The part number **1P5-R** typically refers to a **Surface Mount Device (SMD) Power Inductor**. These components are essential in power management circuits, particularly for DC-DC converters and voltage regulation modules. Below is a detailed breakdown of its characteristics and technical specifications. --- ### 1. Component Overview The "1P5" nomenclature usually represents the inductance value, where "P" acts as a decimal point. Therefore, **1P5 = 1.5 microhenries (µH)**. The "-R" suffix often indicates "RoHS compliant" or refers to a specific taping/packaging style (Reel). ### 2. Technical Specifications While exact specs vary by manufacturer (such as Eaton, Coilcraft, or Sumida), a standard 1P5-R inductor generally follows these parameters: | Feature | Description | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | Usually ±20% (M) | | **Core Material** | Ferrite or Metal Powder | | **Shielding** | Often Magnetically Shielded (to reduce EMI) | | **Operating Temp** | -40°C to +125°C (Standard range) | | **Mounting Type** | Surface Mount (SMD/SMT) | ### 3. Key Functions in a Circuit Inductors like the 1P5-R serve three primary roles: 1. **Energy Storage:** They store energy in a magnetic field during the switching cycle of a power supply. 2. **Filtering:** They work with capacitors to smooth out voltage ripples and reduce high-frequency noise. 3. **Current Regulation:** They resist sudden changes in current, protecting sensitive downstream components. ### 4. Common Applications * **Smartphones & Tablets:** Used in high-efficiency power stages for processors. * **DC-DC Converters:** Buck, Boost, and Buck-Boost regulators. * **LED Drivers:** Providing constant current for lighting applications. * **Computer Peripherals:** Found on motherboards and GPU power phases. --- ### 5. Identification Example If you are looking at a specific series (e.g., the **Eaton SD series**), the code breakdown looks like this: ```text Example: SD12-1P5-R - SD: Series Name (Shielded Drum) - 12: Physical size (e.g., 5.2mm x 5.2mm x 1.2mm) - 1P5: Inductance Value (1.5 µH) - R: RoHS Compliant ```