The part number **11003-R** typically refers to a specialized electronic component, most commonly identified as a **High-Frequency Power Inductor** or a **Surface Mount (SMD) Power Choke**, often manufactured by companies like *Delevan* or found in specific automotive/industrial catalogs. Below is a detailed breakdown of the technical specifications and characteristics typical for this component series. --- ## 1. Technical Specifications While exact specs can vary slightly by manufacturer (e.g., API Delevan vs. generic series), the "11003" series generally follows these parameters: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Inductance** | 0.010 to 0.100 (Model dependent) | µH | | **Tolerance** | ±10% or ±20% | % | | **Current Rating (DC)** | 1.5 - 3.0 | Amps | | **DC Resistance (DCR)** | 0.01 - 0.05 | Ohms (Max) | | **Operating Temp** | -55 to +125 | °C | | **Package Type** | Surface Mount (SMD) | - | --- ## 2. Key Features * **High Q Factor:** Designed for high-frequency stability and low loss. * **Miniature Footprint:** Small form factor intended for high-density PCB layouts. * **Suffix "-R":** In the electronics industry, the suffix **-R** almost always denotes **RoHS Compliance** (Restriction of Hazardous Substances), meaning the part is lead-free. * **Shielding:** Many 11003-R variants are unshielded, though some high-spec versions feature magnetic shielding to reduce EMI. --- ## 3. Common Applications These parts are integral to power management and signal processing: 1. **DC-DC Converters:** Used for energy storage and filtering in voltage regulator modules. 2. **RF Filtering:** Utilized in radio frequency circuits to block high-frequency noise while allowing DC to pass. 3. **Decoupling:** Used in power lines to prevent noise from interfering with sensitive integrated circuits (ICs). 4. **Automotive Electronics:** Often found in ECU (Engine Control Unit) modules due to their high-temperature resilience. --- ## 4. Visual/Mechanical Identification * **Body Material:** Usually a phenolic or ferrite core. * **Terminations:** Solder-plated copper or silver-based terminations for SMD mounting. * **Marking:** Often marked with a 3-digit code (e.g., "100" for 10µH) or left blank if the size is sub-miniature.