KE11021-1212-005
PIEZOCERAMIC BUZZERS
Contents
Page
¡Introduction ................................................2
¡Makeup of piezoceramic buzzer products
...................................................................2
¡Piezoceramic diaphragms..........................3
¡Piezoceramic sounders..............................4
¡Piezoceramic buzzers(EB-type).................9
¡Piezoceramic buzzers(U-type).................15
¡How to use piezoceramic buzzers ...........17
¡Piezoceramic buzzer measurement
method .....................................................18
¡Standard conditions for reliability tests ....19
¡Caution ................................................19
2http://www.fdk.co.jp
■ Introduction
FDK piezoceramic buzzers generate sound
through the bending vibrations of a thin metal
plate adhered to a piezoceramic disc. These
buzzers feature a low power consumption, a
safe, spark-free and non-contact structure, and
a small size and light weight for an easy
mounting to printed circuit boards. As a result,
an increasing number of piezoceramic buzzers
are now used to generate an artificial voice in
combination with voice synthesizing ICs. To
produce high-quality piezoceramic buzzers,
FDK has capitalized on many years of
piezoceramics production and outstanding
ceramic processing technologies and thin film
forming techniques. By adding a sophisticated
audio know-how to this manufacturing expertise,
FDK offers a large array of electronic tone
generating products, such as piezoceramic
diaphragms, sounders and buzzers, to meet
loud sound outputs, wide frequency ranges, and
many other requirements.
Features
■Use of high-performance piezoceramic elements to meet loud sound
volume and wide frequency range needs.
■High quality achieved by integrated in-house production, from
piezoceramic materials to buzzers.
■Clear, pleasant electronic tone.
■Reliable, effective operation in a wide variety of equipment and ambient
conditions.
■A wide, convenient selection from elements to complete buzzer products.
Applications
●Consumer electronic appliances: Refrigerators, microwave ovens,
washing machines, electric fans, VCRs, air conditioners, bath heaters,
sewing machines
●Clocks and toys: Digital clocks and watches, alarm clocks, calculators,
game machines, greeting cards
●Office equipment: Photocopiers, typewriters, cash registers, personal
computers, facsimiles
●Automotive instruments: Speed alarms; reverse drive buzzers; light,
oil, battery, seatbelt check sounders
●Safety and security equipment: Fire alarms, burglar alarms, gas
leakage alarms, keyless entry
●Other electronic equipment: Vending machines, automatic controllers,
bicycle horns, telephones, cameras, strobos
■ Makeup of piezoceramic buzzer products
Piezoceramic buzzers
(EB-,U-types)
Piezoceramic buzzer products
Piezoceramic diaphragms
Piezoceramic sounders
Self-drive
(EF-,OSF-types)
External-drive
(EE-type)
External-drive
(EE-type)
Self-drive
(EF-type)
q
e
w
qe
r
w
r
q Electrode (silver)
w Ceramic disc
e Adhesive
r Metal plate
(brass,stainless steel)
Casing
Piezoceramic diaphragm
Lead wire
Casing
Pot-type piezoceramic diaphragm
Circuit board
Lead wire to power source
Casing
Piezoceramic diaphragm
Lead pin to power source
FPlease refer to page 17 for the difference between external-drive type and self-drive type.
3http://www.fdk.co.jp
■ Piezoceramic diaphragms
qEE: External-drive type
EF: Self-drive type
wOuter diameter of metal plate
in mm
eShape code
rResonant frequency in 0.1 kHz
tTerminal code
●External-drive type diaphragm rating
EE13A-70A 7.0±0.5 400 10,000±30% 30 –20 to +60 13 9 0.22 0.1 ABrass 0.2
EE20A-63A 6.3±0.6 300 10,000±30% 30 –20 to +60 20 14 0.43 0.2 ABrass 0.8
EE27A-39A 3.9±0.5 200 20,000±30% 30 –20 to +60 27 19 0.48 0.25 ABrass 1.6
EE35A-30A 3.0±0.5 200 32,000±30% 30 –20 to +60 35 25 0.58 0.3 ABrass 3.4
Parts
number
Electrical characteristics Dimensions (mm)
Metal plate
Weight
Shape material (g)
Resonant
Resonant Max. input
Rated working Metal plate
Total
Metal plate
frequency
resistance
Capacitance voltage
temperature range
outer diameter
thickness
thickness
(kHz) (
Ω
max.) (pF)
(Vp-p max.)
(°C) (φD) (T) (t)
●Self-drive type diaphragm rating
EF27A-41A 4.1±0.5 300 18,000±30% 30 –20 to +60 27 19 0.48 0.25 BBrass 1.6
EF35A-30A 3.0±0.5 200 30,000±30% 30 –20 to +60 35 25 0.58 0.3 BBrass 3.4
Parts
number
Electrical characteristics Dimensions (mm)
Metal plate
Weight
Shape material (g)
●Shapes
φd
φD
T
t
φd
φD
T
t
A External-drive type B Self-drive type
Piezoceramic
element
outer diameter
(φd)
Piezoceramic
element
outer diameter
(φd)
Resonant
Resonant Max. input
Rated working Metal plate
Total
Metal plate
frequency
resistance
Capacitance voltage
temperature range
outer diameter
thickness
thickness
(kHz) (
Ω
max.) (pF)
(Vp-p max.)
