The **LPD-23P2-R** is an electronic component primarily categorized as a **Surface Mount (SMT) Piezoelectric Buzzer** (or transducer). These components are widely used in consumer electronics to provide audible feedback, such as beeps or alarms. --- ### 1. Key Technical Specifications The following table outlines the typical electrical and mechanical characteristics of the LPD-23P2-R: | Parameter | Typical Value | | :--- | :--- | | **Rated Voltage** | 3.0 Vp-p (Square Wave) | | **Operating Voltage** | 1.0 ~ 25.0 Vp-p | | **Current Consumption** | ≤ 3 mA (at rated voltage) | | **Sound Pressure Level (SPL)** | ≥ 80 dB (at 10cm) | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Principles To integrate this part into a circuit, it is important to understand its internal design: * **Piezoelectric Element:** Unlike magnetic buzzers that use a coil and a magnet, this device uses a ceramic disk that deforms when an electric field is applied. * **External Drive Requirement:** The "P" in the series often denotes that this is a **transducer**, meaning it does **not** have an internal oscillating circuit. You must provide a square wave (usually 4kHz) from a microcontroller (MCU) to produce sound. * **Polarity:** While many piezo elements are non-polar, SMD versions often have a polarity marking (+) to ensure consistent phase and performance in multi-buzzer arrays. --- ### 3. Circuit Application When designing a PCB for the LPD-23P2-R, consider the following code/hardware logic: ```cpp // Example: Driving the LPD-23P2-R using an Arduino-like PWM void setup() { pinMode(9, OUTPUT); // Connect Buzzer (+) to Pin 9 } void loop() { tone(9, 4000); // Send 4kHz square wave delay(500); // Beep for 500ms noTone(9); // Silence delay(500); } ``` ### 4. Common Use Cases * **Medical Devices:** Pulse monitors or glucose meters for user alerts. * **Handheld Electronics:** Keypad entry confirmation (clicks/beeps). * **White Goods:** End-of-cycle notifications for washing machines or microwaves. * **Security Systems:** Low-battery chirps or entry/exit delays.