nv/sa
Excellence in physical
SMA 21
Pagina 1 van 3
acoustics
Sint-Niklaas – Belgium
(LC + LT + LV 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
•
SMD 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-21 85 dB(A) 3.3 kHz 1.5 to 24 Vdc 3.8 mA 2.5 g
SMA-21LT 90 dB(A) 3.3 kHz 1.5 to 15 Vdc 12.5 mA 2.5 g
SMA-21LC 91 dB(A) 3.8 kHz 1.5 to 15 Vdc 1.1 mA 2.5 g
SMA-21LV 87 dB(A) at 3V 3 kHz 2 to 6 Vdc 13 mA at 3V 2.5 g
* All measurements are made in free air at 21°C, at 30 cm, at 12V, except for the SMA-21LV,
which is measured at 3V.
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 21
Pagina 2 van 3
acoustics
Sint-Niklaas – Belgium
(LC + LT + LV version)
Multi-Application buzzer
ELECTRICAL PARAMETERS
Sound pressure level vs.
operating voltage
Consumption vs.
operating voltage
SMA-21 +
(LT + LC + LV version)
All measurements are made at 30 cm in free air at 21°C.
°°: standard versions, respectively SMA-21
DIMENSIONS (All dimensions are in mm)
SMA 21 (LT + LC + LV version):
Pin version:
SMD version:
nv/sa
Excellence in physical
SMA 21
Pagina 3 van 3
acoustics
Sint-Niklaas – Belgium
(LC + LT + LV version)
Multi-Application buzzer
PRODUCT CODIFICATION
21 L C P10
LV T P15
SMA
↓
Sonitron Multi-
Application
↓
Square diameter
(mm)
↓
L : Loud
LV : Low voltage
↓
C : C-MOS
T : Transistor
P17.5
S
↓
P : Pin distance
(in mm)
S : SMD terminals
LIST OF AVAILABLE PRODUCT TYPES
Version Standard
(°°)
Transistor
(LT)
Low Current
(LC)
Low voltage
(LV)
SMA-21 serie SMA-21 P10 SMA-21LT P10 SMA-21LC P10 SMA-21LV P10
SMA-21 P15 SMA-21LT P15 SMA-21LC P15 SMA-21LV P15
SMA-21 P17.5 SMA-21LT P17.5 SMA-21LC P17.5
SMA-21 S SMA-21LT S SMA-21LC S SMA-21LV S
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.
