9.7mm High-Temp Uni Electret Mic Capsule for Two-Way Radios

9.7 × 6.7 mm unidirectional electret mic capsule with solder terminals for rugged hardwired connections. Features a voice-optimized frequency response, 110dB SPL, and high-temp resistance (-40°C to +85°C)—ideal for two-way radio speaker mics and heavy equipment intercoms.

Model: ECM-F9767AL40HT-Y237-26768
Directivity: Unidirectional
Sensitivity: -40 dB ± 2
Impedance: 2.2 kΩ
S/N Ratio: 66 dB
Max SPL: 110 dB
Operating Voltage: 4.5 Vdc
Frequency Response: 50 Hz ~ 8000 Hz
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-F9767AL40HT-Y237-26768 is a ruggedized 9.7 × 6.7 mm unidirectional electret condenser microphone capsule engineered specifically for two-way radio speaker microphones. Equipped with solder terminals for secure, vibration-resistant hardwiring, it ensures stable audio in demanding environments. With a wide operating temperature range of -40°C to +85°C and a robust Al-Mg alloy housing, it delivers crystal-clear voice transmission while rejecting engine noise, wind, and background chatter.

Voice-Optimized Acoustic Performance

Unlike standard flat-response microphones, this capsule is specifically tuned for maximum speech intelligibility in noisy environments:

Flat Low-to-Mid Range – The frequency response starts from 50Hz and remains flat up to 1.5kHz, ensuring a natural and warm vocal foundation.
+5dB Presence Boost (1.5kHz – 4.5kHz) – A deliberate 5dB rise in this critical speech band enhances voice clarity, making the speaker sound articulate even in loud surroundings.
Sharp High-Frequency Roll-off – Above 4.5kHz, the response drops rapidly. This effectively suppresses harsh sibilance (hissing sounds), prevents acoustic feedback (howling), and cuts out high-frequency environmental noise.
High SPL Handling (110dB @ THD≤3%) – Capable of handling loud shouting or close-miking without audio clipping or distortion.

Key Features

High-Temperature Resistance (-40°C to +85°C) – Reliable operation in sun-baked outdoor environments and hot machinery cabins.
Solder Terminal Design – Highly secure and vibration-resistant hardwired connection, ideal for hand-held speaker mics.
Tight Unidirectional Pattern – Focuses precisely on the user’s voice, drastically reducing ambient noise from engines and crowds.
Stable Sensitivity (-40dB ±2 @ 4.5V) – Optimized for the 4.5V standard operating voltage of portable two-way radios.
Built-in EMI Filtering – Integrated 10pF and 33pF capacitors provide excellent RF interference resistance.

Technical Specifications

Tested under strict reliability standards to maintain performance under extreme temperatures and mechanical vibration.

Parameter	Specification
Model	ECM-F9767AL40HT-Y237-26768
Directivity	Uni-Directional
Sensitivity	-40 ±2 dB (RL=2.2kΩ, Vs=4.5V)
Frequency Response	50Hz ~ 12kHz (Voice-optimized)
Signal-to-Noise Ratio	66 dB (A-weighted, Typ.)
Maximum Input SPL	110 dB (THD ≤ 3%)
Terminals	Solder Pads (Term1+, Term2-)
Impedance	≤2.2 kΩ
Operating Voltage	4.5 V DC (Range: 1.0 – 10.0 V)
Operating Temperature	-40°C ~ +85°C
Housing Material	Al & Mg Alloys
Dimensions	Φ9.7 × 6.7 mm

Typical Applications

Two-Way Radio Speaker Microphones – Remote shoulder mics (PTT mics) for security, logistics, and field operations.
Heavy Equipment Intercoms – Vibration-resistant audio pickup for excavators, cranes, and construction machinery.
Outdoor Access Control Panels – Wired into external entry panels exposed to direct sunlight.
Industrial Headsets – Noise-rejecting voice capture for high-decibel factory floors.