Low-Power MEMS Solution for Clear Voice Capture

High-performance analog MEMS microphone with -42dBV/Pa ±1dB sensitivity, 58dB SNR, and 132dB AOP. Exceptional RF immunity and unit-to-unit consistency for smartphones, tablets, and microphone arrays.

Model: ECM-M3729T421
Dimensions: 3.76 × 2.95 × 1.10 mm
Directivity: Omnidirectional
Sensitivity: -42 dB ± 1
Impedance: 300 Ω
S/N Ratio: 58 dB
Max SPL: 132 dB
Operating Voltage: 2 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 250 μA

Request a Sample

Evaluate our quality in your application. Standard lead time: 1-3 weeks.

Sample

Samples available
Evaluation available

MOQ

5,700 pcs (1 reel)
Standard production

Certified

RoHS & UL
Quality & safety standards

Technical Specifications

The ECM-M3729T421 is a high-performance analog top port MEMS microphone designed for demanding audio applications. With sensitivity of -42dBV/Pa ±1dB and 58dB SNR, it delivers clean, consistent audio capture across a wide dynamic range. Its industry-leading 132dB SPL acoustic overload point ensures distortion-free recording even in high-volume environments. The microphone features excellent RF immunity, reducing interference in close proximity to antennas. Operating voltage ranges from 1.6V to 3.6V, making it ideal for battery-powered devices. The compact 3.76mm x 2.95mm x 1.10mm package fits easily into space-constrained designs while maintaining reliable performance from -40℃ to +100℃.

Application Scenarios

Smartphones & Tablets: High RF immunity and a wide dynamic range ensure clear calls and accurate recording in close proximity to antennas.
Microphone Arrays: Superior phase consistency and tight sensitivity tolerance make it ideal for beamforming and noise cancellation in smart speakers.
Professional Recording & Cameras: The 132 dB AOP allows for distortion-free recording of concerts and high-volume environments.

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.