The **MF1303T-R56** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to a class of molded power inductors designed for high density and high efficiency. --- ### 1. Key Technical Specifications Below is a breakdown of the typical electronic characteristics for the R56 variant of this series: | Parameter | Specification (Typical) | | :--- | :--- | | **Inductance** | 0.56 µH (Microhenries) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~1.6 mΩ to 2.2 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | ~25A to 32A | | **Heating Current ($I_{rms}$)** | ~20A to 25A | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | ~13.5 x 12.5 x 3.0 mm (1303 Series) | --- ### 2. Core Components and Construction The "MF" series usually denotes a **Metal Composite** construction. This involves specific materials and engineering choices: * **Magnetic Powder Core:** Instead of a traditional ferrite core, it uses a metallic iron powder. This allows for "soft saturation," meaning the inductance drops gradually as current increases rather than crashing abruptly. * **Molded Structure:** The wire coil is placed inside a mold, and the metal powder is pressed around it. This creates a shielded design that minimizes Electromagnetic Interference (EMI) and acoustic noise (buzzing). * **Flat Wire Technology:** Many inductors in this class use flat copper wire to maximize the cross-sectional area, which significantly lowers the DC Resistance (DCR) and reduces heat generation. --- ### 3. Application Use Cases Due to its high current handling and low profile, the MF1303T-R56 is found in: 1. **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs in laptops and servers. 2. **Point of Load (POL) Converters:** Step-down (Buck) converters for high-speed FPGA or ASIC chips. 3. **Battery Management Systems:** High-efficiency power paths in portable electronics. --- ### 4. Part Number Breakdown (Typical) `MF` `1303` `T` - `R56` * **MF:** Series Code (Metal Flux/Metal Composite). * **1303:** Physical dimensions (roughly 13mm x 13mm base, 3mm height). * **T:** Packaging type (usually Tape & Reel). * **R56:** Inductance value (R represents the decimal point: 0.56 µH).