BL-21785-000 Knowles Acoustics, BL-21785-000 Datasheet - Page 20

• 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

20
EC SERIES
EC Series speakers are commonly used in isolating earphones for radio communication.
TEC SERIES
The TEC combines output comparable to the larger BK speaker in an ultra-thin package.
The TEC is suitable for multi-element earphone designs.
DTEC SERIES
The DTEC Series combines two TEC speaker elements with a single round port.
Case size is equivalent to BK/EF. DTEC provides increased output and reduced
vibration compared to a single speaker.
Note: All performance curves are typical
SPECIALTY TRANSDUCERS – Speakers
M M o o d d e e l l
EC-23097-000
EC-23098-000
EC-26368-000
M M o o d d e e l l
TEC-30033-000
M M o o d d e e l l
DTEC-30008-000
– Balanced Armature Speaker 7.57 x 4.31 x 3.67 (mm)
– Balanced Armature Speaker 7.87 x 4.09 x 2.79 (mm)
– Balanced Armature Speaker 7.87 x 4.09 x 5.59 (mm)
Sensitivity @ 1kHz
Sensitivity @ 1kHz
Sensitivity @ 1kHz
(dB SPL)
(dB SPL)
(dB SPL)
108
108
108
119
121
•
•
•
•
•
•
•
•
•
•
•
Similar SPL output to the BK Series
Rounded corners on the face opposite the terminal pad
34% smaller volume than the BK Series
Ultra-thin
Wideband output
DTEC combines two TEC elements
Enables small multi-element designs
Dual elements with single sound port
More output than BK in equal package size
Reduced vibration compared to BK
Improved frequency response compared to BK
Port Location
Port Location
Port Location
12S
12S
12S
12C
12S
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Impedance @ 500Hz
Impedance @ 500Hz
Impedance @ 500Hz
(Ohms)
(Ohms)
(Ohms)
31.5
200
425
54
31
Max SPL @ 500Hz
Max SPL @ 500Hz
Max SPL @ 500Hz
(dB SPL)
(dB SPL)
(dB SPL)
123.5
115
115
114
117
125
120
115
110
105
100
95
90
85
100
130
125
120
115
110
105
100
Max SPL @ 1st Peak
Max SPL @ 1st Peak
Max SPL @ 1st Peak
95
90
85
80
130
125
120
115
110
105
100
95
90
85
80
100
100
(dB SPL)
(dB SPL)
(dB SPL)
2
131.5
130
130
129
129
2
2
3
3
3
4
4
5 6 7 8 9
4
5 6 7 8 9
5 6 7 8 9
FREQUENCY (Hz)
FREQUENCY (Hz)
1k
FREQUENCY (Hz)
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