4mm Voice Recognition Electret Microphone Element with Leads

Voice Recognition Electret Microphone Element with Leads 4mm

The ECM-B4015AL39-L40D is a 4 x 1.5 mm omnidirectional electret mic capsule with 40mm wire leads connector, -39dB±3 sensitivity, and a 61dB SNR, suitable for various applications including surveillance systems.

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Minimum order quantities (MOQs) apply.
For audio brands & OEMs
📞 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-B4015AL39-L40D
Dimensions: 4 × 1.5 mm
Directivity: Omnidirectional
Sensitivity: -39dB±3
Impedance: 2.2KΩ
S/N Ratio: 61dB
Max SPL: 115dB
Operating Voltage: 2Vdc
Frequency Response: 50Hz~20KHz

Tags: 4mm Electret Equipment Mics Wire Connector Electret

Technical Specifications

Our 4015 microphone head undergoes meticulous production, featuring Korean RF JFET, Japanese Toray film, and Murata capacitor components to ensure top-notch performance. With 1.25 terminal welding and a 40mm wire length, it houses an omnidirectional microphone capacitor core for optimal functionality.

Standard Test Circuit

ECM-B4015AL39-L40D Test Circuit: 2.2kΩ bias, 2V supply, 1μF output

2.2kΩ bias resistor, 2V supply, 1μF output capacitor. Standard voice pickup configuration.

Typical Frequency Response

ECM-B4015AL39-L40D Frequency Response: Flat with roll-off above 5kHz

Flat response with gentle roll-off above 5kHz.

Dimensions (Unit: mm)

ECM-B4015AL39-L40D Dimensions: Φ4×1.5mm with front dust mesh (sealed back)

Ultra-compact Φ4×1.5mm with front dust mesh (sealed back design).

Packaging Overview

Standard packaging: 100 pcs per small box.
10 small boxes (1,000 pcs) are combined into one medium carton.
Several medium cartons are further packed into a large outer carton.
Pin-type microphones are protected with foam inside the small box.
Other types are packed directly or sealed in anti-static bags.

Reliability Tests

High Temperature Test: Microphone subjected to +80℃ for 100 hours, followed by 3 hours at room temperature.

Low Temperature Test: Microphone subjected to -40℃ for 100 hours, followed by 3 hours at room temperature.

Humidity & Heat Test: Microphone exposed to +55℃ and 85% relative humidity for 100 hours, followed by 3 hours at room temperature.

Thermal Shocking Test: Microphone subjected to [+80℃ 0.5H → room temp 1H → -40℃ 0.5H → room temp 1H] for 10 cycles, then exposed to room temperature for 3 hours.

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

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

Storage and Operating Temperature Range: Suitable for environments ranging from -35℃ to +60℃.

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.