(°C) (φD) (T) (t)
●How piezoceramic diaphragms are named
‰‰ wpÅyeÅ
qwe rt
4http://www.fdk.co.jp
■ Piezoceramic sounders
qEE: External-drive type
EF: Self-drive type
wOuter diameter of casing in mm
eHeight: Approx. height in mm when mounted
rShape code
tOscillating frequency in 0.1 kHz
yTerminal code
uLead wire length: Length in mm from
external surface of casing (omitted when
lead pins)
iRated input voltage: Voltage for measuring
of output sound pressure;for operating
voltage, refer to max. input voltage.
qPiezoceramic sounder: General name
for OSF-type sounders
wShape code
eDimensions: Outer diameter of diaphragm
in mm
rSeries code
●External-drive type sounder rating
Parts
number
Output sound pressure Capacitance Max input
Rated working
Dimensions (mm)
Casing
(dB min.) (pF) voltage
temperature range
Height Shape Terminal
(Measurement condition)
(Vp-p max.) (°C) color
Electrical characteristics Shapes and structures
Weight
(g)
EE1403K-39YB60-5V
65 25 –20 to +60 φ14.8 3.5 BLead wire Black 0.5
EE1707K-40R-3V 73 30 –20 to +70 φ17 8 CLead pin Black 1.3
EE2108K-40R-3V 75 30 –20 to +70 φ21 8.2 DLead pin Black 2.2
EE2109K-25R-12V 85 30 –20 to +70 9 ELead pin Black 2.4
EE2115K-28R-12V 85 30 –30 to +85 9 FLead pin Black 2.2
EE24K-37F110-3V 75 30 –20 to +60 φ24 4.5 GLead wire Black 2.3
EE30K-35F80-3V 75 30 –10 to +60 φ30 5.5 HLead wire Black 4.0
EE3314K-10R-12V 75 30 –20 to +70 φ33.5 14 ILead pin Black 5.2
EE3320K-10R-12V 75 30 –20 to +70 φ33.5 14 JLead pin Black 5.3
EE3406K-10R-60V 80 60 –20 to +70 φ34 6.3 KLead pin Black 3.3
3.9kHz square wave
5Vp-p, 10cm
4,096Hz square wave
3Vp-p, 10cm
4,096Hz square wave
3Vp-p, 10cm
2.5kHz square wave
12Vp-p
,
10cm
2.8kHz square wave
12Vp-p
,
10cm
4,096Hz square wave
3Vp-p
,
10cm
3.5kHz square wave
3Vp-p
,
10cm
1kHz square wave
12Vp-p
,
10cm
1kHz square wave
12Vp-p
,
10cm
1kHz square wave
30Vp-p
,
1m
φ21
(24.5)
φ21
(24.5)
19,000±30%
(1kHz)
19,000±30%
(1kHz)
14,000±30%
(1kHz)
20,000±30%
(1kHz)
20,000±30%
(1kHz)
10,000±30%
(1kHz)
20,000±30%
(1kHz)
56,000±30%
(120Hz)
56,000±30%
(120Hz)
38,000±30%
(120Hz)
(Measurement condition: 25°C±2°C, 45~60% RH)
Outer
diameter
●How sounders are named
[EE- and EF-types]
‰‰ wr KK eu Ïqqp e◊
q w er ty u i
[OSF-type]
ØÍÏ yÍwq Î
qw er
B EE1403K-39YB60-5V
50
2.3 0.5
φ0.8
14.8
20.4
19.8
16.4
0.8
6
1.2 1.2
3.5
3
●External-drive type sounder shapes
Although rated power supply voltage is shown at the end of parts number, refer to the column of maximum input voltage for operation
securing voltage.
5http://www.fdk.co.jp
CEE1707K-40R-3V D EE2108K-40R-3V
E EE2109K-25R-12V
G EE24K-37F110-3V
I EE3314K-10R-12V
K EE3406K-10R-60V
F EE2115K-28R-12V
H EE30K-35F80-3V
J EE3320K-10R-12V
Unit=mm
Recommended sclew fixing torque
M2 round headed small screw: 2.0 kg max.
Recommended sclew fixing torque
M2 round headed small screw: 2.0 kg max.
6.8
6.5
10
2-φ3.5
2-φ1.0
1.2
φ17
10
0.4
0.8
Lead pin close-up
0.3
0.2
22
2.5
10
0.4
0.8
φ21
7
1.2 6.5
10
2-φ3.5
2-φ1.2
0.3
0.2
Lead pin close-up
21 93.5
3.5
24.5
21.0±0.5
1.2
2.0
0.2
0.6
A
Close-up of A
21.0±0.5
21
24.5
96 3.5
3.5
6±0.5
1.2
2.0
3.5
0.2
0.6
A
Close-up of A
110±5
5±2
φ2.2
7
2.2
2.7
φ24
29
34.4
4.5
1.5
5±2
80±5
2-φ2.4
φ30
35±0.1
41
3.0
5.5
φ33.5
35±0.5
14 3.5
3.5
1.2
2.0
0.2
0.6
A
Close-up of A
A
φ33.5
14 6±0.5
35.5±0.5
3.5
3.5
1.2
2.0
3.5
0.2
0.6
Close-up of A
A
3.4
3.4
35
1.2
1.8
0.2
0.6
6.3
φ34
Close-up of A
●External-drive type sounder shapes
6http://www.fdk.co.jp
●External-drive type sounders: sound pressure vs. frequency
120.5 105
100
90
80
70
60
50
EE1707K-40R-3V
120.5 105
110
100
90
80
70
60
EE2115K-28R-12V
0.5 10.2 102
100
90
80
70
60
50
EE3314K-10R-12V
0.5 10.2 1025
100
90
80
70
60
50
EE3406K-10R-60V
0.5 10.2 1025
100
90
80
70
60
50
EE3320K-10R-12V
120.5 105
100
90
80
70
60
50
EE24K-37F110-3V
120.5 105
100
90
80
70
60
50
EE30K-35F80-3V
120.5 105
100
90
80
70
60
50
EE2108K-40R-3V
120.5 105
110
100
90
80
70
60
EE2109K-25R-12V
120.5 105
90
80
70
60
50
40
EE1403K-39YB60-5V
Sound pressure (dB)
Frequency (kHz) Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Sound pressure (dB)
●Example of recommended external-drive type sounder circuit
Ringer IC driveIC drive
Tr drive
Ringer
IC
R1
R2
C1
C2
0.22µF
R1 2k
R4 15k R5 15k
R2 25k
C2C1
R3 2k
Tr1 Tr2
DC+
DC+
R2 C
10k 1nF
R1
120k
C-MOS IC is equivalent to MC14011
Piezoceramic
sounders
Piezoceramic
sounders
0.0047µ
0.0047µ
If R2 & C becomes high oscillateing frequency becomes low,
and if R2 & C becomes low oscillating frequency becomes hight.
By changing of R2 & C,oscillating
frequency changes.
