The **SS17HB-R03300** is a common mode choke coil (inductor) typically used in noise suppression and electromagnetic interference (EMI) filtering. It is part of the SS series manufactured by companies like KEMET (formerly TOKIN). --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the SS17HB-R03300: | Parameter | Specification | |:---|:---| | **Component Type** | Common Mode Choke | | **Inductance (Min)** | 30.0 mH | | **Rated Current (AC/DC)** | 0.3 A (300 mA) | | **DC Resistance (Max)** | 2.5 Ω | | **Rated Voltage** | 250 VAC | | **Temperature Rise (Max)** | 45 K | | **Operating Temperature** | -25°C to +120°C | | **Core Material** | Manganese-Zinc (Mn-Zn) Ferrite | --- ### 2. Key Features * **High Inductance:** Provides significant impedance against common mode noise at relatively low frequencies. * **Compact Design:** The "17HB" designation refers to the physical size and vertical mounting style, making it ideal for high-density PCB layouts. * **Reliability:** Designed to handle AC line voltages (up to 250V), making it suitable for direct integration into power supply inputs. * **Low Profile:** The "HB" series usually indicates a specific bobbin orientation that minimizes the footprint area. --- ### 3. Internal Structure & Working Principle The device consists of two coils wound onto a single ferrite core. * **Differential Mode:** When current flows in opposite directions (normal operation), the magnetic fields cancel out, allowing the signal to pass with minimal resistance. * **Common Mode:** When noise flows in the same direction on both lines, the magnetic fields add up, creating high impedance and effectively "choking" the noise before it reaches sensitive components. --- ### 4. Common Applications The SS17HB-R03300 is primarily used in the following sectors: 1. **Switching Power Supplies (SMPS):** Filtering AC line noise. 2. **LED Lighting:** Preventing high-frequency switching noise from entering the power grid. 3. **Consumer Electronics:** Used in TVs, Audio equipment, and PC peripherals to comply with EMC regulations. 4. **Home Appliances:** Reducing interference in motor controllers or digital displays. ---