The term **1A15-R2** most frequently refers to a specific type of **Low-Profile Power Inductor** or a surface-mount component used in voltage regulation. Below is a detailed breakdown of its characteristics, functions, and technical specifications. --- ## 1. Component Overview The 1A15-R2 is typically a **Shielded Drum Core Inductor**. These parts are designed for high-density power applications where space is limited and electromagnetic interference (EMI) must be kept to a minimum. ### Technical Specifications | Feature | Typical Value | | :--- | :--- | | **Inductance** | 0.20 µH to 0.22 µH (indicated by "R2") | | **Tolerance** | ±20% | | **Current Rating (Isat)** | ~1.0A to 1.5A (varies by manufacturer) | | **DC Resistance (DCR)** | Low (typically < 50 mΩ) | | **Package Size** | 1A15 (approx. 1.5mm x 1.0mm footprint) | | **Mounting Type** | SMD/SMT (Surface Mount) | --- ## 2. Key Internal Parts An inductor like the 1A15-R2 is composed of three primary elements: 1. **Magnetic Core:** Usually made of Ferrite or Metal Composite material. This stores the energy in a magnetic field. 2. **Copper Wire (Winding):** A fine enamelled copper wire wrapped around the core. The number of turns determines the inductance. 3. **Magnetic Shielding:** A specialized coating or casing that prevents the magnetic flux from leaking out, which protects nearby sensitive components on the PCB. --- ## 3. Applications These components are essential in modern electronics for managing power efficiency. * **DC-DC Converters:** Used in "Buck" or "Boost" converters to step voltage up or down. * **Mobile Devices:** Found in smartphones and tablets due to the ultra-low profile height. * **Noise Filtering:** Acts as a low-pass filter to smooth out ripples in high-speed switching power supplies. --- ## 4. Part Number Decoding In the electronics industry, part numbers often follow a logical naming convention: * **1A15:** Refers to the physical dimensions (Case Size). * **R2:** Refers to the inductance value. In the "R" notation: * `R` acts as a decimal point. * `R2` = 0.2 (usually 0.2µH or 0.22µH depending on the specific series). * If it were `2R2`, it would be 2.2µH. ---