BL-21785-000 Knowles Acoustics, BL-21785-000 Datasheet - Page 9
![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
Specialty Transducer Microphones
The Specialty Transducer (ST) product line consists of miniature microphones, speakers, and
assemblies. Hundreds of design possibilities can be applied to your product challenge with our
high-performance microphone designs. Ideal for new product ideas that require premium audio
and very small form factors, solutions include noise canceling, omni-directional and unidirectional
performance. Other variables include size, shape, amplification, sensitivity, low noise, and resistance
to vibration and mechanical shock.
ST components and assemblies are unique in fit, form and function. Our products are designed
into high value applications in markets such as the following:
•
•
•
FG SERIES
Omnidirectional 2.565 DIA x 2.565 (mm)
The FG Series microphone is the world’s smallest electret condenser microphone.
Its cylindrical shape and compact size facilitate compact designs. The FG can
also be used in directional applications as a matched omni-directional pair.
EM SERIES
Omnidirectional 3.63 x 3.63 x 2.28 (mm)
The EM is a popular, alternative omni-directional microphone. The EM can also
be used in directional applications as a matched omni-directional pair.
Note: All performance curves are typical
Communications – headsets, handsets, earpieces, telephony, voice recognition, emergency services, military, surveillance
Pro audio – in-ear speakers, lapel microphones, boom microphones
Medical and more – sensors, audiometers, medical implants
M M o o d d e e l l
FG-23329-C05
FG-23329-P07
FG-23629-P16
FG-23629-C36
FG-23652-C36
FG-23652-P16
FG-23742-D36
FG-23742-P16
FG-26163-000
M M o o d d e e l l
EM-23046-P16
EM-23069-000
– Microphone
– Microphone
Sensitivity @1kHz
Sensitivity @1kHz
(dB re1V/1Pa)
(dB re1V/1Pa)
-33.0±3
-33.0±3
-33.0±3
-33.0±3
-33.0±3
-33.0±3
-43.0±3
-43.0±3
-33.0±3
-36.0±3
-36.0±3
•
•
•
•
•
•
•
•
•
•
Smallest microphone option
High resistance to mechanical shock
Exceptionally low vibration sensitivity
Various responses available
Integral RFI suppression
High resistance to mechanical shock
Improved RFI and EMI
Undamped, screen damped, and internally damped responses
Numerous port locations
Wide range of frequency responses
DC Supply (Vdc)
DC Supply (Vdc)
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
0.9-1.6
1.3
1.3
Current Drain (uA)
Current Drain (uA)
SPECIALTY TRANSDUCERS – Microphones
Max. Amplifier
Max. Amplifier
www.knowles.com
50
50
50
50
50
50
50
50
50
50
50
Max. “A” Weighted
Max. “A” Weighted
Equivalent SPL)
Equivalent SPL)
Noise (1 kHz
Noise (1 kHz
30.0 dB
30.0 dB
28.0 dB
28.0 dB
28.0 dB
28.0 dB
30.0 dB
36.0 dB
93.0 dB
31.0 dB
33.0 dB
-40
-50
-60
-70
-80
-40
-50
-60
-70
-80
100
Impedance (Ohms)
Impedance (Ohms)
100
Nominal Output
Nominal Output
4400
4400
4400
4400
4400
4400
4400
4400
4400
4400
4400
2
2
3
3
4
4
5
5
6 7 8 9
6 7 8 9
3-wire, 1015 mm Shielded Cable
FREQUENCY (Hz)
3-wire, 25.4 mm Shielded Cable
FREQUENCY (Hz)
3-wire, 25.4 mm Litz Wires
3-wire, 25.4 mm Litz Wires
3-wire, 25.4 mm Litz Wires
3-wire, 25.4 mm Litz Wires
1k
1k
RFI Improved Version
RFI Improved Version
RFI Improved Version
RFI Improved Version
Comments
Comments
Tubeless
2
2
3
3
4
4
5
5
6 7 8 9
6 7 8 9
10k
10k
9