SPH8855LM4H-1

Overview

The SPH8855LM4H-1 is a digital MEMS microphone from the SiSonic family, manufactured by Syntiant. It features an omnidirectional acoustic port located at the bottom of the package. The device delivers a signal-to-noise ratio (SNR) of 65.5 dBA and supports a maximum sound pressure level (SPL) of 121 dB. Electrical operation is defined by a supply voltage of 1.8 V, with power consumption modes including low power at 260 µA and standard mode at 1000 µA. The output interface utilizes Pulse Density Modulation (PDM).

Feature Summary

• Digital PDM output interface for direct integration with processors.
• Bottom-port acoustic design suitable for compact form factors.
• Dual-mode power management supporting low-power and standard operations.

Applications

• Voice recognition systems requiring high SNR.
• Smart home devices utilizing always-on listening capabilities.
• Wearable electronics with strict power constraints.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and specific lot traceability requirements prior to procurement. Ensure that the ordering suffix matches the required packaging format, as variations may exist between cut tape and reel configurations. Cross-reference the full part number against current datasheets to validate electrical specifications and pinout assignments before finalizing purchase orders.

Selection Notes

Select this component when a balance of high acoustic sensitivity and low power consumption is required for voice-centric applications. The bottom-port configuration facilitates placement in tight spaces where top-access is obstructed. Evaluate the trade-off between the 260 µA low-power mode and the 1000 µA standard mode based on the specific duty cycle and audio fidelity needs of the target system architecture.

Part Context

This model belongs to the SiSonic series of silicon microphones produced by Syntiant. These components are engineered for artificial intelligence and machine learning edge applications. The series emphasizes high signal integrity and energy efficiency to support continuous audio processing in battery-operated consumer electronics and IoT endpoints.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs by comparing pinouts, electrical characteristics, and acoustic performance against alternative models within the same manufacturer's portfolio.