Model: 377C20

$770.00 USD
(Pricing valid in US only)


1/2" random Incidence, prepolarized condenser microphone 50 mV/Pa (+/-1.5 dB)

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Random Incidence
  • Frequency Range: (±2dB) 3.15 to 16000 Hz
  • Inherent Noise: 14 dB(A) re 20 µPa
  • Dynamic Range: 146 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response CharacteristicRandom IncidenceRandom Incidence 
Open Circuit Sensitivity (±1.5 dB)-26 dB re 1 V/Pa-26 dB re 1 V/Pa[2] 
Open Circuit Sensitivity50 mV/Pa50 mV/Pa[2] 
Frequency Range (±2 dB)3.15 to 16000 Hz3.15 to 16000 Hz 
Frequency Range (±1 dB)5 to 6300 Hz5 to 6300 Hz 
Lower Limiting Frequency (-3 dB)1.0 to 2.4 Hz1.0 to 2.4 Hz 
Resonant Frequency (90° Phase Shift)12000 Hz12000 Hz[1] 
Inherent Noise14 dB(A) re 20 µPa14 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)146 dB re 20 µPa146 dB re 20 µPa[1] 
Standards Designation (IEC 61094-4)WS2DWS2D 
Temperature Range (Operating)-40 to +248 °F-40 to +120 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C))0.005 dB/°F0.009 dB/°C[1][2] 
Static Pressure Coefficient-0.01 dB/kPa-0.01 dB/kPa[1][2] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH[2] 
Influence of Axial Vibration (0.1g (1 m/s²))63 dB re 20 µPa63 dB re 20 µPa[1] 
Capacitance (Polarized)11 pF11 pF[1] 
Polarization Voltage0 V0 V[3] 
Housing MaterialStainless AlloyStainless Alloy 
Mounting Thread0.4606 - 60 UNS11.7 mm - 60 UNS 
Mounting Thread0.5 - 60 UNS12.7 mm - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.5 in12.7 mm 
Size - Height (with grid)0.64 in16.2 mm 
Size - Height (without grid)0.6 in15.3 mm 
Weight0.28 oz7.8 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] re 250 Hz
[3] Prepolarized
[4] See PCB Declaration of Conformance PS167 for details.
ACS-20Calibration of Precision Condensor Microphones(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads None Listed
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones

Comparison of 1/2" vs 1/4" condenser microphones