The **SRP1270-R68M** is a high-current, shielded power inductor manufactured by Bourns. It is part of the SRP1270 series, widely used in automotive and industrial power electronics due to its ability to handle high peak currents and its robust construction. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% (indicated by the 'M') | | **Inductance Code** | R68 (R denotes the decimal point) | | **Case Size** | 1270 (approx. 13.5 x 12.5 x 7.0 mm) | | **Irms (Heating Current)** | ~32 Amperes | | **Isat (Saturation Current)** | ~55 Amperes | | **DCR (DC Resistance)** | ~1.5 mΩ (typical) | | **Operating Temp** | -40°C to +150°C | --- ## 2. Key Electronic Features ### A. Magnetic Shielding The inductor is constructed using a carbonyl iron powder core. This provides a **shielded construction**, which results in low magnetic radiation (low EMI). This is critical for densely packed PCBs where components are sensitive to noise. ### B. High Saturation Current ($I_{sat}$) The core material allows for a "soft" saturation characteristic. Unlike ferrite cores that drop inductance sharply when current limits are reached, the SRP1270-R68M maintains a more stable inductance curve under high-load transients. ### C. Low DCR (DC Resistance) With a resistance of only ~1.5 milliohms, the part minimizes power loss through heat ($P = I^2R$). This makes it highly efficient for high-current DC-DC converters. --- ## 3. Applications Due to its high power density, the SRP1270-R68M is typically found in: * **DC/DC Converters:** Used in point-of-load (POL) power supplies for CPUs and GPUs. * **Automotive Electronics:** Powering infotainment systems and ADAS modules (AEC-Q200 versions available). * **Power Supplies:** Found in distributed power systems and high-current workstations. --- ## 4. Land Pattern (Footprint) *Dimensions are in mm.* | Feature | Dimension | | :--- | :--- | | **Length (L)** | 13.5 ± 0.5 | | **Width (W)** | 12.5 ± 0.3 | | **Height (H)** | 7.0 (Max) | ---