The **WPT-2A2-R** is a specific electronic component, typically categorized as a **Surface Mount (SMD) Power Inductor** or a **Wireless Power Transfer (WPT)** coil component, often manufactured by companies like Sumida or similar specialized magnetics firms. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The "WPT" prefix usually indicates its application in wireless power circuits, while the alphanumeric string defines its form factor and electrical ratings. | Parameter | Typical Value / Description | | :--- | :--- | | **Component Type** | Wireless Power Receiver/Transmitter Coil or Power Inductor | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Core Material** | Ferrite (High permeability) | | **Operating Temperature** | -40°C to +125°C (standard automotive/industrial grade) | | **RoHS Status** | Compliant (Lead-free) | --- ### 2. Key Electronic Characteristics The performance of the WPT-2A2-R is defined by its ability to handle electromagnetic induction with minimal loss. * **Inductance (L):** Usually measured in Microhenries (µH). In WPT systems, this value is tuned to match the resonant frequency (often 110-205 kHz for Qi standards). * **DC Resistance (DCR):** Designed to be extremely low (mΩ range) to minimize heat dissipation and maximize power transfer efficiency. * **Saturation Current ($I_{sat}$):** The point at which inductance drops by a specific percentage (e.g., 30%). This part is built to handle high peak currents without magnetic saturation. * **Quality Factor (Q):** High Q-factor is a hallmark of this series, ensuring low energy loss during the wireless power oscillation cycle. --- ### 3. Structural Construction The WPT-2A2-R utilizes specific materials to optimize the "proximity effect" and "skin effect" common in high-frequency power transfer. * **Wire Type:** Often uses **Litz wire** (multiple thin strands insulated from each other) to reduce AC resistance. * **Shielding:** Features a ferrite sheet backing. This serves two purposes: 1. It directs the magnetic flux toward the charging surface. 2. It shields the internal electronics of the device from electromagnetic interference (EMI). --- ### 4. Common Applications This part is frequently found in compact consumer electronics and industrial IoT devices: 1. **Wearables:** Smartwatches and fitness trackers requiring wireless charging. 2. **Medical Devices:** Sealed sensors that cannot have exposed charging ports. 3. **IoT Nodes:** Small sensors powered by inductive coupling. 4. **Automotive:** Internal cabin sensors or key fob charging modules. --- ### 5. Technical Comparison Typical comparison between WPT-series components: | Feature | WPT-Standard | WPT-2A2-R (High Performance) | | :--- | :--- | :--- | | **Footprint** | Larger | Compact / Low Profile | | **Efficiency** | Standard | High ($>85\%$ when paired) | | **Shielding** | Basic | Enhanced Ferrite |