nv/sa
Excellence in physical
SMA 24
Pagina 1 van 3
acoustics
Sint-Niklaas – Belgium
(I + L version)
Multi-Application buzzer
The Sonitron Multi-Application buzzers are low cost commercial grade
components for large volume applications. The SMA series are designed
to meet a wide range of current consumption, voltage, sound pressure,
mounting methods, connection, dimensions and packing requirements. The
buzzers have a built-in oscillator generating their working frequency. They
produce a highly reliable audible tone signal, giving either an extremely
clear and penetrating tone or a soft sound for non-aggressive signals.
ADVANTAGES & APPLICATIONS
ADVANTAGES :
• octagonal form
• models with different pin pitches
• light but solid state construction
• little power consumption, especially the
extra loud LC-versions
• important voltage range (1,5V to 24V)
• easy mountable
• SMT models with heat resistant label for
protection during automatic soldering,
packed in trays for automatic placing
APPLICATIONS :
• portable battery operating devices
• audible alarms
• gas detectors
• weighing and measuring equipment
• medical instrumentation
• timers
• control instrumentation and systems
• copiers
• automobiles
• games and toys
• computer peripherals
• cash registers, etc.
SPECIFICATIONS
Model Sound pressure
dB(A) *
Frequency (+/-
15%) Hz
Operating
voltage
Operating
current
Weight
SMA-24 92 dB(A) 3 kHz 1.5 to 24 Vdc 4.2 mA 4 g
SMA-24L 98 dB(A) 3 kHz 1.5 to 15 Vdc 6.7 mA 4 g
SMAI-24 92 dB(A) ** 3.5 kHz 5 to 24 Vdc 6.2 mA 4 g
* All measurements are made in free air at 21°C, at 30 cm, at 12V. Buzzers soldered on a PCB
board dimensions 24 cm x 11 cm.
** SMAI 24: intermittent pulse rate of 5 Hz (at 15 Vdc). All the other models have a continuous tone.
Operating temperature -20°C to +70°C
Storage temperature -40°C to +85°C
Life time (at 21°C) See expected life time curve in addendum
Case material ABS (UL rating: 94 HB) for pin-versions
PPS (UL rating: 94 V0/5V) for SMD-versions
Standard colour of case Grey
nv/sa
Excellence in physical
SMA 24
Pagina 2 van 3
acoustics
Sint-Niklaas – Belgium
(I + L version)
Multi-Application buzzer
ELECTRICAL PARAMETERS
Sound pressure level vs.
operating voltage
Consumption vs.
operating voltage
SMA-24 +
(I + L version)
All measurements are made at 30 cm in free air at 21°C.
°°: standard versions, respectively SMA-24
DIMENSIONS (All dimensions are in mm)
SMA 24 (I+ L Version)
Pin version
nv/sa
Excellence in physical
SMA 24
Pagina 3 van 3
acoustics
Sint-Niklaas – Belgium
(I + L version)
Multi-Application buzzer
PRODUCT CODIFICATION
I 24 L P10
P15
SMA
↓
Sonitron Multi-
Application
↓
I : Intermittent
↓
Square diameter
(mm)
L : Loud
P 17.5
P 20.32
S
↓
P : Pin distance (in
mm)
S : SMD terminals
LIST OF AVAILABLE PRODUCT TYPES
Version Standard
(°°)
Loud
(L)
Intermittent
(I) (*)
SMA-24 serie SMA-24 P10 SMA-24L P10 SMAI-24 P10
SMA-24 P15 SMA-24L P15 SMAI-24 P15
SMA-24 P17.5 SMA-24L P17.5 SMAI-24 P17.5
SMA-24 P20.32 SMA-24L P20.32 SMAI-24 P20.32
SMA-24 S SMA-24L S SMAI-24 S
(*) When the third pin of the SMAI-24 is left open, the audible signal is intermittent. When the
third pin is connected to the (-), the audible signal is continuous.
MODELS ON REQUEST
The SMA series can be delivered, upon special request, with the following protection :
• 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.
