The **LSMT2-14160-R** is a high-performance, surface-mount (SMT) magnetic transducer (buzzer) typically used in consumer electronics, medical devices, and security systems. It is designed to provide audible feedback while maintaining a small footprint. --- ### 1. Key Technical Specifications Below are the typical electrical and physical parameters for this series: | Parameter | Specification | | :--- | :--- | | **Type** | Magnetic Transducer (External Drive) | | **Rated Voltage** | 1.5V - 12V (Model dependent, typically 3.6V-5V) | | **Operating Voltage** | 3.0 ~ 7.0 Vo-p | | **Rated Current** | Max 80mA ~ 100mA | | **Sound Pressure Level (SPL)** | Min 85dB at 10cm | | **Resonant Frequency** | 2,700 Hz - 3,100 Hz | | **Operating Temperature** | -40°C to +85°C | | **Mounting Type** | Surface Mount (SMT) | --- ### 2. Physical Characteristics * **Dimensions:** Usually around $14 \times 14 \times 6$ mm (indicated by the "1416" in the part number). * **Housing Material:** High-temperature plastic (LCP or PPS) to withstand reflow soldering temperatures. * **Side/Top Port:** The sound emission hole is typically located on the top or side, depending on the specific "R" (Right-angle or Reflow) designation. --- ### 3. Electronic Driving Circuit Unlike "indicators" which have internal oscillators, the **LSMT2-14160-R** is a **transducer**. This means it requires an external square wave signal to produce sound. #### Typical Driving Circuit Example: To drive this component using a microcontroller (MCU), a transistor is required because the MCU pin cannot provide sufficient current. ```cpp // Example: Driving the buzzer with an Arduino-like PWM signal void setup() { pinMode(9, OUTPUT); // Connect to Base of NPN transistor } void loop() { tone(9, 2700); // Send 2.7kHz square wave delay(500); // Beep for 500ms noTone(9); // Silence delay(500); } ``` --- ### 4. Application Considerations 1. **Polarity:** These devices are polarized. Ensure the "+" mark on the casing aligns with the positive side of your circuit. 2. **Back-EMF Protection:** Since it is a magnetic (inductive) load, adding a flyback diode (e.g., 1N4148) in parallel with the transducer is recommended to protect the driving transistor from voltage spikes. 3. **Washing:** If your PCB requires aqueous cleaning, ensure the sound hole is sealed with a removable label (wash-tab) to prevent fluid from damaging the internal diaphragm. ---