CMM-2718AT-42308-TR

Overview

The CMM-2718AT-42308-TR is an omnidirectional analog MEMS microphone manufactured by Same Sky. It features a rectangular surface-mount package measuring 2.75 mm in length, 1.85 mm in width, and 0.95 mm in height. The device operates within a voltage range of 1.6 V to 3.6 V with a nominal supply voltage of 2 V. Key electrical specifications include a sensitivity of -42 dB ±3 dB at 94 dB SPL, a signal-to-noise ratio of 60 dBA, and a power supply current of 80 µA. The frequency response spans from 100 Hz to 10 kHz, and the acoustic impedance is 300 Ohms.

Feature Summary

• Omnidirectional acoustic porting for uniform sound capture from all directions
• Analog output interface suitable for direct connection to audio processing circuits
• Low power consumption design optimized for battery-operated portable devices
• Robust construction capable of withstanding high sound pressure levels up to 130 dB

Applications

• Voice recognition systems requiring precise audio input
• Portable consumer electronics such as smartphones and tablets
• Hands-free communication modules in mobile devices
• Digital voice recorders and dictation equipment

Procurement Notes

Verify the specific suffix codes against official manufacturer documentation to ensure correct sensitivity and port configuration. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration into the manufacturing process. Ensure that the selected variant matches the intended acoustic performance metrics for the target application environment.

Selection Notes

Select this component when a compact form factor and low current draw are critical constraints. The analog output requires appropriate biasing circuitry compared to digital alternatives. Evaluate the 60 dBA SNR against ambient noise conditions to determine suitability for noisy environments. Consider the top-port orientation for optimal acoustic coupling in tight enclosures.

Part Context

This part belongs to the Same Sky CMM series of MEMS microphones, which offers various sensitivity and package size options. The CMM-2718 family provides standardized dimensions for easy replacement in existing designs. Development kits like DEVKIT-MEMS-004 are available to assist in evaluating the acoustic performance of these components during the design phase.

Replacement Considerations

Direct replacements within the same series include variants with different sensitivities or port orientations, such as CMM-2718AB-38308-TR. Verify pin compatibility and acoustic center alignment when substituting parts to maintain system performance.