The **MA7HFBX-R** is a high-performance, industrial-grade power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **MPI4040 series** of high-frequency, miniature power inductors. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Technical Specifications The part number follows a specific nomenclature. The "MA" indicates high-current capability, while the "7" usually refers to the inductance value. | Parameter | Value | | :--- | :--- | | **Inductance** | 0.70 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~9.0 Amperes (Typical) | | **Saturation Current (Isat)** | ~14.0 Amperes (Typical) | | **DC Resistance (DCR)** | ~7.2 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 4.0 x 4.0 x 2.0 mm (approx.) | --- ### 2. Key Features and Materials The MA7HFBX-R is designed for modern, high-density power electronic circuits. * **Molded Construction:** It uses a metal composite powder core. This provides "soft saturation" characteristics, meaning the inductance drops gradually as current increases rather than crashing abruptly. * **High Frequency Performance:** Specifically optimized for DC-DC converters operating at high switching frequencies (up to several MHz). * **Low EMI:** The shielded construction ensures that magnetic flux is contained within the body, reducing electromagnetic interference with surrounding components. * **Ruggedness:** It is halogen-free and RoHS compliant, designed to withstand high-vibration industrial environments. --- ### 3. Common Applications Due to its high current density and small footprint, it is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Used in laptops and servers. 2. **Point-of-Load (POL) Converters:** Providing stable power to CPUs, GPUs, and FPGAs. 3. **Battery Powered Devices:** Handheld terminals and tablets where space is at a premium. 4. **Distributed Power Systems:** Converting 12V or 5V rails down to 1.xV logic levels. --- ### 4. Comparison Table: MA7 vs. Standard Inductors | Feature | MA7HFBX-R (Composite) | Standard Ferrite Inductor | | :--- | :--- | :--- | | **Saturation** | Soft (Gradual) | Hard (Abrupt) | | **Acoustic Noise** | Very Low | Can "whine" under load | | **Footprint** | Extremely Compact | Larger for same current | | **EMI Shielding** | Excellent | Varies (often unshielded) |