The **SS21VB-R110041** is a high-performance common mode choke coil (inductor) primarily manufactured by **KEMET**. It is designed for noise suppression in power supply circuits, specifically to filter out electromagnetic interference (EMI). --- ## 1. Technical Specifications The following table outlines the primary electrical and physical characteristics of the component: | Property | Value/Specification | | :--- | :--- | | **Component Type** | Common Mode Choke | | **Inductance (Min)** | 4.1 mH | | **Rated Current (AC)** | 1.1 A | | **Rated Voltage (AC)** | 250 VAC | | **DC Resistance (Max)** | 350 mΩ | | **Temperature Rise** | 45 K (Max) | | **Operating Temp Range** | -25°C to +120°C | | **Mounting Type** | Through-Hole (Vertical) | --- ## 2. Key Features and Design * **High Permeability Core:** Utilizes proprietary ferrite cores that provide high impedance at specific frequency ranges to effectively cancel out noise. * **Vertical Orientation:** The "V" in the series name denotes a vertical mounting style, which helps save PCB (Printed Circuit Board) real estate. * **Dual Winding:** It consists of two coils wound on a single core. The magnetic fields generated by the differential currents cancel each other out, while the common-mode noise sees high impedance. * **Safety Standards:** Built to meet various global safety requirements for power line applications. --- ## 3. Common Applications This part is typically found in the input stage of power electronics to ensure compliance with EMI/EMC regulations. 1. **Switching Mode Power Supplies (SMPS):** Used to prevent high-frequency switching noise from leaking back into the AC mains. 2. **Consumer Electronics:** Found in LED lighting drivers, televisions, and audio equipment. 3. **Industrial Equipment:** Used in motor controllers and power converters. 4. **Office Automation:** Integrated into printers and photocopiers. --- ## 4. Part Number Breakdown While manufacturer coding varies slightly, the SS21VB series generally follows this logic: * **SS:** Series name (KEMET/Tokin) * **21:** Core size/Form factor * **V:** Vertical mounting type (B = Standard bobbin) * **R11:** Rated current (1.1 Amperes) * **0041:** Inductance value (4.1 mH)