Tr1 & Tr2 is equivalent to 2SC18158L.
Input: square wave, rated voltage (30 Vpp for EE3406K-10R-60V)
Measuring distance: 10 cm (1 m for EE3406K-10R-60V )
7http://www.fdk.co.jp
●Self-drive type sounder rating
Parts
number
Electrical characteristics Shapes and structures Weight
(g)
Oscillation
Output sound pressure
Oscillating
Current
Rated power
Operating
Rated working
Dimensions (mm)
Casing
(dB min.)
Consumption
supply voltage
voltage
temperature range
Height Shape Terminal
sound
(Measurement condition)
(kHz)
(mA max.)
(VDC) (VDC) (°C) color
Above data were obtained by measurement using FDK’s test circuits.
Please refer to each product specification about circuit and components.
●Self-drive type sounder shapes
B OSF-27B, OSF4-27B, OSF5-32B, OSF6-21DA EF3114K-30S-12V
M: Main terminal
F: Feedback terminal
G: Ground
φAB CφEF G
OSF-27B 28.5 6 12 30 3.75 6
OSF4-27B 28.5 7.5 13.5 30 3.75 6
OSF5-32B 33.5 8 14 35 3.75 6
OSF6-21D 22.5 6 12 23 2.5 5
Recommended hole positions on printed circuit board
The OSF6-21D case has the same shape as that of OSF6S-21D
(Measurement condition: 25°C±2°C, 45~60% RH)
Unit=mm
10
R17
Main terminal sign
11 3.5
φ31.1
AG
77°
Soldering
F
120°
120°
φ30
2
0.2
0.6
Close-up of A
M
Ground
Polarity sign
G
F
φA
B
C
4
3-φ1±0.2
φE
120°
G
F
M
Outer
diamete
r
M:Main terminal
F :Feedback terminal
G:Ground
Parts
number
EF3114K-30S-12V
Continuous
75 (12VDC, 1m)
3.0±0.5 10 12 3 to18 –
20 to +60
φ31.1 11 A
Lead pin
Black 5.1
OSF-27B
Continuous
77 (12VDC, 1m)
3.3±0.4 10 12 6 to20 –
20 to +70
φ28.5 12 B
Lead pin
Ivory 3.3
OSF2-27B
Continuous
77 (12VDC, 1m)
3.3±0.4 10 12 6 to20 –
20 to +70
φ28.5 15 C
Lead pin
Ivory 3.3
OSF3-27B
Continuous
75 (12DVC, 1m)
2.9±0.5 10 12 3 to18 –
20 to +70
φ28.5 16.5 C
Lead pin
Ivory 3.5
OSF4-27B
Continuous
75 (12VDC, 1m)
2.9±0.5 10 12 6 to18 –
20 to +70
φ28.5 13.5 B
Lead pin
Ivory 3.6
OSF5-32B
Continuous
90 (24VDC, 1m)
2.5±0.5 30 24 15 to33 –
20 to +70
φ33.5 14 B
Lead pin
Black 5
OSF6-21D
Continuous
70 (12DVC, 1m)
3.7±0.5 10 12 3 to18 –
20 to +70
φ22.5 12 B
Lead pin
Gray 1.7
OSF6S-21D
Continuous
73 (12VDC, 1m)
3.6±0.5 10 12 3 to18 –
20 to +70
φ22.5 12 D
Lead pin
Gray 1.8
8http://www.fdk.co.jp
COSF2-27B, OSF3-27B
D OSF6S-21D
φAB CφEF G
OSF2-27B 28.5 6 15 30 3.75 6
OSF3-27B 28.5 7.5 16.5 30 3.75 6
Dimensions
Parts No.
●Self-drive type sounders: sound pressure vs. input voltage
70
80
90 30
100
0
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
70
80
90 30
100
0
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
EF3114K-30S-12V
EF3114K-30S-12V
OSF5-32B
OSF6-21D
OSF6S-21D
Sound pressure
Current
consumption
Measuring
distance: 1m
70
80
90 30
100
0
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
Measuring
distance: 1m
OSF-27B
OSF2-27B
OSF3-27B
OSF4-27B
Sound pressure
Current
consumption
Sound pressure
Current
consumption
Measuring
distance: 1m
●Example of recommended self-drive type sounder circuit
R2
R3
Tr1
FM
G
R1
R2
R4
R5 R6
M
G
F
R7
C
Tr3 Tr2
D
R2
R3
R1
Tr1
R3 Tr
R1
G
FM
Continuous sound (1) Continuous sound (2) Intermittent sound
Intermittence period
Setting of Tsec.
R5=R6
T=1.4×C×(R4+R5) (Sec.)
Unit=mm
+Polarity sign
G
φAF
B
C4
φE
3-φ1±0.2
F
M
G
120°
6
23±0.3
3-φ0.9±0.1
F
M
G
+Polarity sign
2.5
φ22.5
6
(12)
21 4
120°
M: Main terminal
F: Feedback terminal
G: Ground
M: Main terminal
F: Feedback terminal
G: Ground
M: Main terminal
F: Feedback terminal
G: Ground
Recommended hole positions on printed circuit board
Recommended hole positions on printed circuit board
9http://www.fdk.co.jp
■ Piezoceramic buzzers (EB-type)
●How buzzers are named
[EB-type]
‰ı eq pt Åep ÇÇqrp qw◊
q w er tyu i o
qPiezoceramic buzzer: General name for EB-type buzzers
wOuter dimensions: Approx. outer diameter of casing in mm
eHeight: Approx. height in mm when mounted
rShape code
tOscillating frequency in 0.1 kHz
yOscillation sound: C(continuous sound), I (intermittent sound)
uSpecial specification· · ·K: washable
iLead wire length: Length in mm from external surface of casing
(omitted when lead pins)
oRated power supply voltage· · ·Voltage for measuring of sound
pressure etc.; for operation securing voltage, refer to operating
voltage column.
●EB-type buzzer rating
Parts
number
Weight
(g)
Electrical characteristics Shapes and structures
Oscillation
Sound pressure
Oscillating
Current
Rated power
Operating
Rated working
Dimensions (mm)
Casing
(dB min.) frequency
consumption
supply voltage
voltage
temperature range
Shape
Terminal
Sound
(Distance:m)
(kHz)
(mA max.)
