SPH0645LM4H-B

Overview

The SPH0645LM4H-B is a digital MEMS microphone manufactured by Syntiant, part of the Crawford series. It features an I2S digital output interface and bottom port configuration. Key electrical parameters include a sensitivity of -26 dBFS, a signal-to-noise ratio (SNR) of 65 dBA, and a frequency range of 1.024 MHz to 4.096 MHz. The device operates on a supply voltage of 1.8 V with a current consumption of 600 uA. It functions within a temperature range of -40°C to +100°C. Physical dimensions are 3.5 mm in length.

Feature Summary

• Integrates a silicon-based MEMS sensor with an integrated ASIC for digital audio conversion.
• Provides a standard I2S digital output interface for direct connection to host processors.
• Utilizes a bottom-port acoustic design to optimize placement flexibility on printed circuit boards.

Applications

• Voice recognition systems requiring low-power digital audio input.
• Smart home devices utilizing bottom-port microphone arrays.
• Industrial equipment monitoring using wide-temperature operation capabilities.

Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm that the specific suffix matches required specifications, as variations may exist. Check current lifecycle status, as this model is listed as obsolete. Ensure compatibility with existing PCB footprints and I2S controller interfaces before finalizing procurement decisions.

Selection Notes

Select this component when an I2S interface is preferred over PDM for system integration. Consider the 65 dBA SNR for applications requiring high-fidelity voice capture. Evaluate the 1.8 V operating voltage against available power rails. The bottom-port design suits enclosures where top-access is restricted. Verify thermal tolerance requirements against the specified -40°C to +100°C range.

Part Context

This component belongs to Syntiant's Crawford series of digital microphones. It represents a transition from analog to fully digital MEMS solutions, integrating signal processing directly onto the package. The product line focuses on low-power, high-performance audio sensing for embedded systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the component is listed as obsolete, alternative sourcing requires verification of pin-compatible or functionally equivalent replacements from current Syntiant portfolios or other manufacturers.