The part number **105B-R** typically refers to a **High-Frequency/Standard Surface Mount (SMD) Power Inductor**, often associated with manufacturers like *Eaton (Bussmann/Coiltronics)* or generic passive component suppliers. Below is a detailed breakdown of the technical specifications, nomenclature, and applications for this component. --- ## 1. Component Identification In the electronics industry, "105" is a standard code for inductance value, while "B" and "R" denote physical size/tolerance and RoHS compliance, respectively. ### Technical Specifications Table | Feature | Typical Specification | | :--- | :--- | | **Inductance Value** | 1.0 µH (Microhenries) | | **Tolerance** | ±20% (Standard) | | **Current Rating (Isat)** | ~4.0A to 6.0A (Varies by case size) | | **DC Resistance (DCR)** | Low (approx. 10mΩ - 30mΩ) | | **Operating Temp** | -40°C to +125°C | | **Compliance** | RoHS / Lead-Free (indicated by 'R') | --- ## 2. Deciphering the Part Number The alphanumeric string follows a standard convention used in power magnetism: ### **105** (Value Code) This follows the three-digit EIA system: * **10**: The first two significant digits. * **5**: The multiplier ($10^5$ in nanohenries). * **Calculation**: $10 \times 10^5$ nH = $1,000,000$ nH = **1.0 µH**. ### **B** (Case Size/Series) The "B" usually refers to a specific physical dimension (e.g., 5mm x 5mm or 10mm x 10mm depending on the manufacturer’s series catalog). ### **R** (Compliance) Standard suffix for **RoHS Compliant**. This indicates the part is manufactured without hazardous substances like lead or mercury. --- ## 3. Physical Construction The 105B-R is generally a **Shielded Drum Core Inductor**. * **Core Material:** Ferrite. * **Shielding:** Magnetic shielding reduces Electromagnetic Interference (EMI) with neighboring components. * **Mounting:** SMD (Surface Mount Device) with solder pads on the bottom. --- ## 4. Common Applications Due to its high current handling and low resistance, this part is used in: 1. **DC-DC Converters:** Buck or boost regulators in laptops and tablets. 2. **Power Supplies:** Filtering noise in switched-mode power supplies (SMPS). 3. **LED Drivers:** Managing current flow for high-brightness LEDs. 4. **Audio Equipment:** Output filters for Class-D amplifiers. ---