The **SS21V-R200036** is a common mode choke (inductor) manufactured by KEMET (formerly NEC TOKIN). It belongs to the **SS21V Series**, which is designed for noise suppression in power supply circuits. --- ### 1. Key Technical Specifications The model number encodes specific electrical characteristics. Here is the breakdown: | Parameter | Value / Description | | :--- | :--- | | **Series** | SS21V (Vertical Type) | | **Rated Current** | 2.0 Amperes (AC/DC) | | **Inductance (min)** | 3.6 mH | | **DC Resistance (max)** | 0.150 Ω | | **Rated Voltage** | 250 VAC | | **Insulation Resistance** | 100 MΩ minimum (at 500 VDC) | | **Operating Temp** | -25°C to +120°C | --- ### 2. Core Components and Design * **Core Material:** This part utilizes a high-permeability **Ferrite Core** (S15H material). This material is optimized for high-frequency noise attenuation. * **Winding Style:** It features a dual-winding configuration on a single core. The windings are arranged so that common-mode signals (noise) encounter high impedance, while differential-mode signals (intended power) encounter low impedance. * **Mechanical Structure:** * **Vertical Mount:** The "V" in SS21V indicates a vertical orientation, which saves PCB real estate. * **Separated Bobbin:** The bobbin is split into two sections to ensure high dielectric strength between the two coils. --- ### 3. Applications The SS21V-R200036 is primarily used as an **EMI (Electromagnetic Interference) Filter**. Common applications include: 1. **Switching Power Supplies:** Suppressing noise generated by high-frequency switching transistors. 2. **AC Adapters:** Ensuring consumer electronics comply with FCC or CE noise emission standards. 3. **Household Appliances:** Used in washing machines, air conditioners, and TVs to protect sensitive internal logic from line noise. 4. **Office Equipment:** Filtering noise in printers and photocopiers. --- ### 4. Circuit Symbol and Functionality In a circuit diagram, it is represented as two coupled inductors on a single core: ```text Line In o---( Coil 1 )---o Line Out ) ) Neutral o---( Coil 2 )---o Neutral Out ``` * **Common Mode Suppression:** It blocks noise that travels in the same direction on both lines (Phase and Neutral). * **Low Power Loss:** Due to the low DC resistance (150mΩ), it manages 2 Amps of current with minimal heat dissipation. ---