The **SRP0412-R68K** is a high-power, surface-mount (SMD) inductor belonging to the **SRP0412 series**, typically manufactured by **Bourns**. It is designed for high-current power supplies and DC/DC converters where efficiency and high saturation current are critical. --- ### 1. Technical Specifications The alphanumeric code `R68K` provides the primary electrical characteristics of the component. | Parameter | Specification | Description | | :--- | :--- | :--- | | **Inductance** | 0.68 µH | The "R68" signifies 0.68 microhenries. | | **Tolerance** | ±10% | The "K" suffix indicates the tolerance level. | | **DC Resistance (DCR)** | ~18-22 mΩ | The resistance of the wire inside; lower is better for efficiency. | | **Irms (Heating Current)** | ~7.0 - 8.5 A | The current that causes a 40°C temperature rise. | | **Isat (Saturation Current)** | ~9.0 - 11.0 A | The current at which inductance drops by 30%. | | **Operating Temp** | -40 to +125 °C | Includes self-heating. | --- ### 2. Physical Characteristics The part is housed in a molded powder iron core construction, which offers superior shielding and high saturation levels compared to traditional ferrite cores. * **Dimensions:** The "0412" designation generally refers to the footprint size. * **Width/Length:** Approx. 4.0 mm x 4.0 mm. * **Height:** Approx. 1.2 mm (low profile). * **Construction:** Metal alloy powder core. This design minimizes "buzz" noise (acoustic noise) and provides a soft saturation characteristic. --- ### 3. Key Features and Applications #### Features: * **Shielded Construction:** Low magnetic radiation, making it suitable for high-density boards. * **High Saturation Current:** It can handle high current spikes without the inductance collapsing. * **Lead-Free/RoHS Compliant:** Standard for modern electronic manufacturing. #### Common Applications: 1. **DC/DC Converters:** Used in voltage regulator modules (VRMs). 2. **Portable Electronics:** Smartphones, tablets, and laptops due to the low profile. 3. **Power Supplies:** Specifically for distributed power systems and FPGA/Microprocessor power rails. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **SRP** | Series Name (High Current Power Inductor) | | **0412** | Size Dimensions (4.4 x 4.0 x 1.2 mm) | | **R68** | Inductance Value (R = Decimal point; 0.68 µH) | | **K** | Tolerance (K = ±10%, M = ±20%) |