The **SRP8540A-R33M** is a high-current, shielded power inductor manufactured by **Bourns**. It is designed primarily for use in DC/DC converters and power supplies where high reliability and efficiency are required. ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.33 µH | | **Tolerance** | ±20% | | **Saturation Current ($I_{sat}$)** | 48 Amps (Typical) | | **Heating Current ($I_{rms}$)** | 28 Amps (Typical) | | **DCR (DC Resistance)** | 1.1 mΩ (Max) | | **Operating Temperature** | -40 °C to +150 °C | | **Self-Resonant Frequency** | 100 MHz | --- ### 2. Physical Characteristics The "8540" in the part number refers to the physical dimensions of the component. * **Construction:** Metal alloy powder core. This molded construction provides magnetic shielding and minimizes "buzz" noise. * **Dimensions:** * **Length:** 8.8 mm * **Width:** 8.0 mm * **Height:** 3.8 mm * **Terminations:** Lead-free (RoHS compliant) tinned copper. --- ### 3. Core Features and Benefits The SRP8540A series is distinct due to its high-performance profile: 1. **Shielded Construction:** The molded design encapsulates the winding, resulting in very low magnetic field radiation (low EMI). 2. **High Saturation:** Unlike ferrite inductors that drop inductance sharply, this metal alloy powder core has a "soft" saturation characteristic. 3. **High Temperature Range:** It is AEC-Q200 qualified, meaning it is tested for automotive-grade durability and can withstand temperatures up to 150°C. 4. **Low DCR:** The very low DC resistance (1.1 mΩ) minimizes power loss due to heat, significantly increasing the efficiency of the power stage. --- ### 4. Common Applications Due to its high current handling and compact size, it is commonly found in: * **Automotive Electronics:** Driver assistance systems, infotainment, and lighting. * **Computing:** High-current DC/DC converters for CPUs and GPUs (Voltage Regulator Modules). * **Industrial:** High-density power supplies and battery-powered devices.