The **CSBX1250-R19M** is a high-current, shielded power inductor typically used in DC-DC converters, voltage regulator modules (VRMs), and high-efficiency power supplies. This component is designed to manage high energy density while minimizing electromagnetic interference (EMI). --- ### 1. Key Technical Specifications Based on the standard nomenclature for this series of power inductors, the electronic characteristics are generally as follows: | Parameter | Typical Value | Description | |:---|:---|:---| | **Inductance** | 19 $\mu$H | The nominal inductance at 0A. | | **Tolerance** | ±20% (M) | The allowable deviation from the nominal inductance. | | **Case Size** | 1250 | Refers to dimensions (approx. 12.5mm x 12.5mm x 5.0mm). | | **DCR (DC Resistance)** | Low (mΩ range) | Minimizes power loss and heat generation. | | **Saturation Current** | High | The point where inductance drops by a specified percentage (e.g., 30%). | | **Shielding** | Magnetic Shielded | Reduces leakage flux and EMI. | --- ### 2. Physical Construction The "CSBX" series usually employs a **Molded Powder Core** construction. This involves several critical electronic design choices: * **Composite Core Material:** Usually a metallic iron powder mixed with resin. This allows for a "soft" saturation curve (inductance drops gradually rather than abruptly as current increases). * **Integrated Wire-to-Terminal:** The internal copper winding is usually welded or directly connected to the lead frame to ensure a low-resistance path. * **Surface Mount Technology (SMT):** Designed for pick-and-place assembly on PCBs with flat bottom surfaces for stable soldering. --- ### 3. Electronic Behavior and Applications The 19$\mu$H value suggests this part is intended for filtering or energy storage in medium-frequency power circuits. #### Typical Use Cases: 1. **Buck/Boost Converters:** Used as the energy storage element to smooth out current ripples. 2. **Noise Filtering:** Acting as a low-pass filter in power lines to prevent high-frequency noise from reaching sensitive components. 3. **Battery Powered Devices:** High efficiency (low DCR) helps extend battery life by reducing thermal dissipation. #### Performance Graphs to Consider: * **Inductance vs. Current:** Look for how the 19$\mu$H value stays stable as you approach the rated current. * **Temperature Rise vs. Current:** Check the "Heat Rating Current" ($I_{rms}$) to ensure the component does not exceed 125°C or 150°C during operation. --- ### 4. Part Number Breakdown The nomenclature can be interpreted as follows: * **CSBX**: Series series code (Molded Power Inductor). * **1250**: Physical size (12.5mm x 12.5mm, 5.0mm height). * **R19**: Inductance value (Note: Verify if "R19" represents 0.19$\mu$H or if "19M" represents 19$\mu$H; usually, "R" indicates a decimal point for lower values, while "190" or "19M" denotes higher values). * **M**: Tolerance (±20%).