The **47LPQ-4W2R-R** is a specific part number belonging to a series of **Power Inductors**, typically manufactured by companies like **Coiltronics (Eaton)**. These components are designed for high-density, high-current power applications. --- ### 1. Component Overview The 47LPQ series represents a line of low-profile, high-current inductors. They are often used in multi-phase voltage regulator modules (VRMs) and DC-DC converters. | Specification | Details | | :--- | :--- | | **Component Type** | Fixed Power Inductor | | **Series** | 47LPQ (Low Profile / High Current) | | **Inductance Value** | 4.2 µH (Based on "4W2R" notation) | | **Mounting Type** | Surface Mount (SMD) | | **RoHS Status** | Compliant (Indicated by the "-R" suffix) | --- ### 2. Part Number Breakdown The nomenclature for this part can be decoded as follows: 1. **47LPQ**: The product family/series code. It indicates the physical footprint and core material characteristics. 2. **4W2R**: The inductance value. * **4** = Leading digit. * **W** = Decimal point indicator. * **2R** = Remaining digits. * *Note: In many systems, this translates to 4.2 Microhenries (µH).* 3. **-R**: Indicates that the part is RoHS compliant (Lead-free). --- ### 3. Key Technical Features Inductors in this category are engineered for specific performance traits: * **Low Core Loss:** Usually utilizes a ferrite core material to minimize energy loss at high switching frequencies. * **High Saturation Current ($I_{sat}$):** Designed to handle significant current peaks without the magnetic core "saturating" (losing its inductive properties). * **Low DCR (DC Resistance):** Uses flat wire or heavy-gauge windings to minimize heat generation and improve efficiency. * **Compact Footprint:** The "LPQ" designation suggests a low-profile geometry, ideal for slim electronic devices like laptops or servers. --- ### 4. Common Applications These inductors are found in circuits requiring stable power delivery under heavy loads: * **Computing:** Server CPU/GPU power modules (Vcore). * **Telecommunications:** Base stations and networking switches. * **Industrial:** High-efficiency point-of-load (POL) converters. * **Automotive:** Infotainment and ADAS power management. ---