## Technical Overview of SRP4012-R47M The **SRP4012-R47M** is a high-current, shielded power inductor manufactured by **Bourns**. It belongs to the SRP series, which is designed for applications requiring high saturation current and low electromagnetic interference (EMI). --- ### 1. Key Technical Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | The nominal inductance value. | | **Tolerance** | ±20% | Indicated by the "M" suffix. | | **Irms (Heating Current)** | 7.0 A | Current causing a 40°C temperature rise. | | **Isat (Saturation Current)** | 12.0 A | Current causing a 30% drop in inductance. | | **DCR (DC Resistance)** | 14 mΩ (Typ) | Internal resistance of the coil. | | **Operating Temp** | -45°C to +125°C | Standard industrial/automotive range. | | **Dimensions** | 4.4 x 4.0 x 1.0 mm | Compact SMD (Surface Mount Device) profile. | --- ### 2. Component Composition and Design 1. **Core Material:** It typically uses a **metal alloy powder core**. Unlike traditional ferrite cores, metal powder provides "soft saturation" characteristics, meaning the inductance drops gradually rather than abruptly when current increases. 2. **Shielding:** The inductor is **magnetically shielded**. The construction involves molding the wire inside the core material, which minimizes stray magnetic fields and reduces EMI. 3. **Flat Wire Technology:** Many models in this series use flat wire instead of round wire to maximize the cross-sectional area, which lowers the DC Resistance (DCR) and improves efficiency. --- ### 3. Application Use Cases The SRP4012-R47M is primarily used in power management circuits where space is limited but power requirements are high: * **DC/DC Converters:** Used as the energy storage element in buck or boost regulators. * **Consumer Electronics:** Smartphones, tablets, and laptops. * **Power Supplies:** Low-profile VRM (Voltage Regulator Module) applications. * **Industrial:** Portable instrumentation and IoT devices. --- ### 4. Part Number Breakdown The part number can be decoded as follows: * **SRP:** Series Name (Shielded Power Inductor). * **4012:** Dimensions (Approx. 4.0mm width/length, 1.2mm height). * **R47:** Inductance value (R47 = 0.47 µH). * **M:** Tolerance (M = ±20%).