9.7mm Unidirectional Electret Condenser Microphone Element

Unidirectional Electret Condenser Microphone Element 9.7mm

9.7mm unidirectional microphone capsule with RF shielding, ideal for directional sound capture in professional audio devices.

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Minimum order quantities (MOQs) apply.
For audio brands & OEMs
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🧪 Sample

Free (std. models) + shipping

🧭 Trial Order

From 200 pcs (1st order only)

📦 MOQ

5,000 pcs (mixed models allowed)

Model: ECM-B9750UL38-SD1033
Dimensions: 9.7 × 5 mm
Directivity: Unidirectional
Sensitivity: -38dB±2
Impedance: 680Ω
S/N Ratio: 60dB
Max SPL: 110dB
Operating Voltage: 1.5Vdc
Frequency Response: 50Hz~16KHz

Tags: 9.7mm Electret Conference Mics Solder Pads Electret

Technical Specifications

The ECM-B9750UL38-SD1033 is a high-performance unidirectional microphone capsule designed for accurate directional sound capture. Measuring 9.7 × 5 mm, it features dual capacitors and a Korean RF mic core, providing strong RF interference resistance and stable operation.

With a frequency response of 50Hz~16KHz, this capsule delivers clear and natural audio reproduction, making it suitable for directional microphones, conference systems, and high-fidelity audio devices. Its compact design ensures easy integration into various applications.

For devices requiring pre-attached leads, consider the 60mm lead version.

Standard Test Circuit

Test conditions: Load resistor (RL) = 680Ω, Supply voltage (VS) = 1.5V, Coupling capacitor (C) = 1μF.

Typical Frequency Response

Frequency response spans from 100Hz to 16kHz. The curve rises rapidly in the low-frequency range, transitions to a more gradual climb around 2kHz, and begins to roll off after approximately 12kHz.

Dimensions (UNIT: mm)

Appearance Dimension

Diameter: 9.7mm; Height: 5.0mm. The front side is covered with a dustproof mesh, and the back features a sound inlet hole.

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.