Model: 377A21

$770.00 USD
(Pricing valid in US only)


1/2" prepoplarized random incidence condenser microphone, low sensitivity, high frequency

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Random Incidence
  • Frequency Range: (±2dB) 4 to 25000 Hz
  • Dynamic Range: 162 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response Characteristic (at 0° incidence)Random IncidenceRandom Incidence 
Open Circuit Sensitivity (±2 dB)(at 250 Hz) )-38 dB re 1 V/Pa-38 dB re 1 V/Pa[2] 
Open Circuit Sensitivity (at 250 Hz)12.6 mV/Pa12.6 mV/Pa[2] 
Frequency Range (±2 dB)4 to 25000 Hz4 to 25000 Hz 
Lower Limiting Frequency (-3 dB)1 to 2.4 Hz1 to 2.4 Hz 
Resonant Frequency (90° Phase Shift)21800 kHz21800 kHz[1] 
Inherent Noise20 dB(A) re 20 µPa20 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)162 dB re 20 µPa162 dB re 20 µPa[1][2] 
Temperature Range (Operating)-40 to +248 °F-40 to +120 °C 
Temperature Coefficient of Sensitivity (+14 to +122°F (-10 to +50°C)).003 dB/°F.006 dB/°C[1][2] 
Static Pressure Coefficient-.004 dB/kPa-.004 dB/kPa[1][2] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)±.002 dB/%RH±.002 dB/%RH[1][2] 
Influence of Axial Vibration (0.1g (1 m/s²))67 dB re 20 µPa67 dB re 20 µPa[1] 
Capacitance (Polarized)14 pF14 pF[1] 
Polarization Voltage0 V0 V[3] 
Housing MaterialStainless AlloyStainless Alloy 
Mounting Thread (Preamplifier)0.4606 - 60 UNS11.7 mm - 60 UNS 
Mounting Thread (Grid)0.5 - 60 UNS12.7 mm - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.50 in12.7 mm 
Size - Height (with grid)0.50 in12.7 mm 
Size - Height (without grid)0.46 in11.8 mm 
Weight0.23 oz6.5 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