Bottom Port Analog Microphone

The WM7331 is a low-profile silicon analog microphone offering high Signal-to-Noise Ratio (SNR) and low power consumption. The device incorporates Cirrus Logic’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The compact integration of transducer and internal circuitry on a single die enables implementation with an extremely small package. The WM7331 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts and removing the need for in-line production calibration of part-to-part microphone variations.

Innovation that Rocks® Cirrus RocksTM Cirrus®

Application Categories

Mobile Audio Devices, Wearables, Headsets


  • High SNR (63 dB)
  • Low variation in sensitivity
    • ±1 dB tolerance
  • Low current consumption (55µA)
  • Analog output
  • Bottom Port LGA package
  • 2.5mm x 1.6mm x 0.9mm package size
  • 1.6 to 3.6 V supply

Parametric Specifications

Not Recommended for New Designs
Recommended Replacement: CS7331

Software and Tools

1700-EV1 Setup

Jan 1, 1977, n/a : 21112 Kb

WM7000 Setup

Jan 1, 1977, n/a : 1433 Kb


Comprehensive Solutions