SPH0641LM4H-1

Overview

The SPH0641LM4H-1 is a digital PDM MEMS microphone from the SiSonic series. It features an omnidirectional acoustic port located at the bottom of the package. The device operates within a voltage range of 1.62 V to 3.6 V and draws a supply current of 1 mA. Its frequency response spans from 100 Hz to 80 kHz, with a sensitivity of -26 dB ±1 dB at 94 dB SPL. The signal-to-noise ratio is specified at 64.3 dB. The component measures 3.50 mm in length, 2.65 mm in width, and has a maximum height of 1.10 mm.

Feature Summary

• Digital PDM output interface for direct connection to processors
• Bottom-port acoustic design suitable for constrained enclosures
• Omnidirectional sound pickup capability
• Low power consumption profile

Applications

• Voice recognition systems on Syntiant TinyML development boards
• Machine learning audio data acquisition platforms
• Embedded sensor applications requiring low-power digital audio input

Procurement Notes

Verify the specific suffix (e.g., LM4H vs LU4H) against the official datasheet to ensure correct pinout and acoustic specifications. Confirm the component status as active or obsolete before finalizing designs, as manufacturing availability may vary. Cross-reference the manufacturer part number with distributor listings to avoid ordering errors due to similar model numbers.

Selection Notes

Select this component when a digital PDM interface is required instead of analog I2S or PCM. Ensure the host processor supports the PDM clocking scheme. Verify that the board layout accommodates the bottom-port orientation and the specified package dimensions. Check compatibility with the operating voltage range of the target system logic levels.

Part Context

This microphone belongs to the SiSonic family by Syntiant, designed for ultra-low power machine learning applications. It is commonly integrated into development kits like the Syntiant TinyML Board alongside NDP101 neural decision processors. The component serves as the primary audio input for edge AI voice commands.

Replacement Considerations

SPH0641LU4H-1 is a documented variant within the same product line. Verify package orientation and electrical parameters before substitution.