The **CSBL1809-R82M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and power management modules. This part is characterized by its compact molded construction, which offers excellent magnetic shielding and high reliability. --- ### 1. Key Technical Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.82 µH | The nominal inductance at 100kHz. | | **Tolerance** | ±20% (M) | The allowable variance in inductance. | | **Rated Current (Irms)** | ~13.0A - 15.0A | The current that causes a 40°C temperature rise. | | **Saturation Current (Isat)** | ~22.0A - 25.0A | The current at which inductance drops by 30%. | | **DC Resistance (DCR)** | ~4.5 - 5.5 mΩ | Internal resistance (Maximum value). | | **Package Size** | 1809 | Dimensions approx. 5.2 x 4.8 x 2.3 mm. | --- ### 2. Physical & Material Characteristics * **Molded Structure:** The inductor is made by pressing metal alloy powder around the copper coil. This "molded" design eliminates the humming noise (acoustic noise) often found in traditional ferrite inductors. * **Magnetic Shielding:** Because the magnetic material surrounds the coil entirely, it has very low EMI (Electromagnetic Interference) leakage, making it ideal for high-density circuit boards. * **Core Material:** Usually a Carbonyl Iron or Metal Alloy powder, which provides "soft saturation" characteristics (inductance drops gradually rather than abruptly when current increases). --- ### 3. Part Number Breakdown The part number follows a standard industry convention: 1. **CSBL:** Series identifier (typically High Current Molded Inductors). 2. **1809:** Case size (roughly 0.18 x 0.09 inches or 5x5mm footprint). 3. **R82:** Inductance value ($0.82$ µH). The "R" acts as a decimal point. 4. **M:** Tolerance code (±20%). --- ### 4. Common Applications * **Voltage Regulator Modules (VRM):** Used in CPUs and GPUs for power delivery. * **DC-DC Converters:** Point-of-Load (POL) converters in laptops and servers. * **Battery Powered Devices:** High efficiency and small size are perfect for mobile electronics. * **Automotive Electronics:** Used in infotainment and ADAS systems due to high temperature stability.