Low-Power MEMS Solution for Clear Voice Capture

application scenarios for bluetooth headsets

application scenarios for recording devices

The ECM-M3729-4258M is an ultra-compact analog MEMS microphone designed for high sensitivity and low power consumption, making it an excellent choice for a wide range of consumer electronics. With its exceptional RF immunity and omnidirectional sound capture, this microphone ensures clear and reliable audio recording even in challenging environments.

Model: ECM-M3729-4258M
Dimensions: 3.76 × 2.95 × 1.10 mm
Directivity: Omnidirectional
Sensitivity: -42dB±3
Impedance: 200Ω
S/N Ratio: 58dB
Operating Voltage: 2Vdc
Frequency Response: 100Hz~10KHz

Tags: #Equipment Microphone Capsules

Performance Overview

The ECM-M3729-4258M stands out with its high sensitivity of -42±3dB at 1.6-3.6V, allowing it to capture clear audio even in low-volume settings. Its ultra-compact size of 3.76mm x 2.95mm x 1.10mm makes it perfect for devices where space is at a premium. Operating within a voltage range of 1.6V to 3.6V, this microphone is highly efficient, making it ideal for battery-powered devices. Additionally, its omnidirectional design ensures that sound is captured from all directions, providing full-range audio recording. The microphone also features robust ESD protection of 2kV (HBM), ensuring reliable performance in electrostatic environments, and it operates seamlessly 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.

Standard Test Circuit

Typical Frequency Response

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.