The **SCIH1040HC-R19N** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-efficiency power supplies. It belongs to a category of "molded" inductors designed for high reliability and low electromagnetic interference (EMI). --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Inductance** | 0.19 µH (Microhenries) | | **Tolerance** | ±20% (Standard for R19N series) | | **DCR (Direct Current Resistance)** | Extremely low (typically < 1.0 mΩ) | | **Isat (Saturation Current)** | Very High (often 40A - 60A range) | | **Irms (Rated Current)** | High thermal current capacity | | **Package Size** | ~11.5mm x 10.3mm x 4.0mm (1040 Series) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Key Internal Components The construction of this part is what gives it its specific performance profile: * **Composite Powder Core:** The inductor is made by pressing a specialized iron powder around the copper coil. This "molded" construction allows for soft saturation (the inductance doesn't drop off instantly when current increases). * **Flat Wire Technology:** It likely utilizes flat copper wire rather than round wire. This increases the surface area, reducing the **Skin Effect** and allowing for lower DCR, which translates to less heat during operation. * **Magnetic Shielding:** Because the core material surrounds the entire coil, the component is inherently shielded. This prevents magnetic flux from leaking and interfering with nearby sensitive components on the PCB. --- ### 3. Part Number Breakdown The nomenclature typically follows this logic: | Segment | Meaning | | :--- | :--- | | **SCIH** | Series identifier (High Current Inductor) | | **1040** | Physical dimensions (approx. 10mm x 10mm x 4.0mm) | | **HC** | High Current capability designation | | **R19** | Inductance value (R = decimal point), so 0.19 µH | | **N** | Tolerance or specific material grade | --- ### 4. Typical Applications Due to its low inductance (0.19 µH) and high current handling, it is used in: * **Voltage Regulator Modules (VRMs):** Found in CPU and GPU power delivery. * **Point of Load (POL) Converters:** High-speed switching power supplies. * **Automotive Electronics:** Powering infotainment or ADAS systems. * **Servers:** High-density power distribution units. ---