The **VP4-0047-R** is a high-performance, high-frequency power inductor manufactured by **Eaton (formerly Coiltronics/Bussmann)**. It belongs to the **VERSA-PAC** series, which is known for its versatility in multi-winding applications. --- ### 1. Key Technical Specifications The "VP4" designation refers to the size/package (Size 4), and the "-R" indicates RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Eaton (Coiltronics) | | **Series** | VERSA-PAC (VP) | | **Inductance Range** | 10.7 µH to 384 µH (Configurable) | | **Current Rating (Peak)** | Up to 11.2 Amps (Parallel config) | | **DC Resistance (DCR)** | ~0.021 Ω per winding | | **Winding Count** | 6 independent windings | | **Operating Temp** | -40°C to +125°C | --- ### 2. Physical Construction and Pins The VP4-0047-R is built using a **toroidal ferrite core** housed in a surface-mount (SMD) base. * **Multi-Winding Design:** It contains six identical windings. * **Flexibility:** Because the windings are separate, they can be connected in **series** or **parallel** to change the inductance and current-carrying capacity. * **Isolation:** Each winding is tested for high-voltage isolation (typically 500VAC), making it suitable for flyback transformers or SEPIC converters. --- ### 3. Electrical Configurations The primary advantage of this part is the ability to rewire it on the PCB to achieve different electrical characteristics: #### A. Parallel Configuration By connecting all six windings in parallel, you achieve: * **Lowest Inductance:** High speed/frequency. * **Highest Current:** The current capacity is the sum of all windings. #### B. Series Configuration By connecting the windings in a daisy-chain (end-to-start): * **Highest Inductance:** Useful for smoothing or filtering. * **Lowest Current:** Limited by the rating of a single wire. --- ### 4. Common Applications The VP4-0047-R is used in power electronics where space and efficiency are critical: 1. **DC-DC Converters:** Buck, Boost, and SEPIC topologies. 2. **Flyback Transformers:** Multiple windings allow for multiple output voltage rails. 3. **EMI Filters:** Acting as a common-mode or differential-mode choke. 4. **Telecommunications:** Power supplies for networking hardware. --- ### 5. Part Number Breakdown ```text VP 4 - 0047 - R | | | | | | | +-- RoHS Compliant | | +---------- Base Inductance Value | +----------------- Size / Power Rating (Size 4) +--------------------- Series Name (VERSA-PAC) ```