • Assistive listening/alerting and signaling systems
  • Audiometers
  • Bone conduction devices
  • Hearing protection

Features and Benefits

  • Small surface-mount package: 3.35 mm × 2.5 mm × 0.98 mm
  • Equivalent input noise: 27 dBA SPL
  • Sensitivity: −35 dBV
  • Hearing aid-compatible voltage range: 0.9 V to 1.3 V
  • Low current consumption: 17 µA
  • 0.8 sec startup to within 0.2 dB of 1 kHz sensitivity
  • Flat frequency response
  • Good sensitivity and frequency response matching
  • Single-ended analog output
  • Compatible with Sn/Pb and Pb-free solder processes
  • RoHS/WEEE compliant


Part # Output Port Location SNR Equivalent
Input Noise
Frequency Response
Maximum SPL Sensitivity @1kHz Sensitivity Tol Package Size Documentation Flex Board Evaluation Board Device
UNITS: (dBA) (dBA) (min - max) +/- dB mm (.pdf) (add to cart) (add to cart) (add to cart)

Analog Bottom 65dB 29dB 80Hz - 16kHz 110dB SPL -35 dBV 3dB 3.35x2.5x0.98 Datasheet

  • Disclaimer

    • InvenSense sensors should not be used or sold in the development, storing, production and utilization of any conventional or mass-destructive weapons or any other weapons or life-threatening applications as well as in any other life-critical applications including but not limited to medical equipment, transportation, aerospace and nuclear instruments, undersea equipment, power plant equipment, disaster prevention and crime prevention equipment. In devices or systems whereby malfunction of these products can be expected to result in personal injury and casualties, InvenSense customers using or selling these products do so at their own risk and agree to keep InvenSense harmless from any consequences. InvenSense reserves the right to make changes to this product, including its circuits and software, in order to improve its design and/or performance, without prior notice.

      InvenSense makes no warranty, either expressed or implied with respect to any product, and specifically disclaims all other warranties, including warranties for merchantability, non-infringement, and fitness for any particular purpose. For more information go to Terms and Conditions.

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