The **LF2020BNP-R362** is a high-performance **Common Mode Choke Coil** (Inductor) manufactured by Sumida. These components are primarily used in power supply circuits to suppress electromagnetic interference (EMI) and noise. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of this specific part: | Parameter | Specification | | :--- | :--- | | **Inductance (Min)** | 3.6 mH | | **Rated Current (AC)** | 2.0 A | | **DC Resistance (Max)** | 0.15 Ω | | **Mounting Type** | Through-Hole (Vertical) | | **Operating Temp Range** | -40°C to +105°C | | **Core Material** | Ferrite | --- ### 2. Structural Composition The LF2020 series features a specific design architecture: * **Core:** High-permeability ferrite core (typically Mn-Zn) optimized for low-frequency noise suppression. * **Bobbins:** Uses a 4-pin vertical bobbin structure, which saves PCB real estate compared to horizontal versions. * **Winding:** Two coils are wound on a single core. The magnetic fields generated by the supply and return currents cancel each other out for the differential signal but provide high impedance for common-mode noise. --- ### 3. Key Functions & Applications The LF2020BNP-R362 is designed for AC line filters where high current handling and noise reduction are critical. #### Primary Functions: * **Noise Suppression:** Filters out high-frequency noise coming from the power grid or generated by the device itself (Switching Noise). * **EMI Compliance:** Helps electronic products meet regulatory standards (like FCC or CISPR) by reducing conducted emissions. #### Common Applications: 1. **Switching Power Supplies (SMPS):** Used at the AC input stage. 2. **LED Lighting Drivers:** Prevents flicker and electromagnetic interference. 3. **Home Appliances:** Integrated into washing machines, air conditioners, and refrigerators. 4. **Adapters:** Power bricks for laptops and monitors. --- ### 4. Part Number Breakdown * **LF:** Series Name (Line Filter). * **2020:** Physical dimensions/frame size (approx. 20mm x 20mm). * **BNP:** Bobbin and pin configuration style (Vertical, Through-hole). * **R362:** Indicates the inductance value (362 = 3.6mH). ---