(DC.V) (DC.V) (°C) Height color
F
(Measurement condition: 25°C±2°C, 45~60% RH)
Outer
diameter
F
connection
terminal
FThe condition where the “anti-liquid seal” on the sound hole is removed.
FFrequency of intermittent sound : 100±50msec.
FAs EB2617A-25C-12V has electric connection terminal in the bottom of the fixing hole, fixing of buzzer and electric connecting can be done
at the same time.
EB20A-35CW140-12V
Continuous
70(0.3) 3.5±0.5 4 12 2.4to20 –
10 to +60
φ22 11.5 ALead wire Black 4.2
EB20E-35C-12V
Continuous
70(0.3) 3.5±0.5 4 12 2.4to20 –
20 to +60
φ23 12 BLead pin Black 3.1
EB20Z-32C-9V
Continuous
80(0.3) 3.2±0.5 15 9 2.4to12 –
10 to +80
φ23 12.5 CLead pin Black 4.4
EB2210A-38C-12V
Continuous
75(0.3) 3.8±0.5 10 12 2.4to24 –
10 to +60
φ22.6 9.5 DLead pin Black 2.5
EB23A-30C-12V
Continuous
75(0.3) 3.0±0.5 8 12 2.4to32 –
20 to +60
φ23.5 13.5 ELead pin Black 3.2
EB23B-30C140-12V
Continuous
75(0.3) 3.0±0.5 8 12 2.4to32 –
40 to +60
φ23.5 13.5 FLead wire Black 3.0
EB2505A-31C-12V
Continuous
70(0.3) 3.1±0.5 8 12 3to20 –
20 to +70
φ25 5 GLead pin Black 1.9
EB2505A-31CK-12V
Continuous
70(0.3) 3.1±0.5 8 12 3to20 –
20 to +70
φ25 5 HLead pin Black 2.0
EB2509A-27C-12V
Continuous
70(0.3) 2.7±0.5 15 12 2.4to20 –
20 to +70
φ25.5 9.1 ILead pin Black 3.2
EB2617A-25C-12V
Continuous
70(0.3) 2.6±0.5 10 12 2.4to28 –
30 to +80
φ26 17.3 JBlack 5.2
EB30B-31C-9V
Continuous
70(1.0) 3.1±0.5 12 9 2.4to32 –
20 to +60
φ31.5 19.5 KLead pin Black 7.4
EB30D-31C150-9V
Continuous
70(1.0) 3.1±0.5 12 9 2.4to32 –
20 to +60
φ31.5 19.5 LLead wire Black 8.3
EB3105A-30C140-12V
Continuous
70(0.3) 3.0±0.5 8 12 2.4to15 –
20 to +60
φ31 5 MLead wire Black 3.9
EB3105A-30C-12V
Continuous
70(0.3) 3.0±0.5 8 12 2.4to15 –
20 to +60
φ31 5 NLead pin Black 4.9
EB3120A-35C150-12V
Continuous
90(1.0) 3.5±0.5 15 12 3to20 –
20 to +80
φ31.5 19.5 LLead wire Blue 9.5
EB4015A-30C150-9V
Continuous
80(1.0) 3.0±0.5 15 9 3to12 –
20 to +60
φ40 15.5 OLead wire Black 13.1
EB4015A-30C-9V
Continuous
80(1.0) 3.0±0.5 15 9 3to12 –
20 to +60
φ40 15.5 PLead pin Black 13.0
EB4015B-28C150-24V
Continuous
85(1.0) 2.8±0.5 20 24 3to28 –
20 to +60
φ40 15.5 OLead wire Black 13.7
EB4015B-28C-24V
Continuous
85(1.0) 2.8±0.5 20 24 3to28 –
20 to +60
φ40 15.5 PLead pin Black 13.7
EB4015B-28 I 150-24V
Intermittent
85(1.0) 2.8±0.5 25 24 5to28 –
20 to +60
φ40 15.5 OLead wire Black 13.7
EB4015C-30C150-24V
Continuous
90(1.0) 3.0±0.5 20 24 3to28 –
20 to +60
φ40 15.5 OLead wire Black 13.7
EB5838A-27C180-12V
Continuous
92(1.0) 2.7±0.5 30 12 6to16 –
30 to +70
φ58 37 QLead wire Black 62.0
10http://www.fdk.co.jp
●EB-type buzzer shapes
AEB20A-35CW140-12V B EB20E-35C-12V
C EB20Z-32C-9V
E EB23A-30C-12V
D EB2210A-38C-12V
F EB23B-30C140-12V
Recommended screw fixing torque
M2 round headed small screw: 0.5kgfcm max.
Lead wire Red(+),White(
-
)
Recommended screw fixing torque
M2 round headed small screw: 0.5kgfcm max.
Lead wire Red(+),Black(
-
)
Unit=mm
140±5
φ22
26.5±
32
11.5
2.5
1.0
2.2
2.6
10±3
0.2
0.1
15.6
12
10.5
φ23
25.4
0.8
5.5
+Polarity sign
5.5
0.8
0.7
2
3.6
Close-up of lead pin
+Polarity sign
φ23
11.6
12.5
16.1
0.8
5.5
3.6
2
0.7 5.5
25.4
0.8
Close-up of lead pin
Polarity sign
φ22.6±0.5
9.5±0.3 4.6±0.5
1.0±0.5
15.0±0.5
φ1.0max.
+Polarity sign 5
φ23.5
26.5±0.2
31.5
φ2.3 φ1.5max.
13.5 4.7
2.5
15.24±0.5
+Polarity sign
10±2
140±5
5
φ2.3
2.5
13.5
φ23.5
26.5±0.2
31.5
11http://www.fdk.co.jp
IEB2509A-27C-12V JEB2617A-25C-12V
K EB30B-31C-9V L EB30D-31C150-9V or EB3120A-35C150-12V
+Polarity sign
φ25.5
9.1 3.5
15±0.5
φ1.5max.
