The **SS21V-R080200** is a high-performance, compact common mode choke coil (inductor) primarily manufactured by **KEMET** (formerly NEC/Tokin). It belongs to the SS series, which is designed for noise suppression in power supply circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Parameter | Value / Specification | |:---|:---| | **Rated Current** | 0.8 Amperes (800mA) | | **Inductance (Min)** | 20.0 mH (Millihenries) | | **DC Resistance (Max)** | 0.60 $\Omega$ | | **Rated Voltage** | 250 VAC / 300 VDC | | **Temperature Rise** | 45 K (Max) | | **Operating Temp Range** | -25°C to +120°C | --- ### 2. Core Features & Construction * **Core Material:** High-permeability Ferrite core (typically S15H or similar). * **Structure:** Vertical mount configuration. The "V" in the part number indicates a vertical orientation, which saves valuable PCB real estate. * **Bobbin Design:** Features a divided bobbin structure. This separation helps reduce parasitic capacitance between the windings, resulting in better high-frequency performance. * **High Impedance:** Designed to provide high impedance across a wide frequency range to effectively block Electromagnetic Interference (EMI). --- ### 3. Applications The SS21V series is commonly found in the input filter stage of power electronics to comply with EMI/EMC regulations (like CISPR or FCC). * **Switch Mode Power Supplies (SMPS):** Used to prevent switching noise from leaking back into the AC power line. * **Consumer Electronics:** Found in LED lighting drivers, televisions, and audio equipment. * **Industrial Equipment:** Used in motor controllers and various power distribution units. * **Office Automation:** Used in printers, copiers, and computing power bricks. --- ### 4. Part Number Breakdown (SS21V-R080200) | Code | Meaning | |:---|:---| | **SS** | Series name (Small Size Choke) | | **21** | Physical dimensions/frame size | | **V** | Vertical mount type | | **R** | RoHS compliant / High permeability series | | **08** | Rated Current (0.8 Amps) | | **0200** | Inductance value (20.0 mH) |