nv/sa Excellence in physical acoustics Sint-Niklaas - Belgium SMA 21 (LC + LT + LV version) Multi-Application buzzer Pagina 1 van 3 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 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 Weight * All measurements are made in free air at 21C, at 30 cm, at 12V, except for the SMA-21LV, which is measured at 3V. Operating temperature Storage temperature Life time (at 21C) Case material Standard colour of case -20C to +70C -40C to +85C 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 SMA 21 (LC + LT + LV version) Multi-Application buzzer Pagina 2 van 3 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 21C. : 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 acoustics Sint-Niklaas - Belgium SMA 21 (LC + LT + LV version) Multi-Application buzzer Pagina 3 van 3 PRODUCT CODIFICATION SMA 21 L LV C T Sonitron MultiApplication Square diameter (mm) L : Loud LV : Low voltage C : C-MOS T : Transistor P10 P15 P17.5 S P : Pin distance (in mm) S : SMD terminals LIST OF AVAILABLE PRODUCT TYPES Version SMA-21 serie Standard () Transistor (LT) Low Current (LC) Low voltage (LV) SMA-21 P10 SMA-21 P15 SMA-21 P17.5 SMA-21 S SMA-21LT P10 SMA-21LT P15 SMA-21LT P17.5 SMA-21LT S SMA-21LC P10 SMA-21LC P15 SMA-21LC P17.5 SMA-21LC S SMA-21LV P10 SMA-21LV P15 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.