High-Performance Analog MEMS Microphone – Compact & Low Power

ECM-M3722T421 Analog MEMS Microphone - 3.76×2.24mm Compact Package

ECM-M3722T421 Key Features: ±1dB Sensitivity Tolerance, 58dB SNR, 130dB AOP, RF Immunity

ECM-M3722T421 Mechanical Dimensions (3.76×2.24×1.10mm) 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-M3722T421 is a low-power analog MEMS microphone for space-constrained designs. With ±1dB sensitivity, 58dB SNR, and 130dB AOP, it delivers crisp voice pickup in TWS earbuds, smart home devices, and IoT applications—all in a compact 3.76mm package.

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🧪 Sample

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🧭 Trial Order

From 200 pcs
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📦 MOQ

3,000 pcs
Full order minimum

Model: ECM-M3722T421
Dimensions: 3.76 × 2.24 × 1.1 mm
Directivity: Omnidirectional
Sensitivity: -42 dB ± 1
Impedance: 100 Ω
S/N Ratio: 58 dB
Max SPL: 130 dB
Operating Voltage: 2 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 250 μA

Tags: Equipment Mics

Technical Specifications

The ECM-M3722T421 features a precise sensitivity of -42±1dB, ensuring consistent audio capture across mass production. 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. With an industry-leading acoustic overload point of 130 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

Bluetooth Headsets & TWS Earbuds: Ultra-low power consumption and high SNR deliver crystal-clear voice calls and immersive audio.
Smart Home Devices: Suitable for smart speakers, doorbells, and other devices requiring clear audio in noisy environments, thanks to its 130 dB AOP.
Wearable & Portable Electronics: Its miniature size and low profile fit perfectly into wearables, smart glasses, and portable recorders.

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.