Analog MEMS Silicon Microphone for Smartwatch

The ECM-M3722-4256M is a compact omnidirectional microphone capsule ideal for use in Bluetooth TWS earphones, tablets, cameras, and similar applications. With dimensions of 3.76 × 2.24 × 1.1 mm, it offers a sensitivity of -42dB±3 and ensures clear audio transmission with a signal-to-noise ratio of 56dB.

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

Our 3722 silicon microphones, made with high-temperature resistant materials from Japan, ensure both durability and reliability, making them ideal for various applications.

Standard Test Circuit

Typical Frequency Response

Appearance Dimension

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.

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