3SM221KMT1GA-P

Overview

The 3SM221KMT1GA-P is a digital MEMS microphone manufactured by 3S (Solid State System). It features a top port design and utilizes Pulse Density Modulation (PDM) for data output. The device operates within a voltage range of 1.6 V to 3.6 V. It provides an omnidirectional acoustic response with a sensitivity of -26 dB ±1 dB at 94 dB SPL. The frequency response spans from 100 Hz to 10 kHz, offering a Signal-to-Noise Ratio (SNR) of 64 dB and an Acoustic Overload Point (AOP) of 120 dB.

Feature Summary

• Digital PDM output interface for direct connection to audio processors
• Omnidirectional sound pickup pattern for consistent audio capture
• Top port acoustic design for flexible PCB mounting orientation

Applications

• Smart speakers and voice assistants
• Portable consumer electronics devices
• IoT audio sensors and smart home hubs

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant and sensitivity rating match the design requirements. Confirm ESD protection handling procedures during assembly, as the component requires standard anti-static precautions. Check RoHS compliance status if required by regional regulations. Ensure the supplier provides original factory-sealed packaging with desiccant protection to maintain humidity sensitivity integrity prior to soldering.

Selection Notes

Select this component when a digital PDM interface is preferred over analog outputs to simplify system architecture. Consider the 1.6 V to 3.6 V operating range for compatibility with low-voltage logic systems. Evaluate the 64 dB SNR and -26 dB sensitivity against ambient noise requirements. The top port configuration allows for specific acoustic chamber designs compared to bottom port alternatives.

Part Context

This part belongs to the 3SM221 series of digital microphones from 3S (Solid State System). The series includes variants such as the 3SM221KMT1KA-P, which shares similar electrical characteristics but may differ in package or port configuration. These components are designed for high-volume consumer applications requiring reliable digital audio input.

Replacement Considerations

The 3SM221KMT1KA-P is a documented alternative within the same product family. Verify pinout compatibility and acoustic port alignment before substitution. Ensure the replacement maintains the required PDM data format and voltage levels.