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Sonitron SMA-21 technical specifications.
| Number of Terminals | 2 |
| Maximum Resonant Frequency | 3315Hz |
| Frequency Range | 3285 to 3315Hz |
| Min Operating Supply Voltage | 1.5VDC |
| Typical Operating Supply Voltage | 12VDC |
| Max Operating Supply Voltage | 24VDC |
| Maximum Supply Current | 3.8mA |
| Type | Buzzer |
| Minimum Sound Pressure | 85dBAdBA |
| Min Operating Temperature | -20°C |
| Max Operating Temperature | 70°C |
| Cage Code | B1327 |
| EU RoHS | Yes with Exemption |
| HTS Code | 8531809041 |
| Schedule B | 8531800040 |
| ECCN | EAR99 |
| RoHS Versions | 2011/65/EU, 2015/863 |
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