The **SS30V-R120380** is a high-performance common mode choke coil (inductor) typically manufactured by **KEMET**. These components are specifically designed for noise suppression in power supply circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Series** | SS30V (Vertical High Power) | | **Rated Current** | 1.2 Amperes (indicated by '120') | | **Inductance (Min)** | 38.0 mH (indicated by '380') | | **Rated Voltage** | 250 VAC / VDC | | **DCR (Direct Current Resistance)** | Max 0.55 $\Omega$ per line | | **Temperature Range** | -25°C to +120°C | --- ### 2. Physical Characteristics * **Mounting Type:** Through-hole (Vertical orientation). * **Core Material:** Ferrite (high permeability). * **Winding:** Dual winding on a single core to counteract common-mode noise. * **Dimensions:** Approximately 32mm x 21mm x 38mm (Large frame for high inductance). --- ### 3. Key Electronic Functions The SS30V-R120380 serves three primary roles in an electronic circuit: 1. **EMI Suppression:** It acts as a low-pass filter to block high-frequency Electromagnetic Interference (EMI) from escaping a power supply or entering sensitive equipment. 2. **Common Mode Filtering:** It targets noise that is present on both the Line and Neutral wires simultaneously, while allowing the desired differential current (the actual power) to pass through unaffected. 3. **High Impedance:** With an inductance of 38mH, it provides a very high impedance against noise in the kHz to MHz range, which is common in switching power supplies. --- ### 4. Typical Applications These parts are commonly found in the input stage of power electronics: * **AC/DC Adapters:** Filtering the mains input. * **Switching Mode Power Supplies (SMPS):** Reducing switching noise. * **Industrial Equipment:** Protecting delicate logic circuits from industrial grid noise. * **Consumer Electronics:** Televisions and large appliances.