The **M8RS-644-R** is a high-performance, shielded power inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the M8RS series, which is specifically designed for high-frequency power conversion and noise suppression in compact electronic environments. --- ### 1. Key Technical Specifications The following table highlights the core electrical characteristics of the M8RS-644-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 640 nH (0.64 µH) | | **Tolerance** | ±20% | | **Rated Current (Irms)** | ~28.0 Amperes (Typical) | | **Saturation Current (Isat)** | ~44.0 Amperes (Typical) | | **DC Resistance (DCR)** | ~0.75 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### 2. Core Features The M8RS-644-R is engineered with specific physical and chemical properties to handle high power density: * **Low DCR (Direct Current Resistance):** By utilizing a flat wire or optimized winding structure, it minimizes power loss due to heat, significantly improving efficiency in DC-DC converters. * **Magnetic Shielding:** The component is enclosed in a magnetic powder or ferrite core, which reduces Electromagnetic Interference (EMI) and prevents magnetic flux from affecting neighboring components. * **Soft Saturation:** The material construction allows for a "soft" saturation curve, meaning the inductance decreases gradually as current increases, rather than dropping off sharply. * **AEC-Q200 Grade:** Many parts in this series are qualified for automotive use, ensuring high reliability under vibration and thermal shock. --- ### 3. Common Applications Due to its high current handling and low profile, the M8RS-644-R is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power delivery for servers and high-end workstations. 2. **Point-of-Load (POL) Converters:** Efficiently stepping down voltage for FPGAs and ASICs. 3. **Automotive Electronics:** Infotainment systems, ADAS sensors, and LED lighting drivers. 4. **Battery Powered Systems:** Where high efficiency is critical to extending battery life. --- ### 4. Footprint and Mounting The M8RS series typically utilizes an **SMD (Surface Mount Device)** package. The "644" in the part number often refers to the specific physical dimensions (approximately 8mm footprint), allowing for automated "pick-and-place" assembly on PCBs.