The **MC1040-R68M1** 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 efficiency and compact footprints. --- ### 1. Technical Specifications The part number follows a standard nomenclature for electronic components. Here are the primary technical characteristics: | Property | Value / Description | | :--- | :--- | | **Inductance** | 0.68 µH (Microhenries) | | **Tolerance** | ±20% (indicated by the 'M' suffix) | | **Case Size** | 1040 (approx. 10mm x 10mm x 4mm) | | **Core Material** | Metal Alloy / Carbonyl Powder (Molded) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 2. Breakdown of the Part Number * **MC**: Often refers to the series (Molded Chip or Manufacturer specific code). * **1040**: Dimensions. The "10" usually refers to a 10mm length/width, and "40" refers to a 4.0mm height profile. * **R68**: The Inductance value. The 'R' acts as a decimal point ($0.68$). * **M**: The tolerance code ($M = \pm20\%$). --- ### 3. Key Features & Construction * **Molded Construction:** Unlike traditional wire-wound inductors with an open core, these are pressed from metallic powder. This eliminates "acoustic noise" (buzzing) and provides superior structural integrity. * **High Saturation Current ($I_{sat}$):** Because of the iron powder core, the inductor can handle high peak currents without the inductance dropping sharply. * **Low DCR (DC Resistance):** Designed with thick copper wire to minimize power loss through heat, making it ideal for high-efficiency power supplies. * **Low EMI:** The molded body acts as a natural magnetic shield, reducing electromagnetic interference with surrounding components. --- ### 4. Common Applications These inductors are typically found in power management stages for: 1. **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power delivery on motherboards. 2. **DC-DC Converters:** Buck, Boost, or Buck-Boost converters in automotive and industrial electronics. 3. **Battery Powered Devices:** High-efficiency handheld electronics where space and thermal management are critical. ---