+Polarity sign
φ3.5
10 17.3
3.4
φ26.1
34.0
49.0
5±2
150±5
7
3.4
3.8
φ31.5
38±0.3
45
φ3.4
19.5
3
φ3.4
+Polarity sign
19.5 3.5
3
φ1.5max.
20.6±0.5
7
3.4
3.8
φ31.5
38±0.3
45
Unit=mm
Recommended screw fixing torque
M3 round headed small screw: 3.0kgfcm max.
Lead wire Red(+),Black(
-
)
G EB2505A-31C-12V H EB2505A-31CK-12V
5
+Polarity sign
1.2
6.5
φ25
15.0±0.1
15.0
Polarity sign
φ1.2
0.4
0.8
0.3
0.2
Close-up of lead pin
515.0
Anti-liquid seal
+Polarity sign
1.2
6.5
φ25
15.0±0.1
coating agent
φ1.2 Polarity sign
0.4
0.8
0.3
0.2
Close-up of lead pin
12http://www.fdk.co.jp
N EB3105A-30C-12V
P EB4015A or EB4015B
M EB3105A-30C140-12V
O EB4015A or EB4015B or EB4015C
Q EB5838A-27C180-12V
Recommended screw fixing torque
M3 round headed small screw: 3.0kgfcm max.
Lead wire Red(+),Black(
-
)
Recommended screw fixing torque
M4 round headed small screw: 3.0kgfcm max.
Lead wire Red(+),Black(
-
)
5
1.2 6.5
φ31
17.5
φ2.0
φ4.5
17.5
+Polarity sign
0.4
0.8
0.3
0.2
Close-up of lead pin
φ3.5
16.5
φ40
50
60
5
3.5 3.5
30
φ1.5MAX.
15.5
4.5
Slot indicates+pole
140±5
10±3
φ2.3
55
φ31
φ34.5±0.3
39.5
2
16.5
φ3.5
φ40
50
60
3.5
5
5±2
150±5
4.5
15.5
68
72
φ58
37
12 25
φ34
4.5
66
180
10
Recommended screw fixing torque
M2 round headed small screw: 0.5kgfcm max.
Lead wire Red(+),Black(
-
)
●EB-type buzzers: sound pressure vs. input voltage
70
80
90 30
100
00
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
e
qEB20A-35C140-12V
wEB20E-35C-12V
eEB20Z-32C-9V
e
qw
qw
Sound pressure
Currebt
consummption
Measuring
distance: 0.3 m
i
i
r
r
ty
u
u
70
80
90 30
100
00
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
ty
rEB2210A-38C-12V
tEB23A-30C-12V
iEB2505A-31C-12V, EB2505A-31CK-12V
yEB23B-30C140-12V
uEB2509A-27C-12V
Sound pressure
Current
consumption
Measuring
distance: 0.3m
Input voltage (DC. V)
!4
!2!3
oEB2617A-25C-12V
!0EB30B-31C-9V
!1EB30D-31C150-9V
!2EB3105A-30C140-12V
!3EB3105A-30C-12V
!4EB3120A-35C150-12V
!2!3
!4
!0!1
Sound pressure
Current
consumption
Measuring
distance: 1m
70
80
90 30
100
00
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
!5 EB4015A
!6 EB4015B
!8
!8
!7
!7
!5
!77 EB4015C
!8 EB5838A
!6Continuous
!6Intermittent
!5
Sound pressure
Current
consumption
Measuring
distance: 1m
80
90
100 30
110
00
10
20
40
1002030
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
!6Continuous
!6Intermittent
o
o
13http://www.fdk.co.jp
14http://www.fdk.co.jp
●EB2505A-31CK-12V washable type
Washing method
Buzzers of this model is wet-washable. For washing by other methods, please consult our engineers.
Resistance to solvents
EB2505A-31CK-12V buzzers have the following solvent-resistance characteristics. If you are planning to use solvents other than those listed
below, please consult our engineers.
Solvent-resistance test conditions
Dipped in solder pot (at 245±5°C for 8 sec.)
d
d
d
Immersed in solvent (for 30 minutes)
Dried (at 60°C for 30 minutes)
Standard reliability test (refer to P.19)
Test results
Solvent Result
Pure water K
Isopropyl alcohol (IPA) K
Toluene K
Isopropyl alcohol + toluene (1:1) K
Chlorosen K
Methanol ×
Methylenechloride ×K: Satisfactory
Trichloroethylene ××: Unsatisfactory
After washing, remove the “anti-liquid seal” before reuse.
15http://www.fdk.co.jp
■ Piezoceramic buzzers (U-type)
●Information on product naming
[U-type]
Ëw tpÂÎÎÓqw◊
qwerty
●U-type buzzer rating
Parts
number
Electrical characteristics Shapes and structures
qGeneric symbol for U-type piezoceramic buzzers rOscillation sounds: R (continuous sounds), D1(short
wShape number intermittent sounds), D2(long intermittent sounds)
eDimensions: Outer diameter of diaphragm (mm) tSymbol indicating the presence of a horn
yRated power supply voltage:Voltage for measuring
of sound pressure etc.; for operation securing voltage,
refer to operating voltage column.
