## Technical Overview: AS01808MS-SC18-WP-R The **AS01808MS-SC18-WP-R** is a high-performance, miniature dynamic speaker manufactured by **PUI Audio**. It is specifically designed for applications requiring a slim profile, water protection, and high reliability in small electronic devices. --- ### 1. Key Technical Specifications Below are the primary electrical and physical parameters of the component: | Feature | Specification | | :--- | :--- | | **Speaker Type** | Dynamic, Permanent Magnet | | **Rated Power** | 0.8 Watts | | **Maximum Power** | 1.0 Watts | | **Impedance** | 8 Ohms ±15% | | **Sound Pressure Level (SPL)** | 88 dB ±3dB @ 0.1W/0.1m | | **Resonant Frequency (Fo)** | 500 Hz ±20% | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Ingress Protection** | IP67 (Waterproof) | --- ### 2. Physical Characteristics The "SC18" in the part number refers to the specific form factor and connection style. * **Dimensions:** 18mm x 13mm (Rectangular shape). * **Profile:** Ultra-slim (approx. 2.5mm to 3.5mm depth). * **Termination:** Spring Contacts (SC). These allow for "solderless" integration by pressing the speaker against pads on a PCB. * **Diaphragm:** Typically made of PEEK (Polyether ether ketone) or similar high-durability polymer to withstand moisture. --- ### 3. Electronic Design Considerations When integrating this part into a circuit, engineers must consider the following: #### A. Driving Circuit Since it is an 8-ohm speaker, it is best driven by a **Class-D Audio Amplifier** for efficiency. Because the rated power is 0.8W, the amplifier should be current-limited or gain-adjusted to prevent over-excursion of the diaphragm. #### B. IP67 Rating The **-WP** suffix denotes "Waterproof." * The front face of the speaker is sealed. * To maintain the IP67 rating of the overall device, a proper **gasket** must be used between the speaker face and the device housing. #### C. The Spring Contact Interface The **-SC** (Spring Contact) design eliminates the need for lead wires. * **Advantage:** Easier automated assembly (SMT-like placement). * **Requirement:** The PCB landing pads should be gold-plated to prevent oxidation and ensure a stable electrical connection over time. --- ### 4. Common Applications * **IoT Devices:** Smart home sensors and hubs. * **Handheld Terminals:** Industrial scanners or POS systems. * **Wearables:** Medical monitoring devices. * **Outdoor Electronics:** Small radios or GPS units where rain exposure is possible. ---