Low-Power MEMS Solution for Clear Voice Capture

ECM-M3729T421 Analog MEMS Microphone - 3.76×2.95×1.10mm High-Performance Package

ECM-M3729T421 Key Features: 132dB AOP, ±1dB Sensitivity Tolerance, 58dB SNR, RF Immunity

ECM-M3729T421 Mechanical Dimensions (3.76×2.95×1.10mm) and Frequency Response Curve

ECMIC microphones 12,000 m² factory with 6M+ units monthly output and ISO/CE certifications

ECMIC microphones automated production line overview, showing assembly and quality control process

The ECM-M3729T421 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 ±1dB tolerance, 132dB AOP, and exceptional RF immunity, this microphone ensures clear and reliable audio recording even in challenging environments.

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🧭 Trial Order

From 200 pcs
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📦 MOQ

3,000 pcs
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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

Tags: Equipment Mics

Technical Specifications

The ECM-M3729T421 features a precisely controlled sensitivity of -42±1dB, ensuring superior unit-to-unit consistency for high-quality audio applications. Its compact size of 3.76mm x 2.95mm x 1.10mm makes it perfect for space-constrained designs, while its wide supply voltage range (1.6V to 3.6V) is ideal for battery-powered devices. With an industry-leading acoustic overload point of 132 dB SPL, it captures loud sounds without distortion. The microphone also offers excellent RF immunity, reducing interference in high-electromagnetic environments, and operates reliably across a wide temperature range of -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.