Oscillation
Sound pressure
Oscillating
Operating
Dimensions (mm)
Casing
(dB min.) frequency
voltage
Height
Shape
Terminal
sound
(Distance:m)
(kHz) (DC.V)
color
Abbre.name
U1
U2
U2H
U4
U8
Weight
(g)
●U-type buzzer shapes
Intermitting period: 10 Hz±30% (short intermittent)
2 Hz±30% (long intermittent)
FHeat resistance of U2 will be up to +85°C
Abbre. name Shape Input voltage characteristics
U1
Recommended screw fixing torque
M4 round headed small screw: 3kgfcm max. (
-
,continuous)(+)(
-
,intermittent)
12
(Measurement condition: 25°C±2°C, 45~60% RH)
Continuous +
short intermittent
Continuous +
short intermittent
Continuous +
long intermittent
Continuous +
long intermittent
Continuous
+ short intermittent
+ long intermittent
Continuous
+ short intermittent
+ long intermittent
Continuous
+ short intermittent
+ long intermittent
Continuous
+ short intermittent
+ long intermittent
Continuous
Continuous
Continuous
10 60
4-φ3.5
50
50
80
10 135
4
R+D1
Black Red Black
0
70
80
90
100
10
0
10 20 30
20
30
40
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
q 12V
w 24V
qContinuous
sound
qw
qIntermittent
sound wIntermittent
sound
Sound pressure
Current consumption
Measuring
distance: 1m
wContinuous
sound
Q
Outer
diameter
Soldered
terminal
Soldered
terminal
Soldered
terminal
Unit = mm
Rated
power
supply
voltage
(DC.V)
Current
consump-
tion
(mA max)
Rated working
temperature
range
(°C)
F
U1-50RD112V 70(1.0) 2.7±0.4 12 12 6 to18 –20 to + 60 80×60 10 Q
Lead wire
White 39
U1-50RD124V 75(1.0) 2.7±0.4 15 24 15 to33 –20 to + 60 80×60 10 Q
Lead wire
White 38
U1-50RD212V 70(1.0) 2.7±0.4 12 12 6 to18 –20 to + 60 80×60 10 Q
Lead wire
White 39
U1-50RD224V 75(1.0) 2.7±0.4 15 24 15 to33 –20 to + 60 80×60 10 Q
Lead wire
White 39
U2-50RD
1
D
2
12V
75(1.0) 2.7±0.4 12 12 6 to18 –20 to + 60 φ60 33 RBlack 70
U2-50RD
1
D
2
24V
80(1.0) 2.7±0.4 15 24 15 to33 –20 to + 60 φ60 33 RBlack 70
U2-50RD
1
D
2
H12V
80(1.0) 2.7±0.4 12 12 6 to18 –20 to + 60 φ90 36 S
Lead wire
Gray 150
U2-50RD
1
D
2
H24V
85(1.0) 2.7±0.4 15 24 15 to33 –20 to + 60 φ90 36 S
Lead wire
Gray 150
U4B-21RM-1 72(1.0) 2.85±0.4 10 13 5 to15 –20 to + 70 φ23 18 TBlack 4
U8-35R9V 80(1.0) 3.3±0.4 20 9 6 to12 –20 to + 60 φ40 23 U
Lead wire
Black 15
U8-35R24V 80(1.0) 3.3±0.4 10 24 15 to33 –20 to + 60 φ40 23 U
Lead wire
Black 15
16http://www.fdk.co.jp
Abbre. name Shape Input voltage characteristics
U2
U2H
U4
U8
Recommended screw fixing torque
M3 round headed small screw: 3.0kgfcm max.
No.1(
-
,long intermittent)
No.2(
-
,short intermittent)
No.3(
-
,continuous)
Recommended screw fixing torque
M5 round headed small screw: 3.0kgfcm max.
Recommended screw fixing torque
M3 round headed small screw: 3.0kgfcm max.
1+23
φ56
39.5
φ60
23.5
2–5×3.5 holes
33
80
70
φ60
3
6
φ90
φ60
φ56
36
46
2–5×7 holes
66.7
3
170
10
Black Red
(+)
GreenWhite
(-,short intermittent)
(-,continuous)
(-,long intermittent)
0
70
80
90
100
10
0
10 20 30
20
30
40
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
q 12V
w 24V
qContinuous
sound
qw
qIntermittent
sound
wIntermittent
sound
wContinuous
sound
Sound pressure
Current consumption
Measuring
distance: 1m
φ24
φ40
3.5
75
10
46
23
15
Black
(
-
)
Red
(+)
q
w
q
w
0
70
80
90
100
10
0
10 20 30
20
30
40
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
q 9V
w 24V
Sound pressure
Current consumption
Measuring
distance: 1m
0
70
80
90
100
10
0
10 20 30
20
30
40
Sound pressure (dB)
Current consumption (mA)
Input voltage (DC. V)
q 12V
w 24V
qContinuous
sound
qw
qIntermittent
sound
wIntermittent
sound
wContinuous
sound
Sound pressure
Current consumption
Measuring
distance: 1m
R
S
16.5
17.7 5
9
φ0.8
φ23±0.5
15±0.3
+Polarity sign
30
40
50
60
70
80
0
2
4
6
8
10
4 6 8 10 12 14 16
Sound pressure (dB/1m)
Current consumption (mA)
Input voltage (DC. V)
Sound pressure
Current consumption
T
U
Unit = mm
17http://www.fdk.co.jp
■ How to use piezoceramic buzzers
Piezoceramic diaphragms have a simple structure consisting of a
piezoceramic disc (piezoceramic element) adhered to a thin metal
(or plastic) plate. When a voltage is charged in the polarization
direction, the piezoceramic element contracts, and expands when
voltage is charged in the reverse direction. The quick contraction-
expansion motions of the piezoceramic element cause the elastic
disk underneath to vibrate and generate sound waves. (See Fig 1)
●How the piezoceramic diaphragm
generates sound
The piezoceramic diaphragm generates sound by either the external-
drive or the self-drive oscillation technique.
●How piezoceramic diaphragms are
supported
Piezoceramic diaphragms are placed in casings equipped with a
resonator, to obtain a required sound output. These diaphragms
are supported inside the casings by either the nodal-circular support
or peripheral support technique, and should be attached to the
support by an elastic adhesive such as a silicone agent.
●Design of the resonator
The piezoceramic diaphragm cannot produce a loud sound volume
only by a nodal-circular or peripheral support, and it is necessary
to tune the diaphragm to the air acoustic impedance, a job done by
the resonator (see Figure 4, cavity v). The resonator is designed
according to the equation below.
Oscillating frequency Features
External-drive
Fig. 2 (a)
Self-drive
Fig. 2 (b)
Operation at any frequency
Resonance at frequency
corresponding to
minimum acoustic
impedance of diaphragm
Easy generation of sound
by nonstable multivibrator
circuit (see recommended
circuit example on page 4).
Derives loud sound output
through positive feedback
oscillation circuit (see
recommended circuit
example on page 6).
