SPH1668LM4H

Overview

The SPH1668LM4H-1 is a miniature, high-performance, low-power bottom-port silicon digital microphone manufactured by Syntiant. It features a single-bit PDM output and operates within a voltage range of 1.62 V to 3.6 V. The device exhibits an omnidirectional response with a sensitivity of -29 dB ±1 dB at 94 dB SPL. Its frequency response spans from 100 Hz to 10 kHz. The component measures 3.5 mm in length, 2.65 mm in width, and 0.98 mm in depth, utilizing SMD/SMT mounting for integration into compact electronic designs.

Feature Summary

• Bottom-port silicon MEMS architecture
• Single-bit PDM digital output
• Omnidirectional acoustic response

Applications

• Edge AI voice processing systems
• Battery-powered consumer electronics
• Audio devices requiring low power consumption

Procurement Notes

Verify the specific suffix (e.g., -1) against official datasheets, as it may indicate packaging or variant differences. Confirm current availability status through authorized distributors, as supply levels can fluctuate. Ensure compatibility with existing PCB footprints and power supply rails before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring a small form factor and digital interface. Verify that the system supports PDM signals and operates within the specified 1.62 V to 3.6 V range. Consider the 100 Hz to 10 kHz bandwidth for audio fidelity requirements. Ensure mechanical clearance accommodates the 3.5 mm x 2.65 mm dimensions.

Part Context

Syntiant acquired Knowles' Consumer MEMS Microphone business in September 2024, integrating these products into its portfolio. The company specializes in edge AI hardware and software solutions, focusing on ultra-low power neural decision processors. This microphone series supports always-on intelligence for audio and sensor applications across various markets.

Replacement Considerations

Check for direct substitutes within the SPH1668 family or compatible bottom-port PDM microphones from other manufacturers. Ensure pinout and electrical specifications match exactly. Verify if alternative parts meet the same size constraints and performance metrics.