BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 2

• Manufacturer Part Number: BL-21994-000
• Description: MIC ASSY PIEZO INSTR W/38" CABLE
• Manufacturer: Knowles Acoustics
• Series: BLr
• Type: Piezo Condenserr

Specifications of BL-21994-000

• Sensitivity: -69dB ±3dB
• Voltage - Rated: 3V
• Current: 160µA
• Size / Dimension: Circular - 12.7mm Dia x 25.4mm H
• Impedance: 4K Ohm
• Frequency: 20Hz ~ 10kHz
• Termination: Wire Leads
• Direction: Omnidirectional
• Port Location: Top
• Diameter: 12.7 mm
• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• External Diameter: 12.7mm
• Output Impedance: 4000ohm
• Length: 25.4mm
• Outer Diameter: 12.7mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Filter Type: -
• S/n Ratio: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1002; BL-1994; BL-21994; BL1994

E lement O utline D rawings
1.35 (0.053)
1.35 (0.053)
Negative
Terminal
Negative
Terminal
AMERICAS:
Knowles Acoustics
1151 Maplewood Drive
Itasca, IL 60143 U.S.A.
Phone: [phone]
Fax: [phone]
OK n S ignal P ort L ocation
12S S ignal P ort L ocation
Terminal
Output
Terminal
BL Series Microphone Specifications
Output
0.81 (0.032) Diameter
M odel BL-1670
M odel BL-1671
T hick C ase
T hick C ase
EUROPE:
Knowles Acoustics
York Road, Burgess Hill
West Sussex, RT15 9TT
England
Phone: [phone]
Fax: [phone]
5.59 (0.220)
7.92 (0.312) maximum
Maximum
5.59 (0.220)
maximum
1.57 (0.062)
Terminal
4.14 (0.163)
maximum
Positive
7.92 (0.312)
Terminal
4.14 (0.163)
maximum
Positive
Maximum
JAPAN:
Knowles Acoustics
Kyodo Bloom Building
19-1 Miyasaka 2-Chome
Setagaya-Ku, Tokyo 156, Japan
Phone: [phone]
Fax: [phone]
0.64 (0.025)
Maximum
Solder
Buildup
0.64 (0.025)
Maximum
Solder
Buildup
1.4 (0.055)
Diameter
Outer
www . knowlesacoustics . com
ASIA:
Knowles Acoustics
5F, No. 129, Lane 235, Bauchiau Rd
Shindian City, Taipei 231, Taiwan
Republic of China
Phone: [phone]
Fax: [phone]
1.35 (0.053)
1.3VDC
Negative
Terminal
Standard
The information contained in this literature is based on our experience to date and is believed to
be reliable and subject to change without notice. It is intended as a guide for use by persons having
technical skill at their own discretion and risk. We do not guarantee favorable results or assume
any liability in connection with its use. Dimensions contained herein are for reference purposes only.
For specific dimensional requirements consult factory. This publication is not to be taken as a
license to operate under, or recommendation to infringe any existing patents. This supersedes and
voids all previous literature.
12S S ignal P ort L ocation
M odels BL-1681, BL-1785
Terminal
Output
+
-
Output
T est C ondition
5.59 (0.220)
T hin C ase
Maximum
1.57 (0.062)
Terminal
Positive
2.28 (0.090)
maximum
7.92 (0.312)
Maximum
Black
White
Red
Source Follower
8.2kΩ
8.2kΩ
External Circuitry
External Circuitry
3.0VDC
3.0VDC
0.64 (0.025)
Maximum
Solder
Buildup
47kΩ
47kΩ
1.4 (0.055)
Diameter
Outer
Output
Output
page 2