SPH18C3LM4H-1

Overview

The SPH18C3LM4H-1 is a Syntiant SiSonic MEMS microphone featuring an analog output and bottom port configuration. It operates within a supply voltage range of 2.6 V to 3.0 V, drawing current typical for low-power audio sensing applications. The device delivers a Sound Pressure Level (SPL) capability of 132 dB and achieves a Signal-to-Noise Ratio (SNR) of 68.5 dBA. Sensitivity is specified at -38 ± 1 dBV for differential mode and -44 ± 1 dBV for single-ended mode. The frequency response spans from 32 Hz to 20 kHz with an omnidirectional polar pattern. Physical dimensions are 3.5 mm in length, 2.65 mm in width, and 1 mm in depth, housed in an LGA-5 package suitable for surface mount technology.

Feature Summary

• High dynamic range performance with 132 dB SPL handling capacity
• Integrated analog signal processing with bottom acoustic port design
• Omnidirectional sensitivity optimized for consistent audio capture across angles

Applications

• Voice recognition systems requiring high fidelity input
• Smart home devices and IoT audio sensors
• Consumer electronics with compact form factor constraints

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm lot traceability and RoHS compliance status prior to integration. Ensure storage conditions adhere to moisture sensitivity levels defined in the datasheet. Validate electrical parameters against specific batch test reports to guarantee performance consistency in final assembly.

Selection Notes

Select this model when analog interface compatibility is required rather than digital PDM outputs. Consider the 68.5 dBA SNR for noise-sensitive environments. Evaluate the 132 dB SPL limit for high-volume acoustic applications. Ensure power supply rails align with the 2.6 V to 3.0 V operating window. Check mechanical clearance for the 3.5 x 2.65 mm footprint.

Part Context

This component belongs to the Syntiant SiSonic family of silicon microphones. It represents an analog variant within the broader portfolio that also includes digital PDM options like the SPK1638 series. The SPH18C3LM4H-1 utilizes advanced MEMS fabrication techniques to achieve high dynamic range in a small form factor, targeting modern mobile and embedded audio markets.

Replacement Considerations

Direct substitutes include other Syntiant analog bottom-port models such as the SPH18C3HT5H-1 if higher thermal robustness is needed. Cross-brand replacements require careful impedance and sensitivity matching. Verify pinout compatibility and acoustic port alignment when considering alternative manufacturers.