The **M5R64XL-R** is a high-performance, surface-mount power inductor commonly used in DC-DC converters, voltage regulator modules (VRMs), and power management circuits. It belongs to a class of "molded" inductors designed for high current density and low electromagnetic interference (EMI). --- ### 1. Key Technical Specifications | Parameter | typical Value/Description | | :--- | :--- | | **Inductance** | 0.64 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | Extremely Low (typically < 1.0 mΩ) | | **Saturation Current (Isat)** | High (typically 30A - 60A depending on specific series) | | **Operating Temperature** | -40°C to +125°C | | **Construction** | Metal alloy powder / Shielded | --- ### 2. Physical & Material Characteristics * **Core Material:** It uses a metal alloy composite core. Unlike traditional ferrite cores, these do not saturate "sharply," meaning they maintain inductance better as current increases. * **Shielding:** The part is magnetically shielded. This is critical in modern electronics to prevent the inductor's magnetic field from interfering with sensitive nearby components (EMI reduction). * **Form Factor:** The "R" suffix often denotes "RoHS compliant" or a specific tape-and-reel packaging, while the "XL" usually refers to an extended height or footprint category for higher power handling. --- ### 3. Electronic Functionality #### Power Storage and Filtering In a switching power supply, the M5R64XL-R acts as an energy storage device. It stores energy in its magnetic field during the "on" cycle of a transistor and releases it during the "off" cycle to provide a steady output current. #### Low DCR (Direct Current Resistance) Because the internal windings are made of thick copper, the DCR is kept to a minimum. This results in: * **High Efficiency:** Less energy is wasted as heat. * **Thermal Management:** The part stays cooler even under high load. --- ### 4. Common Applications 1. **Motherboards & Servers:** Used in the CPU/GPU VRM phases to handle high current at low voltages. 2. **Point of Load (POL) Converters:** Step-down (Buck) converters for high-end FPGAs and ASICs. 3. **High-Current Power Supplies:** In industrial and telecommunications equipment. --- ### 5. Identification Code Breakdown | Segment | Meaning | | :--- | :--- | | **M** | Often designates the Manufacturer or Material type (Molded). | | **5R64** | Numerical value for Inductance (0.64 µH). | | **XL** | Size code/Power rating (extra-large/high power). | | **R** | RoHS compliant / Tape & Reel packaging. |