4mm SMD Microphone for TWS Earbuds

The ECM-B4013AL-SMD-29 is a 4 × 1.3 mm SMD microphone designed specifically for TWS earbuds. With omnidirectional directivity and a sensitivity of -29dB±2, it ensures effective sound capture.

🚫 Factory direct sales only – no retail.
Minimum order quantities (MOQs) apply.
For compact electronics makers
📞 Contact us for orders & inquiries.

🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-B4013AL-SMD-29
Dimensions: 4 × 1.3 mm
Directivity: Omnidirectional
Sensitivity: -29dB±2
Impedance: 2.2KΩ
S/N Ratio: 65dB
Max SPL: 100dB
Operating Voltage: 2Vdc
Frequency Response: 50Hz~16KHz

Tags: 4mm Electret Equipment Mics

Technical Specifications

Utilizing imported eco-friendly and high-temperature resistant materials, our high-sensitivity 4013 surface-mount microphone head ensures reliable performance under demanding conditions.

Standard Test Circuit

Test conditions: 2.2kΩ bias resistor, 2V supply voltage, 1μF output capacitor.

Typical Frequency Response

Frequency range from 50Hz to 16kHz; relatively flat response from 50Hz to 3kHz, followed by a gradual roll-off from 3kHz to 16kHz.

Dimensions (UNIT: mm)

Appearance Dimension

Compact SMD electret microphone capsule measuring 4mm in diameter and 1.3mm in height.

Packaging Overview

Use ESD-safe reel and carrier tape for packing.
Quantity per reel: approx. 1,000 to 5,000 pcs (varies by model).
Each reel is sealed in a moisture-proof, anti-static bag.
Anti-static measures are strictly followed during packaging.
Labeling includes part number, quantity, lot number, and production date.

Reliability Tests

High Temperature Test: Microphone subjected to +85℃ for 200 hours and exposed to room temperature for 3 hours.

Low Temperature Test: Microphone subjected to -40℃ for 200 hours and exposed to room temperature for 3 hours.

Humidity & Heat Test: Microphone subjected to +55℃, 90% RH for 200 hours and exposed to room temperature for 3 hours.

Hi/Low Temperature Shocking Test: Microphone subjected to [+85℃ 0.5H → room temp 1H → -40℃ 0.5H → room temp 1H] for 10 cycles.

Vibration Test: Microphone subjected to two hours of vibration in x, y, and z directions with frequencies of 10-55Hz and a 1.52mm high amplitude.

Drop Test: Microphone dropped 5 times from a height of 1.0 meter onto a slippery marble floor, without packaging.

Storage Temperature Range: -40℃ to +80℃ (humidity less than 90%).

Operating Temperature Range: -40℃ to +80℃ (humidity less than 90%).

ESD Protection: Microphone withstands electrostatic discharge (ESD) up to ±6KV (contact) and ±8KV (air).

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.