Model: 378A21

$1,195.00 USD
(Pricing valid in US only)


377A21 Microphone and 426E01 preamplifier with TEDS

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Random Incidence
  • Frequency Range: (±2dB) 4 to 25000 Hz
  • Dynamic Range: 150 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response CharacteristicRandom IncidenceRandom Incidence 
Sensitivity (±2 dB)-38 dB re 1 V/Pa-38 dB re 1 V/Pa[3] 
Sensitivity12.6 mV/Pa12.6 mV/Pa[3] 
Frequency Range (±2 dB)4 to 25000 Hz4 to 25000 Hz 
Lower Limiting Frequency (3 dB)1.0 to 2.4 Hz1.0 to 2.4 Hz 
Inherent Noise22 dB(A) re 20 µPa22 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)150 dB re 20 µPa150 dB re 20 µPa[1] 
TEDS CompliantYesYes[2] 
Temperature Range (Operating)-40 to +176 °F-40 to +80 °C 
Temperature Coefficient of Sensitivity (+14 to +158°F (-10 to +70°C))0.003 dB/°F0.006 dB/°C[1][3] 
Static Pressure Coefficient-0.007 dB/kPa-0.007 dB/kPa[1][3] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)0.002 dB/%RH0.002 dB/%RH[1][3] 
Influence of Axial Vibration (0.1g (1 m/s²))67 dB re 20 µPa67 dB re 20 µPa[1] 
Polarization Voltage0 V0 V[4] 
Excitation Voltage20 to 30 VDC20 to 30 VDC 
Constant Current Excitation2 to 20 mA2 to 20 mA 
Output Bias Voltage10 to 14 VDC10 to 14 VDC 
Maximum Output Voltage±7 Vpk±7 Vpk 
Output Impedance<50 Ohm<50 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical ConnectorBNC JackBNC Jack 
Mounting Thread (Grid)0.5 - 60 UNS0.5 - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.50 in12.7  
Size - Height (with grid)3.47 in88.3 mm 
Size - Height (without grid)3.46 in87.8 mm 
Weight1.59 oz45 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] TEDS Capable Digital Communication, compliant with IEEE 1451.4
[3] re 250 Hz
[4] Prepolarized
[5] Venting through Preamp.
[6] See PCB Declaration of Conformance PS064 for details.
ACS-63Calibration (with TEDS) of Precision Condenser Microphones and Preamplifiers together (mated pair).(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads None Listed
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones