The **ASX04008-R** is a high-quality, miniature surface-mount (SMD) speaker manufactured by **PUI Audio**. It is specifically designed for space-constrained applications that require clear audio output, such as handheld devices or small electronics. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the ASX04008-R: | Parameter | Specification | | :--- | :--- | | **Speaker Type** | Micro Dynamic Speaker | | **Impedance** | 8 Ohms (±15%) | | **Power Rating (Rated/Max)** | 0.8W / 1.0W | | **Sound Pressure Level (SPL)** | 85 dB @ 0.1W/0.1m | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Resonant Frequency (Fo)** | 500 Hz | | **Mounting Type** | Surface Mount (SMD) | | **Dimensions** | 40mm x 40mm x 3.8mm | --- ### ## Key Features 1. **Low Profile Design:** At only 3.8mm thick, it is ideal for thin-profile enclosures where traditional cone speakers would be too bulky. 2. **SMD Reflow Compatible:** Unlike many speakers that require manual soldering or wires, this part can be placed and soldered using automated SMT (Surface Mount Technology) pick-and-place machines. 3. **High-Performance Magnet:** Utilizes a Neodymium (NdFeB) magnet to provide high sensitivity and power handling in a small footprint. 4. **Wide Frequency Response:** Though optimized for voice and signaling, the 500Hz to 20kHz range allows for decent playback of alarms and simple melodies. --- ### ## Typical Applications * **Handheld Medical Devices:** For audible alerts and heart rate monitoring tones. * **IoT Smart Devices:** Used in smart locks, sensors, or hubs for user feedback. * **Industrial Terminals:** For scanners or handheld data collectors. * **Security Systems:** Used in control panels for chimes and alarm signals. --- ### ## Design Considerations When integrating the ASX04008-R into a PCB layout, consider the following: * **Enclosure Tuning:** To maximize the low-end frequency response (500Hz), the speaker should be mounted in a sealed or ported enclosure. Without a baffle, "acoustic shorting" will occur, resulting in very thin sound. * **Heat Sensitivity:** While reflow-compatible, strict adherence to the manufacturer's temperature profile is necessary to prevent damage to the internal diaphragm or voice coil adhesives. * **Polarity:** Ensure the PCB pads match the polarity markings on the speaker to maintain correct phase, especially if using multiple speakers in one device.