BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 18

• 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

18
SPECIALTY TRANSDUCERS – Speakers
EH SERIES
EH Series speakers are approximately 2/3 the size of ED speakers and may be used for small
radio communication earphones where ED size does not meet package requirements.
ES SERIES
EH size speaker with integrated Class D power amplifier
EP SERIES
Based on Knowles’ versatile and popular ED speaker, the EP series adds the benefits of
an internal Class-D amplifier. Its compact size and appreciable output power make the EP
speaker suitable for a variety of designs.
Note: All performance curves are typical
M M o o d d e e l l
EH-23030-000
EH-23149-000
EH-27479-000
M M o o d d e e l l
ES-23127-000
ES-23140-000
M M o o d d e e l l
EP-24075-000
– Balanced Armature Amplified Speaker 5.18 x 3.54 x 3.04 (mm)
– Balanced Armature Amplified Speaker 6.32 x 4.29 x 2.99 (mm)
– Balanced Armature Speaker 5.19 x 3.55 x 3.00 (mm)
Sensitivity @ 1kHz
Sensitivity @ 1kHz
Sensitivity @ 1kHz
(dB SPL)
(dB SPL)
(dB SPL)
100
100
100
101
101
106
•
•
•
•
•
•
•
•
•
•
•
•
•
Balanced-armature, magnetic technology to give high efficiency,
stability and reliability
High sensitivity
Various responses, including standard, damped and modified
Low distortion
Self-shielded for low magnetic radiation
EH micro speaker, but with internal, highly-efficient, class D amplifier
Lower current drain prolongs battery life
Lower distortion
Available in a range of SPL ratings
Class D amplified magnetic speaker
Self-shielded to reduce magnetic radiation
125dB SPL maximum output
Three-terminal electrical connection
Port Location
Port Location
Port Location
12C
12C
12C
12C
12C
12C
www.knowles.com
Impedance @ 500Hz
Impedance @ 500Hz
Impedance @ 500Hz
(Ohms)
(Ohms)
(Ohms)
50000
50000
50000
625
110
150
Max SPL @ 500Hz
Max SPL @ 500Hz
Max SPL @ 500Hz
(dB SPL)
(dB SPL)
(dB SPL)
116.5
109
109
109
112
112
120
115
110
105
100
95
90
85
80
120
115
110
105
100
95
90
85
80
120
115
110
105
100
95
90
85
80
100
100
100
Max SPL @ 1st Peak
Max SPL @ 1st Peak
Max SPL @ 1st Peak
(dB SPL)
(dB SPL)
(dB SPL)
2
2
2
126.5
126.5
117.5
115.5
123
124
3
3
3
4
4
4
5 6 7 8 9
5 6 7 8 9
5 6 7 8 9
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1k
1k
1k
2
2
2
3
3
3
4
4
4
5
5
5
6 7 8 9
6 7 8 9
6 7 8 9
10k
10k
10k