9.7mm High SNR Uni Electret Mic Capsule Replacement for Headsets

ECM-B1045UL36 Unidirectional Electret Condenser Microphone Capsule - Main Product View

ECM-B1045UL36 Key Features - PM-EM235Y Replacement, 72dB SNR, -36±2dB Sensitivity, Al-Mg Alloy Housing

ECM-B1045UL36 Mechanical Dimensions and Appearance Drawing (Φ9.7×4.5mm, Unit mm)

ECM-B1045UL36 Frequency Response Curve - 50Hz to 12kHz Voice-Optimized Range

9.7 × 4.5 mm unidirectional electret mic capsule, serving as a direct replacement for the PM-EM235Y in professional headsets. Offers -36dB ±2 sensitivity, an excellent 72dB SNR, and a robust Al-Mg alloy housing for clear voice pickup.

Model: ECM-EM235Y-PM
Directivity: Unidirectional
Sensitivity: -36 dB ± 2
Impedance: 2.2 kΩ
S/N Ratio: 72 dB
Max SPL: 110 dB
Operating Voltage: 2 Vdc
Frequency Response: 50 Hz ~ 12 kHz
Current Consumption: 500 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

3,000–5,000 pcs
Per model / per production batch

Certification

RoHS & UL compliant
Industrial reliability assured

Overview

The ECM-B1045UL36 is a high-performance 9.7 × 4.5 mm unidirectional electret condenser microphone capsule, designed as a drop-in replacement for the PM-EM235Y. Engineered for professional headsets and voice communication devices, it delivers superior speech clarity with a 72dB high signal-to-noise ratio and -36dB ±2 sensitivity. Its durable Al-Mg alloy housing ensures excellent shielding and long-term reliability in demanding environments.

Key Features

Direct Replacement for PM-EM235Y – Drop-in compatible dimensions and pinout, minimizing redesign time for your headset projects.
High Signal-to-Noise Ratio (72dB Typ.) – Exceptionally low self-noise preserves speech intelligibility for crystal-clear voice communication.
Unidirectional Pickup Pattern – Focuses on the speaker’s voice while minimizing background noise and room acoustics.
Robust Al-Mg Alloy Housing – Lightweight yet highly durable, providing excellent EMI shielding and mechanical protection.
High Max SPL (110dB @ THD≤3%) – Handles loud speech and close-miking without distortion.
Wide Operating Voltage Range (1.0–10.0V DC) – Flexible compatibility with various headset and intercom circuit designs.
Stable Low Impedance Output (≤2.2 kΩ) – Ensures reliable signal integrity over long headset cables.

Technical Specifications

Tested under standard conditions to ensure consistent and reliable performance in daily communication use.

Parameter	Specification
Model	ECM-B1045UL36
Type	Electret Condenser Microphone Capsule
Directivity	Uni-Directional
Sensitivity	-36 ±2 dB (RL=2.2kΩ, Vs=2.0V)
Signal-to-Noise Ratio	72 dB (A-weighted, Typ.)
Maximum Input SPL	110 dB (THD ≤ 3%)
Impedance	≤2.2 kΩ (Max)
Standard Operating Voltage	2.0 V DC
Operating Voltage Range	1.0 – 10.0 V DC
Current Consumption	≤500 μA (Max)
Housing Material	Al & Mg Alloys
Dimensions	Φ9.7 × 4.5 mm

Typical Applications

Professional communication headsets (Drop-in replacement for PM-EM235Y)
Call center and customer service headsets
Two-way radios and intercom systems
Gaming headsets and voice chat devices
Aviation and dispatch communication equipment

Advantages

Transitioning to the ECM-B1045UL36 is effortless. As a direct alternative to the PM-EM235Y, it maintains the exact 9.7 × 4.5 mm form factor while delivering a 72dB high SNR and a precise unidirectional pickup pattern. This ensures that the user’s voice is captured with exceptional clarity, while off-axis noise is significantly reduced. Housed in a rugged Al-Mg alloy casing, it is a reliable, high-performance upgrade for professional-grade voice communication systems.