High-Performance Analog MEMS Microphone – Compact & Low Power

application scenarios for bluetooth headsets

application scenarios for recording devices

The ECM-M3722-4256M is a low-power analog MEMS microphone for space-constrained designs. With -42dB sensitivity, 56dB SNR, and superior RF immunity, it delivers crisp voice pickup in TWS earbuds, smart home devices, and IoT applications—all in a compact 3.76mm package.

🚫 Factory direct sales only – no retail.
Minimum order quantities (MOQs) apply.
Suitable for brand owners and manufacturers only.
📞 Please contact us to discuss your project and order details.

🧪 Sample

Free sample – shipping extra

🧭 Trial Order

From 500 pcs (1st order only)

📦 MOQ

3,000 pcs (mixed models allowed)

Model: ECM-M3722-4256M
Dimensions: 3.76 × 2.24 × 1.1 mm
Directivity: Omnidirectional
Sensitivity: -42dB±3
Impedance: 300Ω
S/N Ratio: 56dB
Max SPL: 115dB
Operating Voltage: 2.1Vdc
Frequency Response: 100Hz~10KHz

Tags: Equipment Mics

Technical Specifications

The ECM-M3722-4256M features a sensitivity of -42±3dB, ensuring clear audio capture even in low-volume environments. Its compact size of 3.76mm x 2.24mm x 1.10mm makes it perfect for devices with limited space, while its low power consumption (1.6V to 3.6V) is ideal for battery-powered applications. The microphone also offers excellent RF immunity, reducing interference in high-electromagnetic environments, and operates reliably across a wide temperature range of -40℃ to +85℃.

Application Scenarios

Bluetooth Headsets: High sensitivity and low power consumption make it ideal for clear voice calls in Bluetooth headsets.
Smart Home Devices: Suitable for smart speakers, doorbells, and other devices requiring clear audio in noisy environments.
Portable Recording Devices: Its small size and low power consumption make it perfect for portable recorders and similar devices.

Recommended Interface Circuit

Standard Test Circuit

Frequency Response Curve

Typical Frequency Response

Dimensions (UNIT: mm)

Appearance Dimension

Packaging Overview

Use ESD-safe reel and carrier tape for packing.
Quantity per reel: 5,000 pcs.
Each reel is sealed in a moisture-proof, anti-static bag.
Strict anti-static procedures are followed during the packing process.
Label includes model number, quantity, lot number, and manufacturing date.

Reliability Tests

Thermal Shock: 100 cycles of air-air thermal shock from -40℃ to +100℃ with 15-minute soaks.

High Temperature Bias: +125℃ environment while under bias for 1000 hours.

Low Temperature Bias: -40℃ environment while under bias for 1000 hours.

Temperature/Humidity Bias: +85℃/85% relative humidity environment while under bias for 1000 hours.

Mechanical Shock: 3 pulses of 10,000g in the X, Y, and Z directions.

Vibration Test: 10～60Hz: 0.35mm; 60～500Hz: 5g, 1 octave/min, Duration: 15 minutes per plane.

Drop Test: 1.5-meter height onto a concrete surface in three directions while in packaging.

Reflow: 5 reflow cycles with a peak temperature of +260℃.

ESD Protection: 150pF, 330Ohm, contact discharge ±2KV/air discharge ±4KV, 10 times, applying voltage to I/O pins.

Sampling Process

Confirm customer requirements:

Review product application, microphone capsule specifications, usage scenarios, and sound quality needs.

Recommend and specify:

Provide recommended microphone capsule models and detailed specifications for customer evaluation.

Sample provision and testing:

Deliver microphone samples for customer testing and feedback purposes.

Optimize and finalize:

Refine microphone design based on feedback, finalize samples, and proceed to mass production upon quality approval.

Quality Assurance

Conducting sampling inspections of incoming materials to ensure compliance with standard requirements.

Performing inspection audits to ensure the stability and control of the entire manufacturing process.

Conducting pre-shipment inspections to ensure that products meet established quality standards.

Acoustic Laboratory

Testing of background noise, sensitivity, frequency response curve, and directionality indicators.

Verification of the impact of different circuits, structural dimensions, materials, and processes on indicators.

Reliability testing at both the new product design stage and the mass production regular stage.

Automatic Workshop

Utilizing fully automated production lines to ensure high efficiency and consistency.

Equipped with state-of-the-art facilities, including a 10,000-level dust-free workshop.

Employing a rigorous 21-step process to guarantee product stability.