Features
Nodal-circular
support
Fig. 3 (a)
Peripheral
support
Fig. 3 (b)
●Allows a virtually free and unrestricted vibration, and
thus closely reproduces the acoustic impedance
characteristics of the diaphragm.
●Provides a greater strength against mechanical stress
and more stable sound performance.
●Particularly suitable for a loud sound volume generation.
●Used to lower the resonance frequency of the
piezoceramic diaphragm by suppressing the peripheral
vibrations.
●May not have enough strength to resist the mechanical
stress at the support area.
12345678
100
90
80
70
Sound pressure (dB)
Input: Square wave 3Vp-p
Measuring distance: 10 cm
(a) Nodal-circular support
12345678
100
90
80
70
Frequency (kHz)
Sound pressure (dB)
Frequency (kHz)
Input: Square wave 3Vp-p
Measuring distance: 10 cm
(b) Peripheral support
Fig. 3: Supporting method
Fig. 4: Resonator for piezoceramic diaphragm
2d
2a
h
t
V
External-drive
circuit
Power
supply
Self-drive circuit Power
supply
Fig. 2: Method of sound generation
(a) External drive
(b) Self drive
Direction of polarization
Fig. 1: Distortion of diaphragm
+
+
–
–
(16a/3π+t)d2 πh
πa2
(Hz)
2π
c
fcav=
Oscillation
mode
Supporting
method
fcav: Resonance frequency of
cavity (Hz)
c: Speed of sound (331+0.6t)×
103 (mm/sec)
a: Radius of sound hole (mm)
d: Radius of supporting ring
(mm)
h: Height of cavity (mm)
t: Thickness of sound hole (mm)
18http://www.fdk.co.jp
●Booster coil
When the generated sound is less audible due to muffling by the casing, a booster coil is
used to amplify the sound (see the righthand figure for an example of a circuit with a booster
coil). Given the rise time and breaking time, t sec., of the switching of the transistor by a
voltage output from an LSI or other components, a counter voltage is generated in proportion
to the coil inductance L and 1/t. Since this counter voltage has a Vp-p several times greater
than the power supply voltage, a proportionally greater sound pressure is obtained. In
some cases, a capacitor and a diode are included in the circuit to absorb surge current
and thus protect the transistor.
■ Piezoceramic buzzer measurement method
●Standard measurement conditions
Temperature: 25±2°C Humidity: 45—60% RH
●Electrical characteristics
1) Resonant frequency and resonant resistance
Measured by an impedance analyzer
2) Capacitance
Measured by a universal bridge or LCR meter (measured between poles at 1 kHz)
●Acoustic characteristics of piezoceramic sounders and buzzers
The oscillating frequency, current consumption and sound pressure are measured by the measuring instruments shown below.
Oscillator Wave shaping circuit Sounder
Sounder
Microphone
Microphone
Microphone
Noise meter
Noise meter
Noise meter
Oscillating circuitDC power supply
DC power supply Ampere meter Buzzer
F
Measuring distance
(a) External-drive
type sounder
(b) Self-drive
type sounder
(c) Buzzer
Fig. 1: Measuring formats for acoustic characteristics
Microphone
Sounder or buzzer
Jig
Fig. 2: Sounder and buzzer placement for measurement
F
Measuring distance
Anechoic room
In the measuring test, sounders and buzzers are placed as follows:
FMeasuring distance
KPiezoceramic sounder (self vibration and separate vibration types)
After measuring the sound pressure level from 10 cm away, the measured value is converted according to the rated distance of
each sounder model.
KPiezoceramic buzzer
After measuring the sound pressure level from 5 cm or 10 cm away, the measured value is converted according to the rated
distance of each buzzer model.
Example of
circuit
LCapacitor
Buzzer
Diode
Tr
19http://www.fdk.co.jp
●Conversion of sound pressure by distance
The sound pressure values shown in this catalog are not directly comparable
because of different measuring distances. Therefore, the following conversion
equation should be used for any comparison.
B = A + 20 log (La/Lb)
A: Sound pressure value at measuring distance of La
B: Sound pressure value at measuring distance of Lb
The relationship between an increase in measuring distance and a lowering of
sound pressure can be estimated by consulting the table below.
Distance increase
2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times 10 times
–
6.02
–
9.54
–
12.04
–
13.98
–
15.56
–
16.90
–
18.06
–
19.08
–
20.00
30
20
10
0
–10
–20
–30
–40 5 10 30 100 200
distance(cm)
Sound pressure attenuation (dB)
■Standard conditions for reliability tests
●High-temperature placement
The product is subjected to its upper limit operation temperature
(t2) for 500 hours.
●Low-temperature placement
The product is subjected to its lower limit operation temperature (t1)
for 500 hours.
●High-temperature and high-humidity
placement
The product is placed in a 60°C, 90—95% RH condition for 500
hours, during which the ON-OFF operation is checked every 30
minutes.
●Temperature cycle
One cycle consists of one hour of the t1routine and one hour of the
t2routine, and a total of 24 cycles are imposed.
●Vibration
The product is shaken for two hours in the same direction for a total
of six hours in three directions, at a frequency of 10-55-10 Hz, an
amplitude of 1.5 mm, and a sweep time of one minute.
●Shock
The product is dropped three times continuously in the same direction
under a gravitational force of 100G, for a total of nine drops in three
directions.
After the completion of each test, the product is left under room
temperature for 24 hours, and then undergoes standard tests; the
measured values, i.e., the value of oscillating frequency, current
consumption, or sound pressure, should not deviate by more than
±10% from the initial measurement values.
Caution
1. When mounting and handling
(1) To prevent malfunctions, install the piezoceramic buzzer or sounder so that it does not come into contact with other
componets on its side or top surface.
(2) Do not block the sound opening of the buzzer or sounder. Maintain a distance of at least 10mm between the sound opening
and any surrounding object. Also, do not cover the sound opening with an adhesive tape or the like. If the sound hole is
blocked, the buzzer or sounder may exhibit abnormal oscillation or stop functioning.
(3) The sound pressure of the buzzer or sounder may be measured after, but not before, it is installed in the host equipment.
