The **CTSFW1890F-R82M** is a high-performance, shielded power inductor typically used in DC-DC converter applications. Below is a detailed breakdown of its technical specifications and characteristics. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical properties: | Component Segment | Meaning | | :--- | :--- | | **CTSFW** | Series designation (typically shielded, flat wire construction) | | **1890** | Case size (approx. 18mm x 18mm x 9mm) | | **F** | Lead-free / RoHS compliant | | **R82** | Inductance value: 0.82 µH | | **M** | Tolerance: ±20% | --- ### 2. Technical Specifications The "R82M" indicates a low inductance value, which is common in high-frequency switching power supplies. | Parameter | Value (Typical) | | :--- | :--- | | **Inductance** | 0.82 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | Extremely low (mΩ range) | | **Saturation Current (Isat)** | Very High (often >40A) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Shielded, Flat Wire | --- ### 3. Key Electronic Characteristics #### A. Shielded Construction The inductor is magnetically shielded. This minimizes **Electromagnetic Interference (EMI)**, ensuring that the magnetic field stays contained within the core. This is critical for dense PCB layouts where components are placed close together. #### B. Flat Wire Technology Instead of standard round copper wire, this part uses **flat wire**. This offers several advantages: * **Lower DCR:** Larger surface area reduces resistance, leading to less heat generation. * **Better Fill Factor:** Allows for a smaller physical footprint while maintaining high current capacity. * **Skin Effect Mitigation:** Performs better at high frequencies compared to standard wire. #### C. High Saturation Current The "R82M" version is designed to handle massive spikes in current without the inductance dropping significantly (saturation). This makes it ideal for "Point of Load" (POL) converters. --- ### 4. Common Applications * **Voltage Regulator Modules (VRMs):** Used in servers and high-end workstations. * **DC-DC Converters:** High-efficiency power supplies for industrial electronics. * **Automotive Systems:** Powering infotainment or ADAS modules where EMI control is vital. * **Battery Powered Systems:** Where low DCR is required to maximize battery life. --- ### 5. Footprint (SMD) This is a **Surface Mount Device (SMD)**. Designers must ensure that the solder pads are large enough to dissipate the heat generated by high current loads.