nv/sa
Excellence in physical acoustics
Sint-Niklaas – Belgium
SMAT-30
Multi-Application Transducer
SMD & Pin version
Pagina 1 van 4
Both the SMA buzzers and the SMAT (Sonitron Multi-Application)
transducers are specially developed to meet a wide range of
requirements in sound pressure, mounting methods, connection
possibilities and dimensions. The transducers do not have a built-in
oscillator. The drive frequency must be generated with electronics
outside the transducer. Recommended drive circuits are described in
this catalogue. Our transducers produce a highly reliable audible tone
signal, giving either an extremely clear and penetrating tone or a soft
sound for non-aggressive signals. They are available in five sizes:
13mm, 17mm, 21mm, 24mm and 30mm.
ADVANTAGES & APPLICATIONS
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ADVANTAGES:
octagonal form
models with different pin pitches
light but solid construction
not fixed working frequency
easily mountable
SMD models with heat resistant labels for
protection during re-flow soldering,
packed in a tray for automatic placing
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APPLICATIONS:
audible alarms
gas detectors
measuring and weighing equipment
medical instrumentation
timers
instrumentation and control systems
copiers
automobiles
games & toys
cash registers, etc.
SPECIFICATIONS
Model
Sound
pressure * Frequency range
dB(A)
300 - 5000 Hz
Capacitance
(+/-30%)
25 nF
Operating
voltage
0 to 30 VAC pp
Weight
5g
SMAT 30 See graph
page 2
* All measurements are made in free air at 21°C at 30 cm at 10Vpp square wave.
The test buzzer is soldered on a PCB board with dimensions 24 cm x 11 cm.
Operating temperature
Storage temperature
Life time (at 21°C)
Case material
Standard colour of case
-40°C to +85°C
-40°C to +85°C
See expected life time curve in addendum
ABS (UL rating: 94 HB) for pin-versions
PPS (UL rating: 94 V0/5V) for SMD-versions
Grey
nv/sa
Excellence in physical acoustics
Sint-Niklaas – Belgium
SMAT-30
Multi-Application Transducer
SMD & Pin version
Pagina 2 van 4
ELECTRICAL PARAMETERS
Sound pressure vs. Frequency
Precision of frequency:
±15%
Operating voltage: 10V (pp) (square wave)
All measurements are made at 30 cm in free air at 21°C.
DIMENSIONS (All dimensions are in mm)
Pin-version
SMD-version
nv/sa
Excellence in physical acoustics
Sint-Niklaas – Belgium
SMAT-30
Multi-Application Transducer
SMD & Pin version
Pagina 3 van 4
DRIVE CIRCUITS
When the transducers are used in a drive circuit at one single frequency, the designer should
bear in mind that the precision of the frequency, as mentioned on the graph “sound pressure
vs. Frequency” is +/- 15%. We therefore recommend to test the sound pressure level with the
transducer connected to the final drive circuit.
nv/sa
Excellence in physical acoustics
Sint-Niklaas – Belgium
SMAT-30
Multi-Application Transducer
SMD & Pin version
Pagina 4 van 4
PRODUCT CODIFICATION
SMA
T
↓
↓
-
30
↓
Transducer
P15
P17.5
P20.32
S
↓
P : Pin distance (in mm)
S : SMD terminals
Sonitron
Multi-
Application
Square diameter (mm)
LIST OF AVAILABLE PRODUCT TYPES
SMAT-30 P15
SMAT-30 P17.5
SMAT-30 P20.32
SMAT-30 S
A heat protection label in capton material is glued on the SMD model of the SMA buzzer.
This enables the user to pick up the buzzer by vacuum.
During the reflow soldering process the heat shield label remains on the buzzer and must be
removed after soldering. These heat protection labels are standard for all SMD buzzers.
MODELS ON REQUEST
The SMA series can be delivered, upon special request, with the following protection :
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Wash tabs
A wash tab is glued on the sound emitting hole of the buzzer to protect it from water
penetrating into the hole of the cavity. The PCB at the back is also sealed with a silicon
film. To order this part, please add WASHTAB to the model number of the SMA series.
Acryl coating
For applications in aggressive humid conditions, models containing a membrane with a
protective coating are available. The protective coating gives a complementary
assurance against smog. Add MC to the model number of the SMA series.
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