9.7mm Omnidirectional Mic Capsule for Indoor Surveillance

9.7 × 4.5 mm omnidirectional microphone capsule with -30dB high sensitivity for indoor surveillance. Korean RF core, 74dB SNR, and 20Hz–16KHz response deliver clear long-distance audio pickup. For a waterproof option, see the IP67-rated version. For pre-attached leads, check the 100mm lead version or the 15mm lead version.

Model: ECM-B9745AL30RC
Dimensions: 9.7 × 4.5 mm
Directivity: Omnidirectional
Sensitivity: -30 dB ± 2
Impedance: 2.2 kΩ
S/N Ratio: 74 dB
Max SPL: 110 dB
Operating Voltage: 2 Vdc
Frequency Response: 50 Hz ~ 20 kHz

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-B9745AL30RC is a 9.7 × 4.5 mm omnidirectional microphone capsule engineered for precision and reliability in indoor surveillance applications. With a high sensitivity of -30dB and a wide frequency range of 20Hz to 16KHz, it excels in capturing sound over long distances with exceptional clarity.

Powered by a stable Korean RF mic core, this capsule delivers consistent performance and a signal-to-noise ratio of 74dB, making it an excellent choice for indoor security cameras, surveillance monitoring devices, and condenser microphones.

Standard Test Circuit

ECM-B9745AL30RC Test Circuit: 2.2kΩ bias, 2V supply, 1μF output

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

Typical Frequency Response

ECM-B9745AL30RC Frequency Response: Flat with 5kHz high-frequency roll-off

Flat frequency response with engineered roll-off above 5kHz.

Dimensions (Unit: mm)

ECM-B9745AL30RC Dimensions: Φ9.7×4.5mm with front dust mesh (sealed enclosure)

Φ9.7×4.5mm housing with front dust mesh (fully sealed back design).

For a waterproof option, see the IP67-rated version. For pre-attached leads, check the 100mm lead version or the 15mm lead version.

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.