SPH0644HM4H

Overview

The SPH0644HM4H-1 is a digital MEMS microphone from the SiSonic series, manufactured by Syntiant. It features an omnidirectional acoustic design with a top port configuration and operates on a supply voltage range of 1.6 V to 3.6 V. The device delivers a sensitivity of -36 dB ±1dB @ 94dB SPL and maintains a signal-to-noise ratio of 58 dBA. Its frequency response spans from 50 Hz to 10 kHz, supporting standard PDM digital output interfaces for audio processing applications.

Feature Summary

• Digital PDM output interface for direct integration with host processors
• Omnidirectional acoustic pattern with top-port sound inlet
• Low-power silicon MEMS construction in a compact rectangular package

Applications

• Voice recognition systems requiring low-latency digital audio input
• Smart home devices utilizing always-on wake-word detection
• Portable consumer electronics needing high-fidelity voice capture

Procurement Notes

Verify the complete part number suffix, typically '-1', as the base model may represent a family identifier. Confirm RoHS compliance status and moisture sensitivity level prior to procurement. Check current lifecycle status, as older variants may be marked as obsolete or not recommended for new designs. Ensure compatibility with existing PCB footprints and reflow profiles.

Selection Notes

Select this component when a top-port configuration is required for specific acoustic enclosure designs. Compare the 58 dBA SNR against higher-performance models if noise performance is critical. Verify that the 50 Hz lower frequency cutoff meets application requirements compared to broader-range alternatives. Ensure the PDM interface aligns with the host controller's digital audio capabilities.

Part Context

This component belongs to the SiSonic SPH series of digital microphones, designed for embedded AI and voice processing tasks. It represents a transition from analog MEMS sensors to integrated digital solutions, reducing system complexity. The top-port variant distinguishes it from bottom-port models like the SPH0644LM4H-1, offering different acoustic mounting flexibility.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate the SPH0644LM4H-1 only if bottom-port orientation is acceptable, noting the interface and electrical differences.