The **SRP1250-R22M** is a high-current, shielded power inductor manufactured by **Bourns**. It is widely used in DC/DC converters and power supplies for its high efficiency and compact footprint. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.22 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 43 A | | **Saturation Current (Isat)** | 80 A | | **DC Resistance (DCR)** | 0.96 mΩ (Max) | | **Operating Temperature** | -40°C to +150°C | | **Dimensions (L x W x H)** | 13.5 x 12.5 x 4.8 mm | --- ### 2. Physical and Structural Parts The component is engineered with specific materials to handle high power density: * **Carbonyl Iron Powder Core:** The inductor utilizes a metal alloy powder core. This material provides high saturation flux density, allowing the part to handle massive current spikes without the inductance dropping off sharply. * **Enameled Copper Wire:** A heavy-gauge copper winding is used inside to minimize DC resistance (DCR), which reduces heat generation and improves efficiency. * **Magnetic Shielding:** The molded construction acts as a natural shield. This minimizes Electromagnetic Interference (EMI) that could affect neighboring components on the PCB. * **Lead-Frame Terminals:** The wide metal terminals on the bottom are designed for surface mount (SMD) soldering, providing a robust mechanical connection and a low-resistance path for high current. --- ### 3. Application Areas Due to its high saturation current and low DCR, this part is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Used in CPU and GPU power delivery. 2. **DC/DC Converters:** Buck, boost, and SEPIC converters. 3. **Industrial Electronics:** High-current power supplies for automation. 4. **Automotive Systems:** (Note: Check for AEC-Q200 qualification if using in automotive grade). --- ### 4. Comparison: R22M vs. Higher Inductance Choosing the **R22M (0.22 µH)** version specifically indicates a design focus on **high switching frequencies** and **maximum current output**, as lower inductance allows for faster transient response but requires a higher switching frequency to keep ripple current low.