BL-21785-000 Knowles Acoustics, BL-21785-000 Datasheet - Page 10
![MIC ELEMENT PIEZO INSTRUMENT](/photos/0/4/490/bl-21785_sml.jpg)
BL-21785-000
Manufacturer Part Number
BL-21785-000
Description
MIC ELEMENT PIEZO INSTRUMENT
Manufacturer
Knowles Acoustics
Series
BLr
Type
Piezo Condenserr
Specifications of BL-21785-000
Sensitivity
-69dB ±3dB
Voltage - Rated
1.3V
Current
160µA
Size / Dimension
Rectangular - 7.87mm L x 5.54mm W x 2.24mm H
Impedance
4K Ohm
Frequency
20Hz ~ 10kHz
Termination
Solder Pads
Direction
Omnidirectional
Port Location
Side
Directional Properties
Omnidirectional
Operating Voltage
3 V
Dimensions
7.87 mm L x 5.54 mm W x 2.24 mm D
Depth
2.24 mm
Length
7.87 mm
Width
5.54 mm
Transducer Function
Microphone
Device Type
Microphone
Directivity
Omni
External Diameter
1.41mm
Output Impedance
4000ohm
Drain Current Max
160µA
Outer Diameter
1.41mm
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Filter Type
-
S/n Ratio
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
423-1003
BL-1785
BL-21785
BL1785
BL-1785
BL-21785
BL1785
10
SPECIALTY TRANSDUCERS – Microphones
EK/EL SERIES
Omnidirectional (EK), Unidirectional (EL) 4.00 x 5.59 x 2.28 (mm)
EK omnidirectional microphones provide a unique combination of size, performance
and value. Its high electroacoustic sensitivity and low noise make this microphone
an excellent choice for applications where space allows. These popular microphones
are available in many model varieties.
NR SERIES
Noise Canceling 4.00 x 5.59 x 2.28 (mm)
The NR Series close talking microphones deliver state-of-the-art noise canceling performance.
NR microphones are used as headset microphones in the most demanding communication
and speech recognition environments. The NR Series microphones are available in boom
microphone packages. (See the FB Series and PNR/PWP Series for details.)
Note: All performance curves are typical
M M o o d d e e l l
EK-23024-C36
EK-23024-P07
EK-23027-C36
EK-23028-C36
EK-23033-C36
EK-23132-000
EK-23133-C36
EK-23142-C37
EL-23078-000
M M o o d d e e l l
NR-23158-000
NR-23159-000
NR-23160-000
NR-25994-000
– Microphone
Sensitivity @1kHz
Sensitivity @1kHz
– Microphone
(dB re1V/1Pa)
(dB re1V/1Pa)
-33.0±2
-33.0±2
-33.0±2
-37.0±3
-33.0±2
-33.0±2
-33.0±2
-33.0±2
-33.0±2
-38.0±3
-52.0±3
-44.0±3
-38.0±3
•
•
•
•
•
•
•
•
•
•
•
•
Integral FET amplifier
Diaphragm responds to pressure differential giving
high rejection of background noise
Withstands severe environmental conditions
Low vibration sensitivity
High electoacoustical sensitivity
Superior noise canceling performance
Lead attachment available
High resistance to mechanical shock
Available with RFI suppression
Various port locations available
Wide range of frequency responses
High S/N performance
DC Supply (Vdc)
DC Supply (Vdc)
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
0.9-10
1.3
1.3
1.3
1.3
Current Drain (uA)
Current Drain (uA)
Max. Amplifier
Max. Amplifier
www.knowles.com
200
700
50
50
50
50
50
50
50
50
50
50
50
Max. “A” Weighted
Max. “A” Weighted
Equivalent SPL)
Noise (1 kHz
Noise (dBV)
100.0 dB
100.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
26.0 dB
31.0 dB
-100
-100
-100
-100
-40
-50
-60
-70
-80
Impedance (Ohms)
Impedance (Ohms)
-40
-50
-60
-70
-80
100
Nominal Output
Nominal Output
5 6 7 8 9
4400
4400
4400
4400
4400
4400
4400
4400
4400
4400
2500
4400
4400
2
100
3
2
4
5
3
6 7 8 9
4
FREQUENCY (Hz)
Comments
3-wire, 1 m Shielded Cable
5 6 7 8 9
3-wire
2-wire
2-wire
3-wire
1k
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
FREQUENCY (Hz)
Comments
1k
2
2
3
3
4
4
5
5 6 7 8 9
6 7 8 9
10k
10k