| Image | Model | Size | Pattern | Sensitivity | SNR | EMI Protection | Termination | Key Feature |
|---|---|---|---|---|---|---|---|---|
| ECM-B9745UL-35 | 9.7×4.5mm | Uni-directional | -35dB | 56dB | External dual capacitor + ferrite bead | Solder pad | Enhanced EMI protection |
| ECM-B9750UL38-630 | 9.7×5mm | Uni-directional | -38dB | 70dB | Built-in dual capacitor | Solder pad | High SNR 70dB |
| ECM-715N | 9.7×5mm | Bi-directional | -47dB | 55dB | Built-in ferrite bead | Solder pad | Bi-directional + ferrite |
| ECM-B4015AP28-1046 | 4×1.5mm | Omnidirectional | -28dB | 58dB | Built-in dual capacitor | Pin 2.8mm | Ultra-compact 4mm |
| ECM-B1465AL30-279 | 14×6.5mm | Omnidirectional | -30dB | 72dB | Built-in dual capacitor | Solder pad | High SNR 72dB |
Dual capacitor RF shielding
Built-in or external dual capacitor structure cancels high-frequency RF interference from WiFi, Bluetooth, two-way radios, and cellular base stations. Prevents RF noise from entering the audio path.
Ferrite bead integration
Strategically placed ferrite beads suppress EMI spikes before they reach sensitive audio circuits. Eliminates buzzing, clicking, and transient noise from VFDs, motors, and switching power supplies.
Shielded housing & premium components
Fully shielded microphone housing with premium-grade components. Reduces conducted and radiated interference, ensuring signal integrity in high-noise environments.
Shielded wire & impedance matching
Shielded wire lead options block conducted EMI. Optimized impedance matching ensures plug-and-play compatibility — no additional tuning required.
| Parameter | Requirement | Why It Matters |
|---|---|---|
| EMI Protection | Dual capacitor / Ferrite bead / Shielded housing | Suppresses RF interference, EMI spikes, and conducted noise |
| Sensitivity | -28dB to -47dB (varies by model) | Balanced sensitivity prevents interference amplification |
| SNR | 55dB to 72dB | Higher SNR ensures clean signal extraction from noisy environment |
| Termination | Solder pad or pin type — shielded options available | Proper termination prevents conducted EMI pickup |
Quick Selection Guide
Choose by your interference type and form factor.
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