The **SS11VL-R08125** is a high-performance common mode choke coil (inductor) manufactured by KEMET. It is primarily used in power supply circuits to suppress electromagnetic interference (EMI) and noise. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Series** | SS11VL (Vertical Type) | | **Rated Current** | 0.8 Amperes (A) | | **Inductance (Min)** | 12.5 mH | | **DC Resistance (Max)** | 0.85 $\Omega$ per line | | **Temperature Rise** | 45 K (Maximum) | | **Operating Temp Range** | -25°C to +120°C | | **Voltage Rating** | 250 VAC / VDC | --- ### 2. Key Features * **High Permeability Core:** Utilizes a proprietary ferrite core material that provides high impedance at low frequencies, making it effective at filtering line noise. * **Vertical Mount Design:** The "VL" designation indicates a vertical orientation, which saves significant PCB (Printed Circuit Board) real estate. * **Dual Winding:** It consists of two coils wound on a single core, designed to cancel out common-mode noise while allowing differential-mode signals to pass. --- ### 3. Common Applications This component is typically found in the input stage of power electronics to comply with EMI/EMC regulations (such as FCC or CISPR). 1. **Switch Mode Power Supplies (SMPS):** Filters high-frequency switching noise. 2. **LED Lighting Drivers:** Prevents electrical noise from entering the AC mains. 3. **Consumer Electronics:** Used in adapters for laptops, televisions, and audio equipment. 4. **Industrial Equipment:** Protects sensitive control circuits from line interference. --- ### 4. Typical Internal Circuit The SS11VL series is a 4-pin device. The wiring is usually structured as follows: ```text Pin 1 (Input L) ----[ Coil A ]---- Pin 4 (Output L) Pin 2 (Input N) ----[ Coil B ]---- Pin 3 (Output N) ``` *Note: The magnetic fields generated by the load current cancel each other out, while noise signals flowing in the same direction across both lines are blocked by high impedance.*