## Technical Overview of LF2628NP-R753 The **LF2628NP-R753** is a high-performance **Common Mode Choke** (inductor) primarily used for EMI (Electromagnetic Interference) suppression in AC power lines. It is part of the LF series manufactured by companies like **Sumida**. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Component Type** | Common Mode Choke / Filter | | **Inductance (Min)** | 75 mH (Millihenries) | | **Rated Current** | Approximately 0.3A - 0.5A (Typical for this series) | | **Inductance Tolerance** | Typically +50% / -30% | | **Mounting Type** | Through-Hole (THT) | | **Case Style** | Vertical / NP (Non-Polarized) | --- ### 2. Core Functionality The LF2628NP-R753 acts as a low-pass filter. Its internal construction consists of two coils wound on a single ferrite core. * **Common Mode Rejection:** It allows "Differential Mode" signals (the power you want) to pass while providing high impedance to "Common Mode" noise (unwanted interference). * **EMI Suppression:** It prevents noise generated by a switching power supply from leaking back into the main AC grid and protects the device from external line noise. --- ### 3. Structural Design The "2628" designation usually refers to the physical dimensions of the core or the footprint. * **Core Material:** High-permeability Ferrite. * **Configuration:** 4-pin layout (2 inputs, 2 outputs). * **Vertical Orientation:** Saves PCB real estate (footprint) by utilizing vertical height. --- ### 4. Applications This specific part is commonly found in low-power consumer electronics and industrial power systems, including: 1. **Switch Mode Power Supplies (SMPS):** The primary use case. 2. **LED Drivers:** Reducing flicker and noise. 3. **AC Adapters:** For laptops and small appliances. 4. **Audio Equipment:** Eliminating "hum" from power lines. --- ### 5. Identification (Part Number Breakdown) * **LF:** Line Filter series. * **2628:** Size/Series code (approx. 26mm x 28mm dimension footprint). * **NP:** Package type (often refers to a specific lead-free or vertical mounting style). * **R753:** Inductance value. The "753" translates to $75 \times 10^3$ $\mu H$, which equals **75 mH**.