SMA & SMAT Series

The Sonitron Multi-Application buzzers (SMA) and transducers (SMAT) are specifically developed to meet a wide range of requirements in sound pressure, dimensions, and mounting methods. These series produce highly reliable audible signals, giving either an extremely clear penetrating tone or a soft sound output. The buzzers and transducers are low-cost commercial-grade components for large volume applications.

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Advantages SMA 

  • Octagonal form
  • Models with different pin pitches 
  • Light but solid-state construction
  • Little power consumption, especially the extra loud LC-versions
  • Wide voltage range ( 1.5V to 24V) 
  • Easy mountable
  • SMA-13 and SMA-17 for applications with limited space 
  • SMD models with heat resistant label for protection during automatic soldering 
  • Automatic Pick & place

Advantages SMAT

  • Octagonal form
  • Models with different pin pitches 
  • Light but solid-state construction
  • Not fixed working frequency
  • Easy mountable
  • SMAT-13 and SMAT-17 for limited space applications
  • SMD models with heat resistant label for protection during re-flow soldering
  • Automatic Pick & place

 

 

Applications 

AlarmsATMMeasuring  & Weighing equipment 

 

Automobiles & trucks Instrumentation & control systemsCopiers 

 

Vendor machineTimers & Clocks 

Specifications SMA

ModelSPL *

(dB(A)

Frequency

+/- 15% (Hz)

Operating Voltage (Min. -max.)Operating current (mA)Weight (g)
SMA-137530001.5 to 241.81
SMA-13LT8230001.5 to 1511.61
SMA-13LC8130001.5 to 150.71
SMA-13LV80 @3V33502 to 413 @3V1
.
SMA-178230001.5 to 243.32
SMA-17LT8630001.5  to 15152
SMA-17LC8935001.5 to 150.82
.
SMA-218533001.5 to 243.82.5
SMA-21LT9033001.5 to 1512.52.5
SMA-21LC9138001.5 to 151.12.5
SMA-21LV87 @3V30002 to 613 @13V2.5
.
SMA-249230001.5 to 244.24
SMA-24L9830001.5 to 156.74
SMAI-2492**35005 to 246.24
.
SMA-308725001.5 to 244.15
SMA-30L97 @9V25003 to 95 @9V5

 

*All measurements are made in free air @21°C @30cm @12Vdc ( Except for the SMA-21LV & SMA-30L). Buzzers soldered on a PCB board with dimensions of 24cm x 11cm.

** SMAI 24: intermittent pulse rate of 5 HZ (@15 Vdc). All the other models have a continuous tone.

Operating temperature -20°C to +70°C
Storage temperature-40°C to +85°C
Lifetime (at 21°C)@12Vdc (L-version working @6Vdc) continuous use min. 100 hours. The SMA-21LV (PIN/SMD) working @3Vdc in continuous use: min. 24hours. All tests are made @20°C mounted on PCB

How to extend the lifetime of the Sonitron SMA series? 

Case material
  • ABS (UL rating: 94 HB) for pin-version, SMA-13/21/30
  • PBT ( Ul rating:94HB) for pin-version, SMA-17/24
  • PPS ( UL rating:94V0/5V) for SMD version, SMA-13/17/21/24/30
Standard color of caseGrey
Weight64g

 

 

Specifications SMAT

ModelSPL *

(dB(A)

Frequency

+/- 15% (Hz)

Operating Voltage (Min. -max.)Operating current (mA)Weight (g)
SMAT-137530001.5 to 241.81
SMAT-178230001.5 to 1511.61
SMAT-218130001.5 to 150.71
SMAT-2480 @3V33502 to 413 @3V1
SMAT-308230001.5 to 243.32

 

Operating temperature-20°C to +70°C
Storage temperature-40°C to +85°C
Lifetime (at 21°C)@12Vpp continuous use in resonance frequency, tested on maximum sound pressure (eg. SMAT-21 @3.75kHz ). Life expectations: min. 100 hours. All tests are made at @20°C mounted on PCB.
Case material
  • ABS (UL rating: 94 HB) for pin-version, SMAT-13/21/30
  • PBT ( Ul rating:94HB) for pin-version, SMAT-17/24
  • PPS ( UL rating:94V0/5V) for SMD version, SMAT-13/17/21/24/30
Standard color of caseGrey
Weight64g

 

 

Sound pressure level vs. voltage

All measurements are made @30 cm in free air @21°C; ** Standard versions respectively SMA-13, SMA-17, SMA-21, SMA-24, and SMA -30.

 

Sound pressure level vs. voltage SMAT series 

 

All measurements are made @30cm in free air @21°C.

 

Drive Circuits ( typical 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 testing the sound pressure level with the transducer connected to the final drive circuit.

Dimensions SMA & SMAT-series (All dimensions are in mm)

Find out more >

*The soundhole of SMA-21 LV has a diameter of 3mm, whereas the other SMA-21 types have a 3.8mm soundhole.

Standard product options 

Option codeexampleDescription
SP01SMAT-21-P10/SP01Contains heavy-duty wires ( plastic insulation)

Only for SMA(T)-21 and SMA(T)-24

SP02SMAT-21-P17.5/SP02Contains heavy-duty wires ( plastic insulation), connection sealed with silicone.

Only for SMA(T)-21 and SMA(T)-24

SP04SMA-13LC-S/SP04The PCB of the buzzer/ transducer is secured with epoxy-adhesive
SP05SMA-24L-P17.5/SP05Extended frequency control (only SMA series)
Wash TabSMAT-13-P7.5 + Wash TabRecommended for automatic washing production process. The PCB is secured with epoxy-adhesive + wash tab upon the sound-emitting hole, avoiding liquid penetration into the cavity.

To be removed after the washing process for good sound output!!!

MCSMA-13-P10-MCAcryl coating (Membrane Coating). Recommended for aggressive, humid, or smoggy environment.
FP13, FP13SR,

FP17, FP17SR,

FP21, FP24, FP30

7 different Foam Patches are available to cover the SMA(T) series for extra acoustic and mechanical stabilization.

*Add an option by mentioning the suffix to the model of the SMA series! 

!! Other options can be made based on your requirements, please contact our support team at support@sonitron.be

KaptonA heat protection label standard for all SMD buzzers, in Kapton material glued on the SMD model of the SMA(T) buzzer. This enables the user to pick up the buzzer by vacuum. During the re-flow soldering process, the heat shield remains on the buzzer and must be removed after soldering.

 

Product codification

 

List of available products 

 

Mounting guidelines for the SMA & SMAT series