The **SRP6540-R82M** is a high-current, shielded power inductor manufactured by **Bourns**. It belongs to the SRP6540 series, which is designed for high-density power applications that require high reliability and low electromagnetic interference (EMI). --- ### 1. Key Technical Specifications The model number encodes specific parameters of the component. Below is the breakdown: | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.82 µH | The nominal inductance value. | | **Tolerance** | ±20% (M) | The allowable variance from nominal inductance. | | **Inductance Code** | R82 | "R" acts as a decimal point (0.82). | | **Saturation Current ($I_{sat}$)** | ~24 A | The current at which inductance drops by 30%. | | **Heating Current ($I_{rms}$)** | ~16 A | The current that causes a 40°C temperature rise. | | **DCR (Resistance)** | ~3.8 mΩ | The internal DC resistance (Max value). | | **Operating Temp** | -40 to +150°C | Includes self-heating temperature rise. | --- ### 2. Design and Construction The SRP6540-R82M is built using specialized materials to handle high power in a small footprint: * **Shielded Construction:** The inductor uses a carbonyl powder core. This design minimizes "leakage flux," which reduces electromagnetic interference (EMI) that could affect nearby components on a PCB. * **Molded Core:** The wire is embedded directly into the metal powder core under high pressure. This makes the component highly resistant to mechanical vibration and acoustic noise (buzzing). * **Flat Wire/Lead-frame:** Many inductors in this series use flat wire technology to maximize the surface area, which significantly lowers the DC Resistance (DCR) and improves thermal efficiency. --- ### 3. Footprint and Dimensions The "6540" in the part number refers to the physical dimensions of the SMD (Surface Mount Device) package: | Dimension | Measurement (mm) | | :--- | :--- | | **Length** | 7.2 mm (approx.) | | **Width** | 6.5 mm (approx.) | | **Height** | 4.0 mm (max) | --- ### 4. Typical Applications Because of its high current handling and low EMI, the SRP6540-R82M is commonly found in: 1. **DC/DC Converters:** Used in buck, boost, or SEPIC topologies. 2. **GPU/CPU Power:** Providing stable current to high-performance processors. 3. **Automotive Electronics:** Driver assistance systems and infotainment (AEC-Q200 versions often available). 4. **Industrial Power Supplies:** Where space is limited but power requirements are high.