## Overview of AS09008PO-2-R The **AS09008PO-2-R** is a high-performance, low-profile **micro speaker** manufactured by **PUI Audio**. It is designed specifically for space-constrained electronic devices that require clear audio output, such as handheld scanners, medical instruments, and IoT devices. --- ### Technical Specifications The following table outlines the primary electronic and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Transducer Type** | Dynamic (Moving Coil) | | **Rated Power** | 0.5 Watts | | **Max Power** | 0.8 Watts | | **Impedance** | 8 Ohms ±15% | | **Sensitivity (SPL)** | 82 dB ±3dB @ 0.1W/0.1M | | **Resonant Frequency (Fo)** | 500 Hz ±20% | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Magnet Material** | NdFeB (Neodymium) | | **Dimensions** | 9mm x 9mm x 4mm | | **Mounting Type** | Surface Mount (SMD) | --- ### Core Electronic Components The AS09008PO-2-R consists of several internal electronic and mechanical parts that allow it to function as a transducer: 1. **Neodymium Magnet (NdFeB):** Uses high-grade rare earth magnets to provide a strong magnetic field within a very small footprint, ensuring high efficiency. 2. **Voice Coil:** A precision-wound copper coil that reacts to the incoming electrical signal. As current flows, it creates a fluctuating magnetic field that interacts with the permanent magnet. 3. **Diaphragm:** Typically made of PEEK or similar high-performance polymers, the diaphragm moves air to create sound waves when driven by the voice coil. 4. **SMD Pads:** Gold-plated solder pads on the bottom of the casing allow the part to be integrated directly onto a PCB via automated reflow soldering. --- ### Implementation Considerations When integrating this part into a circuit, consider the following: * **Amplifier Matching:** Ensure the audio amplifier is stable at **8 Ohms**. Using a Class-D amplifier is common for these speakers to maintain power efficiency. * **Polarity:** Observe the polarity markings (usually a '+' sign or a notch) to ensure phase consistency, especially if using multiple speakers. * **Enclosure Design:** Because this is a tiny speaker, the "back-volume" (the sealed space behind the speaker) significantly impacts the bass response and overall sound quality. * **Reflow Soldering:** As an SMD component, it follows standard lead-free reflow profiles, but care must be taken not to exceed the maximum temperature to avoid melting the internal diaphragm.