The **LSMT2-32151-R** is a high-performance, surface-mount (SMT) magnetic buzzer/transducer designed for compact electronic devices. It is widely used in applications requiring audible feedback where space is limited. --- ### 1. Technical Specifications The following table highlights the core electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Type** | Magnetic Transducer (External Drive) | | **Rated Voltage** | 1.5 Vp-p | | **Operating Voltage** | 1.0 ~ 2.0 Vp-p | | **Rated Current** | Max 100 mA | | **Sound Pressure Level (SPL)** | Min 85 dB @ 10cm | | **Resonant Frequency** | 3200 Hz | | **Coil Resistance** | 6.0 ± 1.0 Ω | | **Operating Temperature** | -40°C to +85°C | | **Dimensions** | 3.2 x 3.2 x 1.5 mm | --- ### 2. Key Components & Working Principle The LSMT2-32151-R operates as an **Electro-Magnetic Transducer**. Unlike an indicator (which has built-in circuitry), this part requires an external oscillating signal. * **The Coil:** A copper wire winding that creates a magnetic field when current flows through it. * **The Diaphragm:** A flexible metal disk. When the magnetic field fluctuates (due to an AC or square wave signal), the diaphragm is pulled and released rapidly, creating sound waves. * **The Magnet:** Provides a permanent magnetic bias to increase sensitivity and efficiency. --- ### 3. Application Circuitry To drive this component, you typically use a transistor-driven circuit connected to a PWM (Pulse Width Modulation) pin of a microcontroller. ```cpp // Example: Driving the LSMT2-32151-R with Arduino int buzzerPin = 9; // Connect to a transistor base driving the buzzer void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { // Generate a 3200Hz square wave (Resonant Frequency) tone(buzzerPin, 3200); delay(500); noTone(buzzerPin); delay(500); } ``` --- ### 4. Design Considerations * **Driving Signal:** It is an "External Drive" type. You must provide a square wave at the resonant frequency (3200Hz) to achieve the maximum volume (85dB). * **Polarity:** As an SMT magnetic part, it is polar. Ensure the "+" mark on the casing matches the positive side of your driving circuit. * **Reflow Soldering:** The part is designed for SMD pick-and-place and can withstand standard lead-free reflow profiles. ---