The **SCDR575047-R27** is a specific part number for a Surface Mount Device (SMD) Power Inductor, typically manufactured by companies like Signal Transformer (a Bel group company). It belongs to the **SCDR** series, which is characterized by its high-current capability and compact footprint. ### 1. Technical Specifications The part number itself acts as a code for its primary electrical characteristics: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.27 µH (denoted by "R27") | | **Inductance Tolerance** | Usually ±20% (M) or ±30% (N) | | **Case Size** | 5.7mm x 5.0mm (approximate dimensions) | | **Height** | 4.7mm | | **Current Rating (Isat)** | Typically high, ranging from 15A to 25A (depending on manufacturer) | | **DC Resistance (DCR)** | Extremely low (often < 2.0 mΩ) | --- ### 2. Core Components and Materials This part consists of three main electronic elements: 1. **Magnetic Core:** Usually a **Ferrite** or **Iron Powder** core. Ferrite offers high efficiency and low core losses at high frequencies, while iron powder handles higher saturation currents without dropping inductance sharply. 2. **Winding:** A heavy-gauge copper wire (often flat wire or thick round wire) wound around the core to minimize DC resistance and maximize current handling. 3. **Shielding:** Most SCDR parts are **shielded** (magnetically), meaning the magnetic field is contained within the component. This reduces Electromagnetic Interference (EMI) with neighboring components on the PCB. --- ### 3. Applications Inductors like the R27 are primarily used for power management and energy storage: * **DC-DC Converters:** Used as the main energy storage element in buck (step-down) or boost (step-up) converters. * **Voltage Regulator Modules (VRM):** Commonly found in motherboards and high-end GPUs to provide stable power to CPUs/GPUs. * **Filtering:** Used in LC filters to smooth out ripple current and reduce noise in high-current power rails. --- ### 4. Part Number Breakdown Here is how the nomenclature is generally decoded: | Segment | Meaning | | :--- | :--- | | **SCDR** | Series Name (Shielded Case, Drum & Ring construction) | | **575047** | Dimensions: 5.7mm x 5.0mm footprint, 4.7mm height | | **R27** | Inductance value: "R" acts as decimal point (0.27 µH) |