PDM Digital Output MEMS Microphone – 3.5×2.65×0.98mm

ECM-M3526B371 PDM digital MEMS microphone top view

ECM-M3526B371 features PDM output high AOP multiple modes

ECM-M3526B371 frequency response curve and mechanical dimensions

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

Versatile PDM digital MEMS microphone featuring 130dB AOP, 66dB SNR, and multiple operating modes (Normal/High Performance/ANC/Ultrasonic). Compact 3.5×2.65×0.98mm package perfect for tablets, headsets, and smart home devices.

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🧪 Sample

Standard model free
Shipping cost applies

🧭 Trial Order

From 200 pcs
Test before full order

📦 MOQ

3,000 pcs
Full order minimum

Model: ECM-M3526B371
Dimensions: 3.50 × 2.65 × 0.98 mm
Directivity: Omnidirectional
Sensitivity: -37 dB ± 1
S/N Ratio: 66 dB
Max SPL: 130 dB
Operating Voltage: 1.8 Vdc
Frequency Response: 20 Hz ~ 10 kHz
Current Consumption: 750 μA

Tags: High-SNR Mics MEMS Mics PDM Mics

Technical Specifications

The ECM-M3526B371 is a versatile PDM digital output MEMS microphone with 130dB SPL acoustic overload point and 66dB SNR. Sensitivity is -37dBFS ±1dB with operating voltage of 1.6V to 3.3V. It supports multiple operating modes including Normal (750μA), High Performance (950μA), ANC (1000μA), and Ultrasonic modes (1100μA), allowing designers to optimize power consumption for each application. The compact 3.50×2.65×0.98mm package fits space-constrained designs.

Application Scenarios

Tablets, notebooks, and digital still cameras requiring high-quality audio in compact designs.
Headsets and smart home devices needing low power consumption and high AOP for voice control.
Active Noise Cancellation (ANC) systems and ultrasonic applications requiring specialized operating modes.

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.