The **LTHZ-12A-R** is a high-performance **Micro-Sized Piezoelectric Buzzer** (also referred to as a transducer). It is primarily used in consumer electronics, medical devices, and industrial equipment to provide audible feedback or alarms. Below is a breakdown of its technical specifications and electronic characteristics. ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Type** | Piezoelectric Transducer | | **Drive Type** | External Drive (requires an external frequency circuit) | | **Operating Voltage** | 1.0V ~ 25Vp-p (Max) | | **Rated Voltage** | 3.0 Vp-p (Square Wave) | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Sound Pressure Level** | ≥ 75 dB at 10cm (at 3Vp-p, 4kHz) | | **Current Consumption** | ≤ 2 mA | --- ### 2. Physical & Material Attributes * **Dimensions:** Typically ~12mm in diameter and ~3mm in height (Ultra-thin profile). * **Mounting Type:** Surface Mount (SMD). * **Housing Material:** LCP (Liquid Crystal Polymer), designed to withstand high-temperature reflow soldering. * **Lead-Free:** RoHS compliant. --- ### 3. Electronic Characteristics #### A. Capacitance Piezo buzzers act like capacitors in a circuit. The LTHZ-12A-R typically has a capacitance of around **12,000pF to 16,000pF** (at 120Hz). This is a critical factor when designing the driving circuit, as it determines the charging/discharging speed. #### B. External Drive Requirement Unlike "Indicators" which have internal circuitry to create sound when DC power is applied, this "Transducer" requires an **AC signal** or a **PWM (Pulse Width Modulation)** signal. To achieve maximum volume, the input frequency should match the **Resonant Frequency (4kHz)**. #### C. Power Efficiency Because it is a piezoelectric device rather than electromagnetic, it has high impedance and very low current consumption (under 3mA), making it ideal for battery-operated devices. --- ### 4. Typical Application Circuit To drive the LTHZ-12A-R using a microcontroller (MCU), a simple transistor circuit or a CMOS inverter is often used. ```cpp // Logic for driving the buzzer with an MCU (Arduino example) void setup() { pinMode(9, OUTPUT); // Connect to base of transistor } void loop() { tone(9, 4000); // Send 4kHz square wave delay(500); // Sound for 500ms noTone(9); // Stop delay(1000); } ```