4mm Unidirectional Electret Microphone Capsule with Pins

Unidirectional Electret Microphone Capsule with Pins 4mm

B4015UP38-YL microphone circuit diagram and dimensions, showing key components and size

B4015UP38-YL microphone frequency response chart, showing sensitivity and performance across the frequency range

ECMIC microphones 12,000 m² factory with 6M+ units monthly output and ISO/CE certifications

ECMIC microphones automated production line overview, showing assembly and quality control process

The ECM-B4015UP38-YL is a 4 × 1.5 mm unidirectional microphone capsule with a sensitivity of -38dB±2 and a signal-to-noise ratio of 60dB. It is designed for lapel microphones.

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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-B4015UP38-YL
Dimensions: 4 × 1.5 mm
Directivity: Unidirectional
Sensitivity: -38 dB ± 2
Impedance: 2.2 kΩ
S/N Ratio: 60 dB
Max SPL: 110 dB
Operating Voltage: 3 Vdc
Frequency Response: 100 Hz ~ 20 kHz
Current Consumption: 450 μA

Tags: 4mm Electret Conference Mics Pin-type Electret

Technical Specifications

Our 4015 unidirectional pin microphone core features dual capacitors, enhancing its anti-interference capabilities. The 2.8mm pin length ensures clear audio and dependable performance across diverse applications.

Standard Test Circuit

Test conditions: RL = 2.2kΩ, Vs = 2V, C = 1μF

Typical Frequency Response

The response extends from 100Hz to 20kHz, with a steady rise across the spectrum that enhances vocal clarity and presence. Around 10kHz, an additional lift further improves articulation of higher frequencies, making it well-suited for speech capture. The response plateaus briefly before gradually rolling off after 16kHz.

Dimensions (UNIT: mm)

Appearance Dimension

Capsule measures 4mm in diameter and 1.5mm in height. The front features a dustproof mesh, and the rear includes an acoustic port. Equipped with 2.8mm pins for PCB insertion in compact lavalier microphone assemblies, with 1.2mm spacing.

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.