## SC1813FH-R18: Technical Overview The **SC1813FH-R18** is a surface-mount (SMD) power inductor, commonly used in high-frequency DC-DC converter applications. It belongs to a class of shielded power inductors designed for compact electronic circuits. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the SC1813FH-R18: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.18 µH | | **Tolerance** | ±20% (Typical for the "M" class) | | **DC Resistance (DCR) Max** | ~0.003 Ω (3.0 mΩ) | | **Saturation Current (Isat)** | ~11.0 A - 13.0 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 1813 (Approx. 4.5 x 4.5 x 3.2 mm) | | **Shielding** | Shielded Construction | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying its function: * **SC**: Series identifier (typically indicating a shielded power inductor). * **1813**: The physical footprint/size (Length x Width). * **FH**: High-frequency / High-current characteristic designation. * **R18**: The Inductance value. The "R" acts as a decimal point. **R18 = 0.18 µH**. --- ### 3. Electronic Features & Applications #### Core Features * **Low DCR:** The very low direct current resistance minimizes power loss and heat generation, increasing overall circuit efficiency. * **High Saturation:** Designed to handle high current spikes without the inductance value dropping significantly. * **Magnetic Shielding:** Reduces Electromagnetic Interference (EMI), which is critical for densely packed PCB layouts. #### Common Applications 1. **Voltage Regulator Modules (VRMs):** Found in motherboards and GPU power phases. 2. **DC-DC Converters:** Used in step-down (Buck) converters for mobile devices. 3. **Battery Powered Equipment:** Where high efficiency and small form factor are required. 4. **Telecommunications:** Used in signal filtering and power management for high-speed data equipment. --- ### 4. Typical Connection Diagram (Buck Converter) In a standard application, this inductor is placed between the switching node and the output capacitor: ```mermaid graph LR SW[Switching Node] --> L1[SC1813FH-R18] L1 --> Vout[Filtered Output] Vout --> C1[Capacitor to Ground] ```