The INMP621 is a high sound pressure level (SPL), ultra-low noise, low power, digital output, bottom ported omnidirectional MEMS microphone. This microphone clips at 133 dB SPL, which is useful for clearly capturing audio in loud environments. The INMP621 consists of a MEMS microphone element and an impedance converter amplifier followed by a fourth-order Σ-Δ modulator. The digital interface allows the pulse density modulated (PDM) output of two microphones to be time multiplexed on a single data line using a single clock. The INMP621 is pin compatible with the INMP421 and INMP521 microphones, providing an easy upgrade path.

The INMP621 has a high SNR of 65 dBA and sensitivity of −46 dBFS. The INMP621 has an extended wideband frequency response, resulting in natural sound with high intelligibility. Low current consumption, and a sleep mode with less than 5.5 µA of current consumption, enable long battery life for portable applications.

The INMP621 is available in a thin 4 mm × 3 mm × 1 mm surface-mount package. It is reflow solder compatible with no sensitivity degradation.

Product Details

Part # Market Status Output Port Location SNR AOP Sensitivity Package Size LF Cutoff
UNITS: dBA dB SPL dbfs (mm) Hz
Production PDM Bottom 65 133 -46 3 x 4 x 1 45

Documentation & Resources


  • 133 dB SPL Acoustic Overload Point
  • Small and Thin 4 mm × 3 mm × 1 mm Surface-Mount Package
  • Omnidirectional Response
  • Very High SNR: 65 dBA
  • Sensitivity of −46 dBFS
  • Extended Frequency Response from 45 Hz to >20 kHz
  • Low Current Consumption: 1.2 mA
  • Sleep Mode for Extended Battery Life, 5.5 µA Consumption
  • High Power Supply Rejection (PSR): −100 dBFS
  • Fourth-Order Σ-Δ Modulator
  • Digital Pulse Density Modulation (PDM) Output
  • Compatible with Sn/Pb and Pb-Free Solder Processes
  • RoHS/WEEE Compliant

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