Close-Talk Headset High SNR Cardioid Electret Mic 10×4.5mm

10 × 4.5 mm unidirectional electret mic capsule for close-talk head-worn headsets. Offers -50dB sensitivity, 65dB SNR, and 125dB max SPL for clear, stable voice pickup in noisy, high-volume environments.

Model: ECM-B1045UML50-25082
Dimensions: 10 × 4.5 mm
Directivity: Unidirectional
Sensitivity: -50 dB ± 2
Impedance: 15 kΩ
S/N Ratio: 65 dB
Max SPL: 125 dB (THD ≤ 1%)
Operating Voltage: 2 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 200 μA

Request Information / Sample

Tell us your project stage. Our engineering team will respond accordingly.

Lead Time

Samples: 1–3 weeks
Mass production: 2–4 weeks

Customization

Application-based engineering support
Structure / sensitivity / acoustic tuning

MOQ

3,000 pcs
Per model / per production batch

Certification

RoHS & UL compliant
Industrial reliability assured

Technical Specifications

The ECM-B1045UML50-25082 is a high-fidelity unidirectional electret microphone capsule with a 10 × 4.5 mm design, tailored for close-talk head-worn headsets and other voice-critical audio devices. With -50dB sensitivity and a 100Hz to 10KHz frequency response, it delivers clear, detailed voice capture for near-mouth communication applications.

The microphone’s low impedance (2KΩ) and solid 65dB signal-to-noise ratio ensure clear, consistent audio performance even in noisy environments. The high maximum SPL of 125dB makes it suitable for high-volume applications, while its 2Vdc operating voltage ensures compatibility with a variety of headset and audio equipment designs.

This microphone capsule is ideal for close-talk head-worn headsets, professional communication headsets, and any application where clear, detailed near-field voice reproduction is crucial.

Standard Test Circuit

ECM-B1045UML50 Test Circuit: 15kΩ bias, 2V supply, 1μF output

15kΩ bias resistor, 2V DC supply, 1μF output capacitor. High-impedance microphone configuration.

Typical Frequency Response

ECM-B1045UML50 Frequency Response: 100Hz-2kHz dip, 2k-10kHz rise, then attenuation

Frequency response features 100Hz–2kHz attenuation with 2k–10kHz emphasis and high-end roll-off, helping deliver clear speech intelligibility for close-talk headset use.

Dimensions (Unit: mm)

ECM-B1045UML50 Dimensions: Φ10×4.5mm with front dust mesh and rear sound inlet

Compact Φ10×4.5mm housing with dual-port acoustic design.

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.