QM-31353-000

Microphones Overview

The Knowles QM-31353-000 is an omnidirectional MEMS silicon microphone designed for analog audio applications. It operates within a voltage range of 0.9V to 1.6V and features a frequency response spanning from 100Hz to 10kHz. The device exhibits a sensitivity of -56.5dB ±3dB at 74dB SPL. Its physical dimensions are 4.00mm x 3.00mm, utilizing solder pads for surface mount assembly.

Microphones Feature Summary

• Omnidirectional acoustic design for uniform sound capture
• MEMS silicon construction for durability
• Analog output signal interface

Microphones Applications

• Voice recognition systems
• Consumer electronics audio input
• Communication devices

Microphones Procurement Notes

Verify component status as the QM-31353-000 is listed as obsolete by major distributors. Confirm availability through secondary market channels or authorized surplus suppliers. Ensure compatibility with existing PCB footprints and soldering profiles before procurement. Check for alternative lead times due to discontinued status.

Microphones Selection Notes

Select this component only if legacy system compatibility requires the specific 0.9V to 1.6V operating range and analog output format. Evaluate the -56.5dB sensitivity against current noise floor requirements. Consider the 100Hz to 10kHz bandwidth limitation for speech-centric applications rather than high-fidelity music reproduction.

Microphones Part Context

This microphone belongs to Knowles' MEMS product portfolio, which integrates silicon micro-machined sensors with ASICs. The company specializes in precision audio components for hearing aids, consumer electronics, and industrial applications. This specific model represents an earlier generation analog MEMS solution.

Microphones Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, direct pin-to-pin replacements may require schematic review and impedance matching verification with newer analog MEMS microphones.