SPH9855LM4H-C

Overview

The SPH9855LM4H-C is a digital MEMS microphone from the SiSonic family, manufactured by Syntiant. It features a bottom-port design and delivers a signal-to-noise ratio of 66 dB with an acoustic overload point of 132.5 dB SPL. The sensitivity is specified at -37 +/-1 dBV, with a low-frequency response starting at 25 Hz and power supply rejection ratio of 86 dB. Operating voltage is 1.8 V, supporting low-power mode at 260 µA and standard mode at 1000 µA.

Feature Summary

• Digital output format utilizing PDM interface for direct integration with processors
• High acoustic overload point enabling accurate capture of loud sound sources
• Low-power operational modes to extend battery life in portable devices

Applications

• Voice-activated smart home assistants
• Mobile smartphones and tablets
• Wearable audio recording devices

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status via official documentation before procurement. Ensure storage conditions meet humidity sensitivity requirements to maintain device integrity during assembly processes.

Selection Notes

Select this model when high dynamic range and low noise performance are critical for voice recognition accuracy. Consider the bottom-port configuration for specific acoustic enclosure designs. Evaluate power consumption requirements against available system voltage rails to ensure compatibility with low-power operational modes.

Part Context

This component belongs to the Syntiant SiSonic series of silicon microphones. It represents a digital solution designed for modern embedded systems requiring high-fidelity audio input. The product line emphasizes compact form factors suitable for space-constrained consumer electronics applications.

Replacement Considerations

SPH9855LM4H-1 is a verified substitute within the same series offering identical electrical specifications and pinout compatibility.