9.7mm Cardioid Electret Microphone for Automotive Use

Automotive-grade 9.7 × 5 mm unidirectional electret microphone capsule with -45dB±2 sensitivity, 58dB SNR, and 2-pin terminal—engineered for in-vehicle voice control, infotainment, and communication modules.

Model: ECM-B9750UP-45
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -45 dB ± 2
Impedance: 2.2 kΩ
S/N Ratio: 58 dB
Max SPL: 110 dB
Operating Voltage: 2 Vdc
Frequency Response: 100 Hz ~ 10 kHz
Current Consumption: 500 μA

Request a Sample

Evaluate our quality in your application. Standard lead time: 1-3 weeks.

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

Automotive Application Highlights

The ECM-B9750UP-45 is specially engineered for in-vehicle voice interaction systems. It features high sensitivity with tight ±1dB consistency for stable and uniform performance—especially effective when mounted on center consoles or dashboard modules.

This microphone operates reliably in extreme automotive conditions from -40°C to 85°C, and offers excellent resistance to moisture, mechanical impact, and EMI. Its robust structure includes electrostatic discharge protection (level 4) and maintains phase deviation within ≤3°, delivering clean and accurate voice capture for clear, natural sound quality.

Technical Specifications

Crafted for superior noise cancellation and interference resistance, the ECM-B9750UP-45 unidirectional electret microphone capsule delivers exceptional voice performance in automotive settings. Its 2-pin configuration enables seamless integration into diverse vehicle audio and communication modules.

Standard Test Circuit

Tested with RL = 680Ω, Vs = 1.5V, and C = 1μF.

Typical Frequency Response

Frequency response rises steadily from 100Hz to around 6kHz where it peaks, then gradually rolls off. Strong low-frequency gain with moderate fluctuations in the mid to high range.

Dimensions (UNIT: mm)

Appearance Dimension

Φ9.7 × 5.0mm capsule with a front dust mesh and rear acoustic port. Equipped with 2mm pins, with 2.54mm spacing.

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.