The **APTE-1141-R** is a specific electronic component, typically categorized as a **piezoelectric transducer** or buzzer. It is commonly used in consumer electronics and industrial devices to provide audible feedback (beeps or alarms). ### 1. Technical Specifications The core electrical characteristics of the APTE-1141-R are summarized in the table below: | Parameter | Specification | | :--- | :--- | | **Type** | Piezoelectric Transducer (External Drive) | | **Rated Voltage** | 3.0 Vp-p (Square Wave) | | **Operating Voltage** | 1.0 ~ 20.0 Vp-p | | **Current Consumption** | Max 3mA at Rated Voltage | | **Sound Pressure Level (SPL)** | Min 75 dB at 10cm / 3.0Vp-p / 4.0kHz | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Capacitance** | 12,000 pF ± 30% at 120Hz | | **Operating Temperature** | -20°C to +70°C | --- ### 2. Physical Construction & Mounting The device is designed for space-saving applications and automated assembly. * **Mounting Style:** Surface Mount Device (SMD). * **Housing Material:** LCP (Liquid Crystal Polymer) or high-temperature plastic suitable for reflow soldering. * **Terminals:** Gold-plated or tin-plated pads for PCB soldering. * **Dimensions:** Usually compact (approx. 11mm x 11mm x 3mm), though exact tolerances vary by batch. --- ### 3. Circuit Integration Unlike an "indicator" (which has internal circuitry and just needs DC power), a **transducer** like the APTE-1141-R requires an external oscillating signal. #### Driving Circuit Example To generate sound, a microcontroller (MCU) must provide a square wave at the resonant frequency (4.0 kHz). ```c // Pseudo-code for driving the APTE-1141-R using an MCU void play_tone(int frequency, int duration_ms) { // Generate PWM signal at specified frequency PWM_Set_Frequency(4000); PWM_Start(); Delay(duration_ms); PWM_Stop(); } ``` --- ### 4. Key Applications * **Handheld Devices:** POS terminals, scanners, and glucose meters. * **Automotive:** Dashboard alerts or touch-button feedback. * **Home Appliances:** Microwave timers, washing machine end-of-cycle alerts. * **Safety Equipment:** Low battery warnings in smoke detectors or CO monitors.