The **LSMT2-41161-R** is a specific part number belonging to the series of **SMD (Surface Mount Device) Magnetic Transducers** (buzzers), typically manufactured by companies like **LXD**. It is widely used in portable electronics for providing audible feedback. --- ### 1. Key Specifications The following table highlights the typical electrical and physical characteristics of this component: | Characteristic | Specification (Typical) | | :--- | :--- | | **Type** | Magnetic Transducer (External Drive) | | **Operating Voltage** | 1.0 ~ 2.0 Vo-p (Rated: 1.5 Vo-p) | | **Rated Current** | Max 80 mA | | **Sound Pressure Level (SPL)** | Min 80 dB (at 10cm) | | **Resonant Frequency** | 2,730 Hz | | **Coil Resistance** | 16 ± 3 Ω | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | SMD (Surface Mount) | --- ### 2. Functional Description Unlike an active buzzer, the LSMT2-41161-R is a **passive transducer**. This means: * **External Drive Required:** It does not produce sound just by applying DC voltage. It requires an oscillating signal (Square Wave) at its resonant frequency (approx. 2730 Hz). * **Mechanism:** It consists of a permanent magnet, a coil, and a vibrating metal diaphragm. When AC current passes through the coil, it creates a fluctuating magnetic field that moves the diaphragm, creating sound waves. --- ### 3. Application Circuitry To drive this component using a microcontroller (like an Arduino or ESP32), a simple transistor switching circuit is recommended to protect the I/O pins from high current draw. ```cpp // Example: Generating a tone for LSMT2-41161-R void setup() { pinMode(9, OUTPUT); // Connect to Transistor Base } void loop() { tone(9, 2730); // Send 2.73kHz square wave delay(500); noTone(9); delay(500); } ``` --- ### 4. Physical Dimensions & Layout * **Footprint:** Small form factor (usually around 4x4mm or 5x5mm depending on the exact sub-revision). * **Side Opening:** The "R" in the suffix often denotes a **Side Sound Port**, meaning the sound exits from the side of the casing rather than the top, allowing for lower-profile designs. * **Polarity:** Note the "+" mark on the casing; magnetic transducers are polar components and must be oriented correctly on the PCB.