The **CTSFW1350F-R19M** is a high-current, shielded power inductor typically used in DC-DC converters and high-density power modules. This component belongs to the family of **Molded Power Inductors**, which are known for their ability to handle high saturation currents in a compact footprint. --- ### 1. Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 0.19 µH (0.19 microhenries) | | **Tolerance** | ±20% (indicated by the "M") | | **Case Size** | 1350 (approx. 13.5mm x 12.5mm) | | **Max DC Resistance (DCR)** | Extremely Low (typically < 1.0 mΩ) | | **Saturation Current (Isat)** | Very High (often exceeding 50A - 80A) | | **Core Material** | Composite Magnetic Iron Powder | | **Shielding** | Magnetically Shielded (Molded construction) | --- ### 2. Breakdown of the Part Number * **CTSFW**: Product Series (High current, molded surface mount inductor). * **1350**: Dimensions. The "13" represents a length/width of approx 13mm, and "50" usually indicates a height of approx 5.0mm. * **R19**: The Inductance value. "R" acts as a decimal point, so R19 = **0.19 µH**. * **M**: Tolerance code. M stands for **±20%**. --- ### 3. Key Electronic Characteristics #### A. Molded Construction Unlike traditional wire-wound inductors with a ferrite drum core, this part is "molded." The coil is placed inside a mold and pressed with metallic magnetic powder. * **Benefit:** This creates a solid structure that is highly resistant to mechanical shock and vibration. * **Acoustic Noise:** Reduces "buzzing" (magnetostriction) compared to standard inductors. #### B. Soft Saturation Because it uses iron powder composite, the inductance does not "drop off a cliff" when the current exceeds the limit. Instead, it follows a gentle curve (soft saturation), which provides better safety margins in power supply designs. #### C. Magnetic Shielding The molded body acts as a natural shield, minimizing Electromagnetic Interference (EMI) with surrounding components on the PCB. --- ### 4. Common Applications Due to its very low inductance (0.19 µH) and high current capability, this part is used in: * **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power delivery. * **High-speed Switch Mode Power Supplies (SMPS):** Where high switching frequencies are used. * **Servers and Data Centers:** For high-efficiency point-of-load converters. ---