The part number **15111-R** typically refers to a high-performance **Surface Mount Device (SMD) Power Inductor**, often manufactured by companies like **Vishay**, **Bourns**, or specialty magnetic component suppliers. Below is a breakdown of its technical characteristics and functions. --- ### 1. Component Specifications While exact specs can vary by manufacturer series (e.g., Vishay IHLP or specific automotive series), the "-R" suffix usually denotes **RoHS Compliance** or a specific **Reel** packaging format. | Parameter | typical Description | | :--- | :--- | | **Component Type** | Fixed Power Inductor | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Inductance Range** | Usually 0.1µH to 10µH (Design dependent) | | **Shielding** | Shielded (Molded construction to reduce EMI) | | **Tolerance** | ±20% (Standard for power inductors) | | **Material** | Composite powdered iron or ferrite core | --- ### 2. Key Features * **High Current Capability:** Designed to handle high transient current spikes without saturation. * **Low DCR (Direct Current Resistance):** Minimizes energy loss as heat, improving the efficiency of the power supply. * **Thermal Stability:** These parts are often rated for high-temperature environments (up to 125°C or 155°C), making them suitable for automotive or industrial use. * **Magnetic Shielding:** The molded construction minimizes electromagnetic interference (EMI) with surrounding components on the PCB. --- ### 3. Common Applications The 15111-R series is primarily used in DC/DC converter circuits. 1. **Voltage Regulator Modules (VRM):** Used in laptops and desktop motherboards to step down voltage for CPUs. 2. **Automotive Electronics:** Powering infotainment systems, ADAS sensors, and LED lighting drivers. 3. **Telecom Infrastructure:** Distributed power systems and base stations. 4. **Battery Powered Devices:** High-efficiency power management for handheld tools and portable electronics. --- ### 4. Identification Example If the part is from a specific series (like the Vishay IHLP), the numbering usually follows this logic: ```text 15111-R | | | +-- RoHS Compliant / Lead-Free +-------- Part Family / Size Code ``` ---