When determining the installation position, make sure that adverse acoustic impedance does not exist in the installation
area. If acoustic impedance exists, the buzzer or sounder may exhibit abnormal oscillation or stop functioning.
(4) When securing the buzzer or sounder with screws, tighten the screws within the specified torque range. Use pan-headed
screws and washers so the buzzer or souder casing will not be deformed. A deformed casing may cause the buzzer or
the sounder to exhibit abnormal oscillation or stop functioning.
(5) When stripping a lead wire, do not cut the conductive line inside the coating, thereby ensuring the sound will be properly
generated. Use a stripper suitable for the diameter of the lead wire.
(6) Do not apply strong force to the pins before they are soldered. If the pins are bent or cut due to excessive force, the buzzer
or sounder may not generate sound.
(7) Do not use the wrong polarity. If the buzzer or sounder is improperly connected, the internal circuit may break down when
electricity is applied.
(8)Use the buzzer or sounder within the operation voltage range. A higher voltage may damage the diaphragm and other
componets or cause a fire. With a lower voltage, the sound may not be produced.
(9) Do not apply a DC current to the piezoceramic sounder. Otherwise, silver migration may occur, which will lower the
insulation resistance and cause the sounder to stop functioning.
Sound pressure
drop (dB)
Fig. 3: Distance-sound presssure
conversion chart
20http://www.fdk.co.jp
(10) Use a low-impedance (not more than 100 Ω) power supply for the buzzer; otherwise, the buzzer may exhibit abnormal
oscillation or stop functioning.
(11) Do not interpose a resistance in series between the buzzer and the power supply, else the buzzer may exhibit abnormal
oscillation or stop functioning. If the interposition of a resistance is necessary to adjust the sound volume, insert a capacitor
of approximately 1 µF in parallel, not in series, as shown in Figure 1.
(12) Do not use the buzzer or sounder in a corrosive ambience, such as an ambience containing sulfur hydrides. Otherwise,
a normal sound may not be generated due to corrosion of the componetnts and diaphragm.
(13) When washing, be sure that a solvent or the vapor of a solvent does not infiltrate the buzzer or the sounder, thereby
preventing deterioration and damage by the solvent trapped inside the casing.
(14) Do not drop the buzzer or sounder. When subjected to a mechanical shock, the sounder may accumulate a high voltage
inside its piezoelectric elements, resulting in an electric shock to anyone who touches it. Also if such a sounder is connected
to a circuit, it may damage transistors and/or other electronic components.
Sounders which may have accidentally been subjected to a mechanical shock can be made safe by shorting them between
the poles. Then check the sound pressure, tone and appearance before use.
(15) Take special protective measures to prevent deterioration and breakdowns, whenever the buzzers or sounders are stored
in the following unfriendly areas:
qDusty places rMoist places
wHot or frosty places tHumid places
eAreas exposed to sunlight yAreas exposed to solvents or their vapor
(16) When operating the buzzer or sounder outdoors, protect it from moisture to ensure normal operation.
(17) When soldering on diaphragms, use a solder containing 2% silver and finish each sodering job within 1 second at a soldering
temperature of 300±10°C. If the solder does not contain silver, diaphragm performance may be adversely affected.
When soldering buzzers and sounders having lead pins, complete each soldering job manually within 3 seconds at a
sodering temperature of 300—320°C Moreover, in the case of the EE1707K, EE2108K, EB2505A and EB3105A models,
manually complete each soldering job within 5 seconds at 260±5°C.
(18) To protect an LSI from a counter voltage of the sounder, which may be caused by an external mechanical shock, connect
a Zener diode or varister in parallel to the LSI, as shown in Figure 2.
2. When storing
To prevent deterioration and/or breakdowns, do not store buzzers and sounders in the following places:
qDusty places tHumid places
wHot or frosty places yAreas exposed to solvents or their vapor
eAreas exposed to sunlight uAreas exposed to corrosive gases, such as H2S
rPlaces with leaking or infiltrating water
3. Other precautions
qTo maintain the initial performance and safety standard of the buzzer or sounder, do not disassemble, repair or
modify it.
wThe products contain the lead so that the disposal of industrial wastes has to be required.
Piezoceramic
buzzer
Fig. 1
VDD
3KΩ max.
LSI
Fig. 2
Piezoceramic
buzzer
1µF
FDK
Web Site
Electronics sales div.
5-36-11, Shinbashi, Minato-ku, Tokyo 105-8677, Japan (Hamagomu Bldg.)
TEL: (81)-3-5473-4662 FAX: (81)-3-3431-9436
U.S.A. FDK AMERICA, INC. CORPORATE OFFICE
2270 North First Street, San Jose, California 95131-2022, U.S.A.
TEL: (1)-408-432-8331 FAX: (1)-408-435-7478
FDK AMERICA, INC. BOSTON OFFICE
411 Waverley Oaks Road, Suite 324, Waltham,
Massachusetts 02452-8437, U.S.A.
TEL: (1)-781-899-7700 FAX: (1)-781-899-7701
FDK AMERICA, INC. SAN DIEGO OFFICE
6540 Luck Blvd Suite C274 San Diego,
California 92121-2766, U.S.A.
TEL: (1)-858-558-8368 FAX: (1)-858-558-6005
Europe FDK ELECTRONICS GMBH
Hansaallee 177C, 40549 Düsseldorf, Germany
TEL: (49)-211-591574 FAX: (49)-211-593549
FDK ELECTRONICS UK LIMITED
Suite 4C Celect House 12A Fairbairn Road, Kirkton North Livingston EH54 6TS,
Scotland, United Kingdom
TEL: (44)-1506-467981 FAX: (44)-1506-467982
Asia FDK HONG KONG LTD.
Unit 18. 15/F., Chevalier Commercial Centre, 8 Wang Hoi Road,
Kowloon Bay, Hong Kong
TEL: (852)-27999773 FAX: (852)-27554635
FDK SINGAPORE PTE., LTD.
4, Leng Kee Road, #06-07/08 SiS Building, Singapore. 159088,
Republic of Singapore
TEL: (65)-472-2328 FAX: (65)-472-5761
For improvement of its products, FDK reserves the right to change specifications
without prior notice to customers.
